Fix rear-face image-only labels, click-to-add units, cable concept devices

- Fix "images only" leaving plain labels visible on faces where a
  device has no image for that side (e.g. no rear_image set): the
  view selector now hides every plain label outright in that mode,
  not just the ones an image happens to sit on top of.
- Remove the "Add planned device" button from the elevation card.
  Empty units are now click targets themselves - clicking one opens
  the add-device form pre-filled with that position and face, exactly
  like a real rack's elevation. Occupancy is computed per unit per
  face from the existing device blocks.
- Add cabling for concept devices: ConceptComponent (interfaces,
  front/rear ports, power ports/outlets, console ports) and
  ConceptCable (a connection between two components, restricted to
  devices in the same concept). components.sync_components()
  populates a device's components from its device type's templates,
  including the front/rear port pass-through mapping copied from
  DeviceType.port_mappings - so a device with front/rear port
  templates (a patch panel being the common case) behaves exactly
  like a real one, without hardcoding anything role-specific.
  Placeholder devices without a device type get components added by
  hand. Full CRUD views, tables, filtersets, API endpoints and a
  "Connect" action wired in from the device detail page.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

README.md

@@ -32,9 +32,41 @@ Dazu:
   Teilbreiten-Feature von `netbox_utilities`.
 * **Mandant und Mandantengruppe** an Konzept und an jedem geplanten Gerät.
 * **Platzhalter ohne Gerätetyp** – reservierter Bauraum, nur mit Höhenangabe.
+* **Klick auf eine leere HE** öffnet direkt „Add planned device", vorausgefüllt mit
+  Position und Seite — genau wie bei einer echten Rack-Elevation. Den separaten
+  „Add planned device"-Knopf gibt es dafür nicht mehr.
+* **Verkabelung von Konzept-Geräten** – Interfaces, Front-/Rear-Ports, Power-Ports/
+  -Outlets und Console-Ports lassen sich mit „Sync components" aus dem Gerätetyp
+  übernehmen (inkl. Front-↔Rear-Zuordnung von Patchpanels, 1:1 wie beim echten
+  Gerätetyp) und über „Connect" mit einem Concept Cable verbinden. Platzhalter ohne
+  Gerätetyp bekommen ihre Komponenten per Hand über „Add component".
 * Vollständige REST-API, Filter, CSV-Import/-Export, Bulk-Edit, Changelog, Journal,
   Tags, Custom Fields und globale Suche — wie bei jedem Core-Objekt.
 
+## Verkabelung
+
+Konzept-Geräte lassen sich verkabeln, aber **nicht** über NetBox' echtes `dcim.Cable` —
+das kann nur echte `dcim`-Komponenten verbinden. Stattdessen bringt das Plugin ein
+eigenes, schlankes Modellpaar mit:
+
+* **ConceptComponent** — ein Interface, Front-/Rear-Port, Power-Port/-Outlet oder
+  Console-Port an einem geplanten Gerät. Über **„Sync components"** auf der
+  Geräte-Seite werden sie 1:1 aus den Component-Templates des Gerätetyps erzeugt
+  (Name, Label, Typ, Positionen) — wiederholbar, ohne Duplikate oder Datenverlust an
+  bereits verkabelten Komponenten. Ein Gerät ohne Gerätetyp (Platzhalter) hat keine
+  Templates zum Syncen; seine Komponenten legt man über **„Add component"** von Hand an.
+* **ConceptCable** — verbindet zwei `ConceptComponent`s. Beide Enden müssen zu Geräten
+  im selben Rack-Konzept gehören; eine Komponente kann nur in einem Kabel gleichzeitig
+  stecken. Erreichbar über **„Connect"** an jeder unverkabelten Komponente.
+
+**Patchpanels funktionieren genauso wie bei echten Geräten**, weil das Plugin exakt
+dieselbe Front-↔Rear-Zuordnung ausliest, die NetBox selbst am Gerätetyp pflegt (über
+`PortTemplateMapping`, dieselbe Tabelle, die auch echte `FrontPort`/`RearPort`-Objekte
+verknüpft). Das hängt also nicht an der Rollenbezeichnung „Patchpanel", sondern schlicht
+daran, ob der Gerätetyp Front-/Rear-Ports mit Zuordnung definiert — Kabel an der
+Vorderseite eines synchronisierten Patchpanel-Gerätetyps zeigen auf der Detailseite der
+Komponente sofort den passenden Rear-Port samt Position an.
+
 ## Zusammenspiel mit den anderen Plugins
 
 **netbox-reorder-rack (rackorder)** arbeitet auf `dcim.Device`-Querysets. Ein Konzept hat
@@ -172,6 +204,8 @@ Basis-Pfad: `/api/plugins/rack-concepts/`
 | `POST` | `concepts/{id}/deploy/` | Konzept ausrollen (`dry_run` möglich) |
 | `GET` | `concepts/{id}/elevation/` | Berechnete Elevation als JSON |
 | `GET/POST` | `devices/` | Geplante Geräte |
+| `GET/POST` | `components/` | Komponenten der geplanten Geräte |
+| `GET/POST` | `cables/` | Concept Cables |
 
 Beispiel — zehn Racks aus einem Konzept, erst als Trockenlauf:
 

netbox_rack_concept/api/serializers.py

@@ -11,9 +11,11 @@ from tenancy.api.serializers import TenantGroupSerializer, TenantSerializer
 from tenancy.models import Tenant
 
 from ..choices import ConceptStatusChoices
-from ..models import ConceptDeployment, ConceptDevice, RackConcept
+from ..models import ConceptCable, ConceptComponent, ConceptDeployment, ConceptDevice, RackConcept
 
 __all__ = (
+    'ConceptCableSerializer',
+    'ConceptComponentSerializer',
     'ConceptDeploySerializer',
     'ConceptDeploymentSerializer',
     'ConceptDeviceSerializer',
@@ -81,6 +83,38 @@ class ConceptDeploymentSerializer(serializers.ModelSerializer):
         fields = ('id', 'rack', 'rack_name', 'device_count', 'user', 'created')
 
 
+class ConceptComponentSerializer(NetBoxModelSerializer):
+    url = serializers.HyperlinkedIdentityField(
+        view_name='plugins-api:netbox_rack_concept-api:conceptcomponent-detail'
+    )
+    device = ConceptDeviceSerializer(nested=True)
+    is_connected = serializers.BooleanField(read_only=True)
+
+    class Meta:
+        model = ConceptComponent
+        fields = (
+            'id', 'url', 'display_url', 'display', 'device', 'component_type', 'name', 'label', 'port_type',
+            'positions', 'color', 'description', 'is_connected', 'tags', 'custom_fields', 'created', 'last_updated',
+        )
+        brief_fields = ('id', 'url', 'display', 'name', 'component_type', 'device')
+
+
+class ConceptCableSerializer(NetBoxModelSerializer):
+    url = serializers.HyperlinkedIdentityField(
+        view_name='plugins-api:netbox_rack_concept-api:conceptcable-detail'
+    )
+    termination_a = ConceptComponentSerializer(nested=True)
+    termination_b = ConceptComponentSerializer(nested=True)
+
+    class Meta:
+        model = ConceptCable
+        fields = (
+            'id', 'url', 'display_url', 'display', 'termination_a', 'termination_b', 'status', 'type', 'color',
+            'label', 'description', 'comments', 'tags', 'custom_fields', 'created', 'last_updated',
+        )
+        brief_fields = ('id', 'url', 'display', 'label', 'termination_a', 'termination_b')
+
+
 #
 # Action payloads
 #

netbox_rack_concept/api/urls.py

@@ -7,5 +7,7 @@ app_name = 'netbox_rack_concept-api'
 router = NetBoxRouter()
 router.register('concepts', views.RackConceptViewSet)
 router.register('devices', views.ConceptDeviceViewSet)
+router.register('components', views.ConceptComponentViewSet)
+router.register('cables', views.ConceptCableViewSet)
 
 urlpatterns = router.urls

netbox_rack_concept/api/views.py

@@ -11,10 +11,10 @@ from netbox.api.viewsets import NetBoxModelViewSet
 from .. import filtersets
 from .. import deploy as deploy_utils
 from ..elevation import get_elevations
-from ..models import ConceptDevice, RackConcept
+from ..models import ConceptCable, ConceptComponent, ConceptDevice, RackConcept
 from .serializers import (
-    ConceptDeploySerializer, ConceptDeviceSerializer, MergeConceptsSerializer, RackConceptCloneSerializer,
+    ConceptCableSerializer, ConceptComponentSerializer, ConceptDeploySerializer, ConceptDeviceSerializer,
-    RackConceptSerializer, RackCopySerializer,
+    MergeConceptsSerializer, RackConceptCloneSerializer, RackConceptSerializer, RackCopySerializer,
 )
 
 __all__ = (
@@ -204,3 +204,17 @@ class ConceptDeviceViewSet(NetBoxModelViewSet):
     )
     serializer_class = ConceptDeviceSerializer
     filterset_class = filtersets.ConceptDeviceFilterSet
+
+
+class ConceptComponentViewSet(NetBoxModelViewSet):
+    queryset = ConceptComponent.objects.prefetch_related('tags').select_related('device', 'device__concept')
+    serializer_class = ConceptComponentSerializer
+    filterset_class = filtersets.ConceptComponentFilterSet
+
+
+class ConceptCableViewSet(NetBoxModelViewSet):
+    queryset = ConceptCable.objects.prefetch_related('tags').select_related(
+        'termination_a', 'termination_a__device', 'termination_b', 'termination_b__device'
+    )
+    serializer_class = ConceptCableSerializer
+    filterset_class = filtersets.ConceptCableFilterSet

netbox_rack_concept/choices.py

@@ -59,3 +59,32 @@ class WidthFractionChoices(ChoiceSet):
 # Least common multiple of all supported denominators. The elevation is laid out
 # on this many lanes so that every fraction lands on an integer lane boundary.
 LANE_COUNT = 12
+
+
+class ConceptComponentTypeChoices(ChoiceSet):
+    """
+    The kinds of pluggable component a planned device can carry. One shared model
+    covers all of them (see ConceptComponent) rather than mirroring dcim's seven
+    separate component models - a blueprint only needs enough detail to say what a
+    cable plugs into, not full per-type validation.
+    """
+    TYPE_INTERFACE = 'interface'
+    TYPE_FRONT_PORT = 'front-port'
+    TYPE_REAR_PORT = 'rear-port'
+    TYPE_CONSOLE_PORT = 'console-port'
+    TYPE_CONSOLE_SERVER_PORT = 'console-server-port'
+    TYPE_POWER_PORT = 'power-port'
+    TYPE_POWER_OUTLET = 'power-outlet'
+
+    CHOICES = [
+        (TYPE_INTERFACE, 'Interface', 'blue'),
+        (TYPE_FRONT_PORT, 'Front port', 'orange'),
+        (TYPE_REAR_PORT, 'Rear port', 'yellow'),
+        (TYPE_CONSOLE_PORT, 'Console port', 'teal'),
+        (TYPE_CONSOLE_SERVER_PORT, 'Console server port', 'cyan'),
+        (TYPE_POWER_PORT, 'Power port', 'red'),
+        (TYPE_POWER_OUTLET, 'Power outlet', 'pink'),
+    ]
+
+    #: Component types that are pass-through ports and can appear in a ConceptPortMapping.
+    PATCH_TYPES = (TYPE_FRONT_PORT, TYPE_REAR_PORT)

netbox_rack_concept/components.py

@@ -0,0 +1,79 @@
+"""
+Populate a planned device's components from its device type's templates - interfaces,
+ports, and the front/rear pass-through mapping - so a concept device with a device type
+can be cabled exactly like a real one. A device type's own component templates are the
+single source of truth here; nothing about this is specific to any particular role, so
+a "Patchpanel"-role device gets correct front/rear pass-through behaviour simply because
+that's what its device type's templates already describe - the same as a real device.
+
+Placeholder devices without a device type have no templates to sync from; their
+components, if any, have to be added by hand.
+"""
+from django.db import transaction
+
+from .choices import ConceptComponentTypeChoices
+from .models import ConceptComponent, ConceptPortMapping
+
+__all__ = ('sync_components',)
+
+# (our component type, DeviceType's reverse accessor for that template queryset)
+TEMPLATE_SOURCES = (
+    (ConceptComponentTypeChoices.TYPE_INTERFACE, 'interfacetemplates'),
+    (ConceptComponentTypeChoices.TYPE_CONSOLE_PORT, 'consoleporttemplates'),
+    (ConceptComponentTypeChoices.TYPE_CONSOLE_SERVER_PORT, 'consoleserverporttemplates'),
+    (ConceptComponentTypeChoices.TYPE_POWER_PORT, 'powerporttemplates'),
+    (ConceptComponentTypeChoices.TYPE_POWER_OUTLET, 'poweroutlettemplates'),
+    (ConceptComponentTypeChoices.TYPE_FRONT_PORT, 'frontporttemplates'),
+    (ConceptComponentTypeChoices.TYPE_REAR_PORT, 'rearporttemplates'),
+)
+
+
+@transaction.atomic
+def sync_components(concept_device):
+    """
+    Create whichever of the device type's components don't already exist on this
+    device (matched by name), and mirror its front/rear port mapping. Existing
+    components - and any cables already attached to them - are left untouched, so this
+    is safe to re-run after adding extra components by hand or after the device type
+    changes. Returns (components_created, mappings_created).
+    """
+    device_type = concept_device.device_type
+    if device_type is None:
+        return 0, 0
+
+    existing = {component.name: component for component in concept_device.components.all()}
+    created = 0
+
+    for component_type, accessor in TEMPLATE_SOURCES:
+        for template in getattr(device_type, accessor).all():
+            if template.name in existing:
+                continue
+            component = ConceptComponent.objects.create(
+                device=concept_device,
+                component_type=component_type,
+                name=template.name,
+                label=template.label,
+                port_type=getattr(template, 'type', '') or '',
+                positions=getattr(template, 'positions', 1) or 1,
+                color=getattr(template, 'color', '') or '',
+            )
+            existing[component.name] = component
+            created += 1
+
+    mappings_created = 0
+    for mapping in device_type.port_mappings.select_related('front_port', 'rear_port').all():
+        front = existing.get(mapping.front_port.name)
+        rear = existing.get(mapping.rear_port.name)
+        if not (front and rear):
+            # Shouldn't happen - the templates were just synced above - but a
+            # partially-synced device from before a device type change could hit this.
+            continue
+        _, was_created = ConceptPortMapping.objects.get_or_create(
+            front_component=front,
+            front_position=mapping.front_port_position,
+            defaults={'rear_component': rear, 'rear_position': mapping.rear_port_position}
+        )
+        if was_created:
+            mappings_created += 1
+
+    return created, mappings_created

netbox_rack_concept/elevation.py

@@ -38,10 +38,15 @@ def foreground_color(bg_color):
 class ElevationUnit:
     """One labelled rack unit row."""
 
-    def __init__(self, number, y):
+    def __init__(self, number, y, occupied=False):
         self.number = number
         self.y = y
         self.height = UNIT_HEIGHT
+        # Whether *anything* renders over this unit on this face - including a
+        # reduced-opacity "opposite" block for a full-depth device. A unit only counts
+        # as free (and thus click-to-add) when nothing at all sits on it, which folds
+        # back to plain occupied/free for full-width-only setups, same as core NetBox.
+        self.occupied = occupied
 
 
 class ElevationBlock:
@@ -110,11 +115,14 @@ class Elevation:
         self.legend_width = LEGEND_WIDTH
         self.rack_width = RACK_WIDTH
         self.rack_x = RACK_X
+        self.rack_right = RACK_X + RACK_WIDTH
         self.width = RACK_X + RACK_WIDTH + MARGIN
         self.height = concept.u_height * UNIT_HEIGHT + MARGIN * 2
 
-        self._build_units()
+        # Blocks first: unit occupancy (used to decide which units are click-to-add)
+        # depends on where they land.
         self._build_blocks(devices if devices is not None else concept.devices.all())
+        self._build_units()
 
     @property
     def face_label(self):
@@ -134,7 +142,11 @@ class Elevation:
     def _build_units(self):
         for number in self.concept.units:
             top = number if self.concept.desc_units else number + 1
-            self.units.append(ElevationUnit(number, self._y_for(Decimal(top))))
+            occupied = any(
+                block.device.unit_span and block.device.unit_span[0] <= number < block.device.unit_span[1]
+                for block in self.blocks
+            )
+            self.units.append(ElevationUnit(number, self._y_for(Decimal(top)), occupied))
 
     def _build_blocks(self, devices):
         for device in devices:

netbox_rack_concept/filtersets.py

@@ -2,14 +2,17 @@ import django_filters
 from django.db.models import Q
 from django.utils.translation import gettext_lazy as _
 
+from dcim.choices import CableTypeChoices, LinkStatusChoices
 from dcim.models import DeviceRole, DeviceType, Rack, RackType, Site
 from netbox.filtersets import NetBoxModelFilterSet
 from tenancy.models import Tenant, TenantGroup
 
-from .choices import ConceptDeviceStatusChoices, ConceptStatusChoices
+from .choices import ConceptComponentTypeChoices, ConceptDeviceStatusChoices, ConceptStatusChoices
-from .models import ConceptDevice, RackConcept
+from .models import ConceptCable, ConceptComponent, ConceptDevice, RackConcept
 
 __all__ = (
+    'ConceptCableFilterSet',
+    'ConceptComponentFilterSet',
     'ConceptDeviceFilterSet',
     'RackConceptFilterSet',
 )
@@ -115,3 +118,71 @@ class ConceptDeviceFilterSet(NetBoxModelFilterSet):
 
     def filter_racked(self, queryset, name, value):
         return queryset.filter(position__isnull=not value)
+
+
+class ConceptComponentFilterSet(NetBoxModelFilterSet):
+    device_id = django_filters.ModelMultipleChoiceFilter(
+        queryset=ConceptDevice.objects.all(),
+        label=_('Concept device (ID)')
+    )
+    concept_id = django_filters.ModelMultipleChoiceFilter(
+        field_name='device__concept',
+        queryset=RackConcept.objects.all(),
+        label=_('Rack concept (ID)')
+    )
+    component_type = django_filters.MultipleChoiceFilter(
+        choices=ConceptComponentTypeChoices
+    )
+    connected = django_filters.BooleanFilter(
+        method='filter_connected',
+        label=_('Has a cable attached')
+    )
+
+    class Meta:
+        model = ConceptComponent
+        fields = ('id', 'name', 'label', 'component_type', 'port_type', 'positions', 'description')
+
+    def search(self, queryset, name, value):
+        if not value.strip():
+            return queryset
+        return queryset.filter(
+            Q(name__icontains=value) |
+            Q(label__icontains=value) |
+            Q(description__icontains=value)
+        )
+
+    def filter_connected(self, queryset, name, value):
+        # A component is connected once it's referenced by a cable as either end.
+        connected = (
+            Q(pk__in=ConceptCable.objects.values_list('termination_a_id', flat=True)) |
+            Q(pk__in=ConceptCable.objects.values_list('termination_b_id', flat=True))
+        )
+        return queryset.filter(connected) if value else queryset.exclude(connected)
+
+
+class ConceptCableFilterSet(NetBoxModelFilterSet):
+    concept_id = django_filters.ModelMultipleChoiceFilter(
+        field_name='termination_a__device__concept',
+        queryset=RackConcept.objects.all(),
+        label=_('Rack concept (ID)')
+    )
+    status = django_filters.MultipleChoiceFilter(
+        choices=LinkStatusChoices
+    )
+    type = django_filters.MultipleChoiceFilter(
+        choices=CableTypeChoices
+    )
+
+    class Meta:
+        model = ConceptCable
+        fields = ('id', 'status', 'type', 'color', 'label', 'description')
+
+    def search(self, queryset, name, value):
+        if not value.strip():
+            return queryset
+        return queryset.filter(
+            Q(label__icontains=value) |
+            Q(description__icontains=value) |
+            Q(termination_a__name__icontains=value) |
+            Q(termination_b__name__icontains=value)
+        )

netbox_rack_concept/forms.py

@@ -1,7 +1,8 @@
 from django import forms
 from django.utils.translation import gettext_lazy as _
 
-from dcim.choices import DeviceFaceChoices, RackAirflowChoices, RackFormFactorChoices, RackWidthChoices
+from dcim.choices import CableTypeChoices, DeviceFaceChoices, LinkStatusChoices, RackAirflowChoices, \
+    RackFormFactorChoices, RackWidthChoices
 from dcim.models import DeviceRole, DeviceType, Location, Platform, Rack, RackRole, RackType, Site
 from netbox.forms import NetBoxModelBulkEditForm, NetBoxModelFilterSetForm, NetBoxModelForm, NetBoxModelImportForm
 from tenancy.models import Tenant, TenantGroup
@@ -12,10 +13,15 @@ from utilities.forms.fields import (
 from utilities.forms.rendering import FieldSet
 from utilities.forms.widgets import BulkEditNullBooleanSelect
 
-from .choices import ConceptDeviceStatusChoices, ConceptStatusChoices, WidthFractionChoices
+from .choices import ConceptComponentTypeChoices, ConceptDeviceStatusChoices, ConceptStatusChoices, \
-from .models import ConceptDevice, RackConcept
+    WidthFractionChoices
+from .models import ConceptCable, ConceptComponent, ConceptDevice, RackConcept
 
 __all__ = (
+    'ConceptCableForm',
+    'ConceptCableFilterForm',
+    'ConceptComponentForm',
+    'ConceptComponentFilterForm',
     'ConceptDeployForm',
     'ConceptDeviceBulkEditForm',
     'ConceptDeviceFilterForm',
@@ -631,3 +637,125 @@ class ConceptDeployForm(forms.Form):
             })
         cleaned['rack_names'] = names
         return cleaned
+
+
+#
+# Cabling
+#
+
+class ConceptComponentForm(NetBoxModelForm):
+    device = DynamicModelChoiceField(
+        queryset=ConceptDevice.objects.all(),
+        label=_('Concept device')
+    )
+
+    fieldsets = (
+        FieldSet('device', 'component_type', 'name', 'label', 'description', 'tags', name=_('Component')),
+        FieldSet('port_type', 'positions', 'color', name=_('Attributes')),
+    )
+
+    class Meta:
+        model = ConceptComponent
+        fields = (
+            'device', 'component_type', 'name', 'label', 'port_type', 'positions', 'color', 'description', 'tags',
+        )
+
+
+class ConceptComponentFilterForm(NetBoxModelFilterSetForm):
+    model = ConceptComponent
+
+    device_id = DynamicModelMultipleChoiceField(
+        queryset=ConceptDevice.objects.all(),
+        required=False,
+        label=_('Concept device')
+    )
+    concept_id = DynamicModelMultipleChoiceField(
+        queryset=RackConcept.objects.all(),
+        required=False,
+        label=_('Rack concept')
+    )
+    component_type = forms.MultipleChoiceField(choices=ConceptComponentTypeChoices, required=False)
+    connected = forms.NullBooleanField(required=False, widget=forms.Select(choices=(
+        ('', '---------'), ('true', _('Connected')), ('false', _('Not connected')),
+    )))
+    tag = TagFilterField(model)
+
+    fieldsets = (
+        FieldSet('q', 'filter_id', 'tag'),
+        FieldSet('device_id', 'concept_id', 'component_type', 'connected', name=_('Attributes')),
+    )
+
+
+class ConceptCableForm(NetBoxModelForm):
+    """
+    Mirrors the shape of NetBox's own cable-connect form: pick a device, then a
+    component on it, for each end.
+    """
+    concept = DynamicModelChoiceField(
+        queryset=RackConcept.objects.all(),
+        label=_('Rack concept'),
+        help_text=_('Both ends must belong to devices in this concept')
+    )
+    termination_a_device = DynamicModelChoiceField(
+        queryset=ConceptDevice.objects.all(),
+        label=_('Device A'),
+        query_params={'concept_id': '$concept'}
+    )
+    termination_a = DynamicModelChoiceField(
+        queryset=ConceptComponent.objects.all(),
+        label=_('Component A'),
+        query_params={'device_id': '$termination_a_device', 'connected': 'false'}
+    )
+    termination_b_device = DynamicModelChoiceField(
+        queryset=ConceptDevice.objects.all(),
+        label=_('Device B'),
+        query_params={'concept_id': '$concept'}
+    )
+    termination_b = DynamicModelChoiceField(
+        queryset=ConceptComponent.objects.all(),
+        label=_('Component B'),
+        query_params={'device_id': '$termination_b_device', 'connected': 'false'}
+    )
+    comments = CommentField()
+
+    fieldsets = (
+        FieldSet('concept', name=_('Scope')),
+        FieldSet('termination_a_device', 'termination_a', name=_('Side A')),
+        FieldSet('termination_b_device', 'termination_b', name=_('Side B')),
+        FieldSet('status', 'type', 'color', 'label', 'description', 'tags', name=_('Cable')),
+    )
+
+    class Meta:
+        model = ConceptCable
+        fields = (
+            'termination_a', 'termination_b', 'status', 'type', 'color', 'label', 'description', 'comments', 'tags',
+        )
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        # concept/termination_*_device are UI-only helpers for the cascading selects
+        # above, not model fields - when editing an existing cable, seed them from the
+        # components already chosen so the dropdowns show the right device on load.
+        instance = self.instance
+        if instance and instance.pk:
+            self.fields['concept'].initial = instance.termination_a.device.concept_id
+            self.fields['termination_a_device'].initial = instance.termination_a.device_id
+            self.fields['termination_b_device'].initial = instance.termination_b.device_id
+
+
+class ConceptCableFilterForm(NetBoxModelFilterSetForm):
+    model = ConceptCable
+
+    concept_id = DynamicModelMultipleChoiceField(
+        queryset=RackConcept.objects.all(),
+        required=False,
+        label=_('Rack concept')
+    )
+    status = forms.MultipleChoiceField(choices=LinkStatusChoices, required=False)
+    type = forms.MultipleChoiceField(choices=CableTypeChoices, required=False)
+    tag = TagFilterField(model)
+
+    fieldsets = (
+        FieldSet('q', 'filter_id', 'tag'),
+        FieldSet('concept_id', 'status', 'type', name=_('Attributes')),
+    )

netbox_rack_concept/migrations/0002_cabling.py

@@ -0,0 +1,113 @@
+import django.core.validators
+import django.db.models.deletion
+import taggit.managers
+import utilities.fields
+import utilities.json
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('extras', '__latest__'),
+        ('netbox_rack_concept', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ConceptComponent',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False)),
+                ('created', models.DateTimeField(auto_now_add=True, null=True)),
+                ('last_updated', models.DateTimeField(auto_now=True, null=True)),
+                ('custom_field_data', models.JSONField(
+                    blank=True, default=dict, encoder=utilities.json.CustomFieldJSONEncoder
+                )),
+                ('component_type', models.CharField(max_length=50)),
+                ('name', models.CharField(max_length=64)),
+                ('label', models.CharField(blank=True, max_length=64)),
+                ('port_type', models.CharField(blank=True, max_length=50)),
+                ('positions', models.PositiveSmallIntegerField(default=1, validators=[
+                    django.core.validators.MinValueValidator(1),
+                    django.core.validators.MaxValueValidator(1024),
+                ])),
+                ('color', utilities.fields.ColorField(blank=True)),
+                ('description', models.CharField(blank=True, max_length=200)),
+                ('device', models.ForeignKey(
+                    on_delete=django.db.models.deletion.CASCADE, related_name='components',
+                    to='netbox_rack_concept.conceptdevice'
+                )),
+                ('tags', taggit.managers.TaggableManager(through='extras.TaggedItem', to='extras.Tag')),
+            ],
+            options={
+                'verbose_name': 'concept component',
+                'verbose_name_plural': 'concept components',
+                'ordering': ('device', 'component_type', 'name'),
+            },
+        ),
+        migrations.AddConstraint(
+            model_name='conceptcomponent',
+            constraint=models.UniqueConstraint(fields=('device', 'name'), name='nbrc_component_unique_device_name'),
+        ),
+        migrations.CreateModel(
+            name='ConceptPortMapping',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False)),
+                ('front_position', models.PositiveSmallIntegerField(default=1)),
+                ('rear_position', models.PositiveSmallIntegerField(default=1)),
+                ('front_component', models.ForeignKey(
+                    limit_choices_to={'component_type': 'front-port'},
+                    on_delete=django.db.models.deletion.CASCADE, related_name='front_mappings',
+                    to='netbox_rack_concept.conceptcomponent'
+                )),
+                ('rear_component', models.ForeignKey(
+                    limit_choices_to={'component_type': 'rear-port'},
+                    on_delete=django.db.models.deletion.CASCADE, related_name='rear_mappings',
+                    to='netbox_rack_concept.conceptcomponent'
+                )),
+            ],
+        ),
+        migrations.AddConstraint(
+            model_name='conceptportmapping',
+            constraint=models.UniqueConstraint(
+                fields=('front_component', 'front_position'), name='nbrc_portmapping_unique_front'
+            ),
+        ),
+        migrations.AddConstraint(
+            model_name='conceptportmapping',
+            constraint=models.UniqueConstraint(
+                fields=('rear_component', 'rear_position'), name='nbrc_portmapping_unique_rear'
+            ),
+        ),
+        migrations.CreateModel(
+            name='ConceptCable',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False)),
+                ('created', models.DateTimeField(auto_now_add=True, null=True)),
+                ('last_updated', models.DateTimeField(auto_now=True, null=True)),
+                ('custom_field_data', models.JSONField(
+                    blank=True, default=dict, encoder=utilities.json.CustomFieldJSONEncoder
+                )),
+                ('status', models.CharField(default='connected', max_length=50)),
+                ('type', models.CharField(blank=True, max_length=50)),
+                ('color', utilities.fields.ColorField(blank=True)),
+                ('label', models.CharField(blank=True, max_length=100)),
+                ('description', models.CharField(blank=True, max_length=200)),
+                ('comments', models.TextField(blank=True)),
+                ('termination_a', models.ForeignKey(
+                    on_delete=django.db.models.deletion.CASCADE, related_name='+',
+                    to='netbox_rack_concept.conceptcomponent'
+                )),
+                ('termination_b', models.ForeignKey(
+                    on_delete=django.db.models.deletion.CASCADE, related_name='+',
+                    to='netbox_rack_concept.conceptcomponent'
+                )),
+                ('tags', taggit.managers.TaggableManager(through='extras.TaggedItem', to='extras.Tag')),
+            ],
+            options={
+                'verbose_name': 'concept cable',
+                'verbose_name_plural': 'concept cables',
+                'ordering': ('pk',),
+            },
+        ),
+    ]

netbox_rack_concept/models.py

@@ -7,15 +7,22 @@ from django.urls import reverse
 from django.utils.translation import gettext_lazy as _
 
 from dcim.choices import (
-    DeviceFaceChoices, RackAirflowChoices, RackDimensionUnitChoices, RackFormFactorChoices, RackWidthChoices,
+    CableTypeChoices, DeviceFaceChoices, LinkStatusChoices, RackAirflowChoices, RackDimensionUnitChoices,
+    RackFormFactorChoices, RackWidthChoices,
 )
 from netbox.models import NetBoxModel
+from utilities.fields import ColorField
 
-from .choices import LANE_COUNT, ConceptDeviceStatusChoices, ConceptStatusChoices, WidthFractionChoices
+from .choices import (
+    LANE_COUNT, ConceptComponentTypeChoices, ConceptDeviceStatusChoices, ConceptStatusChoices, WidthFractionChoices,
+)
 
 __all__ = (
+    'ConceptCable',
+    'ConceptComponent',
     'ConceptDevice',
     'ConceptDeployment',
+    'ConceptPortMapping',
     'RackConcept',
 )
 
@@ -459,3 +466,216 @@ class ConceptDeployment(models.Model):
 
     def __str__(self):
         return f'{self.concept} → {self.rack_name}'
+
+
+class ConceptComponent(NetBoxModel):
+    """
+    A pluggable point on a planned device - an interface, a front/rear port, a power
+    port/outlet, or a console port. One shared model covers every kind rather than
+    mirroring dcim's seven separate component models, since a blueprint only needs
+    enough detail to say what a cable plugs into, not full per-type validation.
+
+    Populated either by syncing a device's component templates (see components.py) or
+    added by hand, which is the only option for placeholder devices without a device
+    type.
+    """
+    device = models.ForeignKey(
+        to=ConceptDevice,
+        on_delete=models.CASCADE,
+        related_name='components'
+    )
+    component_type = models.CharField(
+        verbose_name=_('component type'),
+        max_length=50,
+        choices=ConceptComponentTypeChoices
+    )
+    name = models.CharField(
+        verbose_name=_('name'),
+        max_length=64
+    )
+    label = models.CharField(
+        max_length=64,
+        blank=True
+    )
+    port_type = models.CharField(
+        verbose_name=_('type'),
+        max_length=50,
+        blank=True,
+        help_text=_('Free text, e.g. "1000base-t" or "lc" - for reference only, not validated')
+    )
+    positions = models.PositiveSmallIntegerField(
+        verbose_name=_('positions'),
+        default=1,
+        validators=[MinValueValidator(1), MaxValueValidator(1024)],
+        help_text=_('Front/rear ports only')
+    )
+    color = ColorField(blank=True)
+    description = models.CharField(max_length=200, blank=True)
+
+    clone_fields = ('device', 'component_type', 'port_type', 'positions')
+
+    class Meta:
+        ordering = ('device', 'component_type', 'name')
+        constraints = (
+            models.UniqueConstraint(fields=('device', 'name'), name='nbrc_component_unique_device_name'),
+        )
+        verbose_name = _('concept component')
+        verbose_name_plural = _('concept components')
+
+    def __str__(self):
+        return self.name
+
+    def get_absolute_url(self):
+        return reverse('plugins:netbox_rack_concept:conceptcomponent', args=[self.pk])
+
+    @property
+    def is_pass_through(self):
+        return self.component_type in ConceptComponentTypeChoices.PATCH_TYPES
+
+    @property
+    def cable(self):
+        return ConceptCable.objects.filter(
+            models.Q(termination_a=self) | models.Q(termination_b=self)
+        ).first()
+
+    @property
+    def is_connected(self):
+        return self.cable is not None
+
+    def get_paired_components(self):
+        """
+        For a front or rear port, the port(s) on the other side it passes through to -
+        real patch panel behaviour: a signal entering a front port continues out
+        whichever rear port (and position) it's mapped to, and vice versa.
+        Returns a list of (component, own_position, other_position) tuples.
+        """
+        if self.component_type == ConceptComponentTypeChoices.TYPE_FRONT_PORT:
+            return [
+                (mapping.rear_component, mapping.front_position, mapping.rear_position)
+                for mapping in self.front_mappings.select_related('rear_component')
+            ]
+        if self.component_type == ConceptComponentTypeChoices.TYPE_REAR_PORT:
+            return [
+                (mapping.front_component, mapping.rear_position, mapping.front_position)
+                for mapping in self.rear_mappings.select_related('front_component')
+            ]
+        return []
+
+    def clean(self):
+        super().clean()
+        if self.positions > 1 and not self.is_pass_through:
+            raise ValidationError({
+                'positions': _('Only front and rear ports can have more than one position.')
+            })
+
+
+class ConceptPortMapping(models.Model):
+    """
+    Maps a front port position to a rear port position, mirroring dcim's PortMapping.
+    Not a NetBoxModel: like its real-world counterpart, this is wiring metadata, not a
+    user-facing object with its own detail page.
+    """
+    front_component = models.ForeignKey(
+        to=ConceptComponent,
+        on_delete=models.CASCADE,
+        related_name='front_mappings',
+        limit_choices_to={'component_type': ConceptComponentTypeChoices.TYPE_FRONT_PORT}
+    )
+    rear_component = models.ForeignKey(
+        to=ConceptComponent,
+        on_delete=models.CASCADE,
+        related_name='rear_mappings',
+        limit_choices_to={'component_type': ConceptComponentTypeChoices.TYPE_REAR_PORT}
+    )
+    front_position = models.PositiveSmallIntegerField(default=1)
+    rear_position = models.PositiveSmallIntegerField(default=1)
+
+    class Meta:
+        constraints = (
+            models.UniqueConstraint(
+                fields=('front_component', 'front_position'), name='nbrc_portmapping_unique_front'
+            ),
+            models.UniqueConstraint(
+                fields=('rear_component', 'rear_position'), name='nbrc_portmapping_unique_rear'
+            ),
+        )
+
+    def __str__(self):
+        return f'{self.front_component}:{self.front_position} → {self.rear_component}:{self.rear_position}'
+
+    def clean(self):
+        super().clean()
+        if self.front_component_id and self.rear_component_id:
+            if self.front_component.device_id != self.rear_component.device_id:
+                raise ValidationError({
+                    'rear_component': _('Front and rear port must belong to the same device.')
+                })
+
+
+class ConceptCable(NetBoxModel):
+    """A planned connection between two components, on planned devices only."""
+    termination_a = models.ForeignKey(
+        to=ConceptComponent,
+        on_delete=models.CASCADE,
+        related_name='+'
+    )
+    termination_b = models.ForeignKey(
+        to=ConceptComponent,
+        on_delete=models.CASCADE,
+        related_name='+'
+    )
+    status = models.CharField(
+        max_length=50,
+        choices=LinkStatusChoices,
+        default=LinkStatusChoices.STATUS_CONNECTED
+    )
+    type = models.CharField(
+        verbose_name=_('type'),
+        max_length=50,
+        choices=CableTypeChoices,
+        blank=True
+    )
+    color = ColorField(blank=True)
+    label = models.CharField(max_length=100, blank=True)
+    description = models.CharField(max_length=200, blank=True)
+    comments = models.TextField(blank=True)
+
+    clone_fields = ('status', 'type', 'color')
+
+    class Meta:
+        ordering = ('pk',)
+        verbose_name = _('concept cable')
+        verbose_name_plural = _('concept cables')
+
+    def __str__(self):
+        return self.label or f'#{self.pk}'
+
+    def get_absolute_url(self):
+        return reverse('plugins:netbox_rack_concept:conceptcable', args=[self.pk])
+
+    def get_status_color(self):
+        return LinkStatusChoices.colors.get(self.status)
+
+    def clean(self):
+        super().clean()
+        if not (self.termination_a_id and self.termination_b_id):
+            return
+
+        if self.termination_a_id == self.termination_b_id:
+            raise ValidationError(_('A cable cannot connect a component to itself.'))
+
+        if self.termination_a.device.concept_id != self.termination_b.device.concept_id:
+            raise ValidationError(
+                _('Both ends of a cable must belong to devices in the same rack concept.')
+            )
+
+        for field_name, endpoint in (('termination_a', self.termination_a), ('termination_b', self.termination_b)):
+            conflict = ConceptCable.objects.exclude(pk=self.pk).filter(
+                models.Q(termination_a=endpoint) | models.Q(termination_b=endpoint)
+            ).first()
+            if conflict:
+                raise ValidationError({
+                    field_name: _('%(component)s is already connected (%(cable)s).') % {
+                        'component': endpoint, 'cable': conflict
+                    }
+                })

netbox_rack_concept/navigation.py

@@ -44,6 +44,16 @@ device_buttons = [
     ),
 ]
 
+cable_buttons = [
+    PluginMenuButton(
+        link='plugins:netbox_rack_concept:conceptcable_add',
+        title=_('Add'),
+        icon_class='mdi mdi-plus-thick',
+        color=ButtonColorChoices.GREEN,
+        permissions=['netbox_rack_concept.add_conceptcable']
+    ),
+]
+
 menu = PluginMenu(
     label=_('Rack Concepts'),
     icon_class='mdi mdi-view-grid-plus-outline',
@@ -62,5 +72,18 @@ menu = PluginMenu(
                 buttons=device_buttons
             ),
         )),
+        (_('Cabling'), (
+            PluginMenuItem(
+                link='plugins:netbox_rack_concept:conceptcomponent_list',
+                link_text=_('Components'),
+                permissions=['netbox_rack_concept.view_conceptcomponent'],
+            ),
+            PluginMenuItem(
+                link='plugins:netbox_rack_concept:conceptcable_list',
+                link_text=_('Cables'),
+                permissions=['netbox_rack_concept.view_conceptcable'],
+                buttons=cable_buttons
+            ),
+        )),
     )
 )

netbox_rack_concept/search.py

@@ -1,6 +1,6 @@
 from netbox.search import SearchIndex, register_search
 
-from .models import ConceptDevice, RackConcept
+from .models import ConceptCable, ConceptComponent, ConceptDevice, RackConcept
 
 
 @register_search
@@ -25,3 +25,25 @@ class ConceptDeviceIndex(SearchIndex):
         ('comments', 5000),
     )
     display_attrs = ('concept', 'status', 'device_type', 'role', 'description')
+
+
+@register_search
+class ConceptComponentIndex(SearchIndex):
+    model = ConceptComponent
+    fields = (
+        ('name', 100),
+        ('label', 110),
+        ('description', 500),
+    )
+    display_attrs = ('device', 'component_type', 'port_type')
+
+
+@register_search
+class ConceptCableIndex(SearchIndex):
+    model = ConceptCable
+    fields = (
+        ('label', 100),
+        ('description', 500),
+        ('comments', 5000),
+    )
+    display_attrs = ('status', 'type', 'description')

netbox_rack_concept/static/netbox_rack_concept/elevation.css

@@ -22,6 +22,27 @@
     fill: var(--tblr-primary-lt, #d7e7fb);
 }
 
+.concept-elevation .unit-slot.free {
+    cursor: pointer;
+}
+
+.concept-elevation .unit-slot.free:hover {
+    fill: var(--tblr-primary-lt, #d7e7fb);
+}
+
+/* "+ Add device" hint, shown only while hovering an empty unit - same trick as
+   NetBox's own rack elevation. */
+.concept-elevation .add-device-hint {
+    font-size: 10px;
+    fill: var(--tblr-primary, #206bc4);
+    opacity: 0;
+    pointer-events: none;
+}
+
+.concept-elevation a:hover .add-device-hint {
+    opacity: 1;
+}
+
 .concept-elevation .unit-label {
     font-size: 10px;
     fill: var(--tblr-secondary, #808f9c);

netbox_rack_concept/static/netbox_rack_concept/elevation.js

@@ -18,12 +18,21 @@
     function applyView(view) {
         const showImages = view !== 'labels-only';
         const showImageLabels = view === 'images-and-labels';
+        // "Images only" hides every plain label outright, not just the ones sitting
+        // under an image: a device without an image for this face has nothing to
+        // visually cover its label otherwise, which would leave text showing (e.g. on
+        // a rear face where only the front image is set) even though the user picked
+        // "images only".
+        const hidePlainLabels = view === 'images-only';
         container.querySelectorAll('image.device-image').forEach(function (el) {
             el.classList.toggle('hidden', !showImages);
         });
         container.querySelectorAll('.device-image-label').forEach(function (el) {
             el.classList.toggle('hidden', !showImageLabels);
         });
+        container.querySelectorAll('.device-label').forEach(function (el) {
+            el.classList.toggle('hidden', hidePlainLabels);
+        });
     }
 
     let initial = 'images-and-labels';

netbox_rack_concept/tables.py

@@ -3,9 +3,11 @@ from django.utils.translation import gettext_lazy as _
 
 from netbox.tables import NetBoxTable, columns
 
-from .models import ConceptDeployment, ConceptDevice, RackConcept
+from .models import ConceptCable, ConceptComponent, ConceptDeployment, ConceptDevice, RackConcept
 
 __all__ = (
+    'ConceptCableTable',
+    'ConceptComponentTable',
     'ConceptDeploymentTable',
     'ConceptDeviceElevationTable',
     'ConceptDeviceTable',
@@ -105,3 +107,66 @@ class ConceptDeploymentTable(tables.Table):
         fields = ('rack_name', 'rack', 'device_count', 'user', 'created')
         attrs = {'class': 'table table-hover object-list'}
         empty_text = _('This concept has not been deployed yet.')
+
+
+class ConceptComponentTable(NetBoxTable):
+    name = tables.Column(linkify=True)
+    device = tables.Column(linkify=True, verbose_name=_('Device'))
+    concept = tables.Column(accessor='device__concept', linkify=True, verbose_name=_('Concept'))
+    component_type = columns.ChoiceFieldColumn()
+    color = columns.ColorColumn()
+    connection = tables.Column(
+        accessor='cable', linkify=True, orderable=False, verbose_name=_('Connection'), empty_values=()
+    )
+    connect = tables.TemplateColumn(
+        template_code="""
+            {% load i18n %}
+            {% if not record.is_connected %}
+              <a href="{% url 'plugins:netbox_rack_concept:conceptcable_add' %}?concept={{ record.device.concept_id }}&amp;termination_a_device={{ record.device_id }}&amp;termination_a={{ record.pk }}"
+                 class="btn btn-sm btn-primary">{% trans "Connect" %}</a>
+            {% endif %}
+        """,
+        verbose_name='',
+        orderable=False
+    )
+    tags = columns.TagColumn(url_name='plugins:netbox_rack_concept:conceptcomponent_list')
+
+    class Meta(NetBoxTable.Meta):
+        model = ConceptComponent
+        fields = (
+            'pk', 'id', 'name', 'label', 'device', 'concept', 'component_type', 'port_type', 'positions', 'color',
+            'connection', 'connect', 'description', 'tags', 'created', 'last_updated',
+        )
+        default_columns = ('name', 'device', 'component_type', 'port_type', 'connection', 'connect')
+
+    def render_connection(self, value, record):
+        return value if value else _('Not connected')
+
+
+class ConceptCableTable(NetBoxTable):
+    id = tables.Column(linkify=True, verbose_name=_('ID'))
+    label = tables.Column(linkify=True)
+    concept = tables.Column(accessor='termination_a__device__concept', linkify=True, verbose_name=_('Concept'))
+    status = columns.ChoiceFieldColumn()
+    type = columns.ChoiceFieldColumn()
+    color = columns.ColorColumn()
+    termination_a_device = tables.Column(
+        accessor='termination_a__device', linkify=True, verbose_name=_('Device A')
+    )
+    termination_a = tables.Column(linkify=True, verbose_name=_('Component A'))
+    termination_b_device = tables.Column(
+        accessor='termination_b__device', linkify=True, verbose_name=_('Device B')
+    )
+    termination_b = tables.Column(linkify=True, verbose_name=_('Component B'))
+    tags = columns.TagColumn(url_name='plugins:netbox_rack_concept:conceptcable_list')
+
+    class Meta(NetBoxTable.Meta):
+        model = ConceptCable
+        fields = (
+            'pk', 'id', 'label', 'concept', 'status', 'type', 'color', 'termination_a_device', 'termination_a',
+            'termination_b_device', 'termination_b', 'description', 'tags', 'created', 'last_updated',
+        )
+        default_columns = (
+            'id', 'concept', 'status', 'type', 'termination_a_device', 'termination_a', 'termination_b_device',
+            'termination_b',
+        )

netbox_rack_concept/templates/netbox_rack_concept/conceptcable.html

@@ -0,0 +1,74 @@
+{% extends 'generic/object.html' %}
+{% load i18n %}
+{% load helpers %}
+
+{% block content %}
+<div class="row mb-3">
+  <div class="col col-md-6">
+    <div class="card">
+      <h2 class="card-header">{% trans "Cable" %}</h2>
+      <table class="table table-hover attr-table">
+        <tr>
+          <th scope="row">{% trans "Label" %}</th>
+          <td>{{ object.label|placeholder }}</td>
+        </tr>
+        <tr>
+          <th scope="row">{% trans "Status" %}</th>
+          <td>{% badge object.get_status_display bg_color=object.get_status_color %}</td>
+        </tr>
+        <tr>
+          <th scope="row">{% trans "Type" %}</th>
+          <td>{{ object.get_type_display|placeholder }}</td>
+        </tr>
+        <tr>
+          <th scope="row">{% trans "Color" %}</th>
+          <td>{% if object.color %}<span class="badge" style="background-color: #{{ object.color }}">&nbsp;&nbsp;&nbsp;</span> #{{ object.color }}{% else %}{{ ''|placeholder }}{% endif %}</td>
+        </tr>
+        <tr>
+          <th scope="row">{% trans "Description" %}</th>
+          <td>{{ object.description|placeholder }}</td>
+        </tr>
+      </table>
+    </div>
+    {% include 'inc/panels/comments.html' %}
+  </div>
+
+  <div class="col col-md-6">
+    <div class="card">
+      <h2 class="card-header">{% trans "Side A" %}</h2>
+      <table class="table table-hover attr-table">
+        <tr>
+          <th scope="row">{% trans "Concept" %}</th>
+          <td>{{ object.termination_a.device.concept|linkify }}</td>
+        </tr>
+        <tr>
+          <th scope="row">{% trans "Device" %}</th>
+          <td>{{ object.termination_a.device|linkify }}</td>
+        </tr>
+        <tr>
+          <th scope="row">{% trans "Component" %}</th>
+          <td>{{ object.termination_a|linkify }}</td>
+        </tr>
+      </table>
+    </div>
+
+    <div class="card">
+      <h2 class="card-header">{% trans "Side B" %}</h2>
+      <table class="table table-hover attr-table">
+        <tr>
+          <th scope="row">{% trans "Concept" %}</th>
+          <td>{{ object.termination_b.device.concept|linkify }}</td>
+        </tr>
+        <tr>
+          <th scope="row">{% trans "Device" %}</th>
+          <td>{{ object.termination_b.device|linkify }}</td>
+        </tr>
+        <tr>
+          <th scope="row">{% trans "Component" %}</th>
+          <td>{{ object.termination_b|linkify }}</td>
+        </tr>
+      </table>
+    </div>
+  </div>
+</div>
+{% endblock %}

netbox_rack_concept/templates/netbox_rack_concept/conceptcomponent.html

@@ -0,0 +1,109 @@
+{% extends 'generic/object.html' %}
+{% load i18n %}
+{% load helpers %}
+
+{% block extra_controls %}
+  {{ block.super }}
+  {% if not cable and perms.netbox_rack_concept.add_conceptcable %}
+    <a href="{% url 'plugins:netbox_rack_concept:conceptcable_add' %}?concept={{ object.device.concept_id }}&amp;termination_a_device={{ object.device_id }}&amp;termination_a={{ object.pk }}"
+       class="btn btn-primary">
+      <i class="mdi mdi-ethernet-cable"></i> {% trans "Connect" %}
+    </a>
+  {% endif %}
+{% endblock %}
+
+{% block content %}
+<div class="row mb-3">
+  <div class="col col-md-6">
+    <div class="card">
+      <h2 class="card-header">{% trans "Component" %}</h2>
+      <table class="table table-hover attr-table">
+        <tr>
+          <th scope="row">{% trans "Device" %}</th>
+          <td>{{ object.device|linkify }}</td>
+        </tr>
+        <tr>
+          <th scope="row">{% trans "Concept" %}</th>
+          <td>{{ object.device.concept|linkify }}</td>
+        </tr>
+        <tr>
+          <th scope="row">{% trans "Name" %}</th>
+          <td>{{ object.name }}</td>
+        </tr>
+        <tr>
+          <th scope="row">{% trans "Label" %}</th>
+          <td>{{ object.label|placeholder }}</td>
+        </tr>
+        <tr>
+          <th scope="row">{% trans "Component type" %}</th>
+          <td>{{ object.get_component_type_display }}</td>
+        </tr>
+        <tr>
+          <th scope="row">{% trans "Type" %}</th>
+          <td>{{ object.port_type|placeholder }}</td>
+        </tr>
+        {% if object.is_pass_through %}
+          <tr>
+            <th scope="row">{% trans "Positions" %}</th>
+            <td>{{ object.positions }}</td>
+          </tr>
+        {% endif %}
+        <tr>
+          <th scope="row">{% trans "Description" %}</th>
+          <td>{{ object.description|placeholder }}</td>
+        </tr>
+      </table>
+    </div>
+
+    {% if object.is_pass_through %}
+      <div class="card">
+        <h2 class="card-header">{% trans "Pass-through mapping" %}</h2>
+        {% if paired_components %}
+          <table class="table table-hover attr-table">
+            {% for component, own_position, other_position in paired_components %}
+              <tr>
+                <th scope="row">{% trans "Position" %} {{ own_position }}</th>
+                <td>{{ component|linkify }} &middot; {% trans "position" %} {{ other_position }}</td>
+              </tr>
+            {% endfor %}
+          </table>
+        {% else %}
+          <div class="card-body text-muted">
+            {% trans "No mapping to a port on the other side. Sync the device's components again if this looks wrong." %}
+          </div>
+        {% endif %}
+      </div>
+    {% endif %}
+  </div>
+
+  <div class="col col-md-6">
+    <div class="card">
+      <h2 class="card-header">{% trans "Connection" %}</h2>
+      {% if cable %}
+        <table class="table table-hover attr-table">
+          <tr>
+            <th scope="row">{% trans "Cable" %}</th>
+            <td>{{ cable|linkify }}</td>
+          </tr>
+          <tr>
+            <th scope="row">{% trans "Status" %}</th>
+            <td>{% badge cable.get_status_display bg_color=cable.get_status_color %}</td>
+          </tr>
+          <tr>
+            <th scope="row">{% trans "Connected to" %}</th>
+            <td>
+              {% if cable.termination_a_id == object.pk %}
+                {{ cable.termination_b.device|linkify }} &middot; {{ cable.termination_b|linkify }}
+              {% else %}
+                {{ cable.termination_a.device|linkify }} &middot; {{ cable.termination_a|linkify }}
+              {% endif %}
+            </td>
+          </tr>
+        </table>
+      {% else %}
+        <div class="card-body text-muted">{% trans "Not connected." %}</div>
+      {% endif %}
+    </div>
+  </div>
+</div>
+{% endblock %}

netbox_rack_concept/templates/netbox_rack_concept/conceptdevice.html

@@ -1,6 +1,16 @@
 {% extends 'generic/object.html' %}
 {% load i18n %}
 {% load helpers %}
+{% load render_table from django_tables2 %}
+
+{% block extra_controls %}
+  {{ block.super }}
+  {% if object.device_type and perms.netbox_rack_concept.add_conceptcomponent %}
+    <a href="{% url 'plugins:netbox_rack_concept:conceptdevice_sync_components' pk=object.pk %}" class="btn btn-outline-secondary">
+      <i class="mdi mdi-sync"></i> {% trans "Sync components" %}
+    </a>
+  {% endif %}
+{% endblock %}
 
 {% block content %}
 <div class="row mb-3">
@@ -99,4 +109,21 @@
     </div>
   </div>
 </div>
+
+<div class="row mb-3">
+  <div class="col col-md-12">
+    <div class="card">
+      <h2 class="card-header">
+        {% trans "Components" %}
+        {% if perms.netbox_rack_concept.add_conceptcomponent %}
+          <a href="{% url 'plugins:netbox_rack_concept:conceptcomponent_add' %}?device={{ object.pk }}"
+             class="btn btn-sm btn-primary float-end">
+            <i class="mdi mdi-plus-thick"></i> {% trans "Add component" %}
+          </a>
+        {% endif %}
+      </h2>
+      {% render_table component_table %}
+    </div>
+  </div>
+</div>
 {% endblock %}

netbox_rack_concept/templates/netbox_rack_concept/conceptdevice_sync_components.html

@@ -0,0 +1,34 @@
+{% extends 'base/layout.html' %}
+{% load i18n %}
+
+{% block title %}{% blocktrans with device=object %}Sync components for {{ device }}{% endblocktrans %}{% endblock %}
+
+{% block content %}
+<form action="" method="post">
+  {% csrf_token %}
+  <div class="row">
+    <div class="col col-md-8 offset-md-2">
+      <div class="card">
+        <h2 class="card-header">{% trans "Sync components from device type" %}</h2>
+        <div class="card-body">
+          <p>
+            {% blocktrans with device=object device_type=object.device_type %}
+              Creates any interfaces, ports and power connections that {{ device_type }} defines but
+              {{ device }} doesn't have yet, matched by name. Existing components - and any cables already
+              attached to them - are left exactly as they are, so this is safe to run again later, e.g. after
+              adding a component by hand or changing the device type.
+            {% endblocktrans %}
+          </p>
+          <p class="text-muted">
+            {% trans "Front and rear ports are linked the same way they are on the device type, so a patch panel's pass-through mapping carries over automatically." %}
+          </p>
+        </div>
+        <div class="card-footer text-end">
+          <a href="{{ return_url }}" class="btn btn-outline-danger">{% trans "Cancel" %}</a>
+          <button type="submit" class="btn btn-primary">{% trans "Sync components" %}</button>
+        </div>
+      </div>
+    </div>
+  </div>
+</form>
+{% endblock %}

netbox_rack_concept/templates/netbox_rack_concept/inc/elevation.html

@@ -12,13 +12,25 @@
        class="concept-elevation-svg" role="img"
        aria-label="{% blocktrans with face=elevation.face_label name=elevation.concept.name %}{{ face }} elevation of {{ name }}{% endblocktrans %}">
 
-    {# Unit rows and legend #}
+    {# Unit rows and legend. An empty unit becomes a click target for adding a device
+       here, exactly like a real rack's elevation. #}
     {% for unit in elevation.units %}
       <g class="unit">
+        {% if not unit.occupied and can_add_device %}
+          <a href="{% url 'plugins:netbox_rack_concept:conceptdevice_add' %}?concept={{ elevation.concept.pk }}&amp;position={{ unit.number }}&amp;face={{ elevation.face }}&amp;return_url={{ elevation.concept.get_absolute_url }}">
+            <rect x="{{ elevation.rack_x }}" y="{{ unit.y }}"
+                  width="{{ elevation.rack_width }}" height="{{ unit.height }}"
+                  class="unit-slot free"
+                  data-unit="{{ unit.number }}"></rect>
+            <text x="{{ elevation.rack_right|add:'-6' }}" y="{{ unit.y }}" dy="15"
+                  class="add-device-hint" text-anchor="end">+ {% trans "Add device" %}</text>
+          </a>
+        {% else %}
           <rect x="{{ elevation.rack_x }}" y="{{ unit.y }}"
                 width="{{ elevation.rack_width }}" height="{{ unit.height }}"
                 class="unit-slot"
                 data-unit="{{ unit.number }}"></rect>
+        {% endif %}
         <text x="{{ elevation.rack_x }}" y="{{ unit.y }}" dx="-4" dy="15"
               class="unit-label" text-anchor="end">{{ unit.number }}</text>
       </g>

netbox_rack_concept/templates/netbox_rack_concept/rackconcept.html

@@ -150,19 +150,11 @@
              data-starting-unit="{{ object.starting_unit }}"
              data-u-height="{{ object.u_height }}"
              data-desc-units="{{ object.desc_units|yesno:'true,false' }}">
-          {% include 'netbox_rack_concept/inc/elevation.html' with elevation=front_elevation %}
+          {% include 'netbox_rack_concept/inc/elevation.html' with elevation=front_elevation can_add_device=perms.netbox_rack_concept.add_conceptdevice %}
-          {% include 'netbox_rack_concept/inc/elevation.html' with elevation=rear_elevation %}
+          {% include 'netbox_rack_concept/inc/elevation.html' with elevation=rear_elevation can_add_device=perms.netbox_rack_concept.add_conceptdevice %}
         </div>
         <div id="concept-elevation-status" class="small text-muted mt-2"></div>
       </div>
-      {% if perms.netbox_rack_concept.add_conceptdevice %}
-        <div class="card-footer text-end">
-          <a href="{% url 'plugins:netbox_rack_concept:conceptdevice_add' %}?concept={{ object.pk }}&return_url={{ object.get_absolute_url }}"
-             class="btn btn-sm btn-primary">
-            <i class="mdi mdi-plus-thick"></i> {% trans "Add planned device" %}
-          </a>
-        </div>
-      {% endif %}
     </div>
 
     <div class="card">

netbox_rack_concept/urls.py

@@ -18,6 +18,12 @@ urlpatterns = [
     path('devices/', include(get_model_urls('netbox_rack_concept', 'conceptdevice', detail=False))),
     path('devices/<int:pk>/', include(get_model_urls('netbox_rack_concept', 'conceptdevice'))),
 
+    # Components and cabling
+    path('components/', include(get_model_urls('netbox_rack_concept', 'conceptcomponent', detail=False))),
+    path('components/<int:pk>/', include(get_model_urls('netbox_rack_concept', 'conceptcomponent'))),
+    path('cables/', include(get_model_urls('netbox_rack_concept', 'conceptcable', detail=False))),
+    path('cables/<int:pk>/', include(get_model_urls('netbox_rack_concept', 'conceptcable'))),
+
     # Entry points from real racks
     path('racks/<int:pk>/copy/', views.RackCopyView.as_view(), name='rack_copy'),
     path('racks/merge/', views.MergeRacksToConceptView.as_view(), name='racks_merge'),

netbox_rack_concept/views.py

@@ -16,11 +16,13 @@ from dcim.models import Rack
 from netbox.views import generic
 from utilities.views import ObjectPermissionRequiredMixin, ViewTab, register_model_view
 
-from . import deploy, filtersets, forms, tables
+from . import components, deploy, filtersets, forms, tables
 from .elevation import get_elevations
-from .models import ConceptDevice, RackConcept
+from .models import ConceptCable, ConceptComponent, ConceptDevice, RackConcept
 
 __all__ = (
+    'ConceptCableView',
+    'ConceptComponentView',
     'ConceptDeviceView',
     'MergeConceptsView',
     'MergeRacksToConceptView',
@@ -138,6 +140,50 @@ class ConceptDeviceView(generic.ObjectView):
     )
     template_name = 'netbox_rack_concept/conceptdevice.html'
 
+    def get_extra_context(self, request, instance):
+        component_table = tables.ConceptComponentTable(
+            instance.components.select_related('device').order_by('component_type', 'name'),
+            exclude=('device', 'concept'),
+            orderable=False,
+        )
+        component_table.configure(request)
+        return {
+            'component_table': component_table,
+        }
+
+
+@register_model_view(ConceptDevice, 'sync_components')
+class ConceptDeviceSyncComponentsView(ObjectPermissionRequiredMixin, View):
+    """Populate a device's components from its device type's templates."""
+    queryset = ConceptDevice.objects.all()
+
+    def get_required_permission(self):
+        return 'netbox_rack_concept.add_conceptcomponent'
+
+    def get(self, request, pk):
+        device = get_object_or_404(self.queryset.restrict(request.user, 'view'), pk=pk)
+        return render(request, 'netbox_rack_concept/conceptdevice_sync_components.html', {
+            'object': device,
+            'return_url': device.get_absolute_url(),
+        })
+
+    def post(self, request, pk):
+        device = get_object_or_404(self.queryset.restrict(request.user, 'view'), pk=pk)
+
+        if device.device_type is None:
+            messages.error(request, _('%(device)s has no device type to sync components from.') % {'device': device})
+            return redirect(device.get_absolute_url())
+
+        created, mapped = components.sync_components(device)
+        if created:
+            messages.success(request, _('Created %(count)s component(s).') % {'count': created})
+        else:
+            messages.info(request, _('No new components to create; everything is already in sync.'))
+        if mapped:
+            messages.success(request, _('Mapped %(count)s front/rear port pair(s).') % {'count': mapped})
+
+        return redirect(device.get_absolute_url())
+
 
 @register_model_view(ConceptDevice, 'add', detail=False)
 @register_model_view(ConceptDevice, 'edit')
@@ -506,3 +552,87 @@ class RackConceptReorderView(ObjectPermissionRequiredMixin, View):
             return JsonResponse({'error': ' '.join(exc.messages)}, status=400)
 
         return JsonResponse({'status': 'ok', 'updated': len(updated)})
+
+
+#
+# Concept components
+#
+
+@register_model_view(ConceptComponent, 'list', path='', detail=False)
+class ConceptComponentListView(generic.ObjectListView):
+    queryset = ConceptComponent.objects.select_related('device', 'device__concept')
+    table = tables.ConceptComponentTable
+    filterset = filtersets.ConceptComponentFilterSet
+    filterset_form = forms.ConceptComponentFilterForm
+
+
+@register_model_view(ConceptComponent)
+class ConceptComponentView(generic.ObjectView):
+    queryset = ConceptComponent.objects.select_related('device', 'device__concept')
+    template_name = 'netbox_rack_concept/conceptcomponent.html'
+
+    def get_extra_context(self, request, instance):
+        return {
+            'paired_components': instance.get_paired_components(),
+            'cable': instance.cable,
+        }
+
+
+@register_model_view(ConceptComponent, 'add', detail=False)
+@register_model_view(ConceptComponent, 'edit')
+class ConceptComponentEditView(generic.ObjectEditView):
+    queryset = ConceptComponent.objects.all()
+    form = forms.ConceptComponentForm
+
+
+@register_model_view(ConceptComponent, 'delete')
+class ConceptComponentDeleteView(generic.ObjectDeleteView):
+    queryset = ConceptComponent.objects.all()
+
+
+@register_model_view(ConceptComponent, 'bulk_delete', path='delete', detail=False)
+class ConceptComponentBulkDeleteView(generic.BulkDeleteView):
+    queryset = ConceptComponent.objects.select_related('device')
+    filterset = filtersets.ConceptComponentFilterSet
+    table = tables.ConceptComponentTable
+
+
+#
+# Concept cables
+#
+
+@register_model_view(ConceptCable, 'list', path='', detail=False)
+class ConceptCableListView(generic.ObjectListView):
+    queryset = ConceptCable.objects.select_related(
+        'termination_a', 'termination_a__device', 'termination_b', 'termination_b__device'
+    )
+    table = tables.ConceptCableTable
+    filterset = filtersets.ConceptCableFilterSet
+    filterset_form = forms.ConceptCableFilterForm
+
+
+@register_model_view(ConceptCable)
+class ConceptCableView(generic.ObjectView):
+    queryset = ConceptCable.objects.select_related(
+        'termination_a', 'termination_a__device', 'termination_b', 'termination_b__device'
+    )
+    template_name = 'netbox_rack_concept/conceptcable.html'
+
+
+@register_model_view(ConceptCable, 'add', detail=False)
+@register_model_view(ConceptCable, 'edit')
+class ConceptCableEditView(generic.ObjectEditView):
+    queryset = ConceptCable.objects.all()
+    form = forms.ConceptCableForm
+
+
+@register_model_view(ConceptCable, 'delete')
+class ConceptCableDeleteView(generic.ObjectDeleteView):
+    queryset = ConceptCable.objects.all()
+
+
+@register_model_view(ConceptCable, 'bulk_delete', path='delete', detail=False)
+class ConceptCableBulkDeleteView(generic.BulkDeleteView):
+    queryset = ConceptCable.objects.select_related('termination_a', 'termination_b')
+    filterset = filtersets.ConceptCableFilterSet
+    table = tables.ConceptCableTable