diff --git a/src/lib/components/NetworkDiagram.svelte b/src/lib/components/NetworkDiagram.svelte
index fd46bf5..0f9998f 100644
--- a/src/lib/components/NetworkDiagram.svelte
+++ b/src/lib/components/NetworkDiagram.svelte
@@ -15,6 +15,7 @@
 		deletePort,
 		renameOwner,
 		renamePort,
+		setPortCable,
 		setPortConnection,
 		type OwnerKind,
 		withReconciledConnections
@@ -25,7 +26,7 @@
 	import { validateNetworkData, type ValidationIssue } from '$lib/data/networkSchema';
 	import transformNetworkDataToGraph from '$lib/graph/transformNetworkData';
 	import { computeSearchMatches } from '$lib/graph/searchHighlight';
-	import type { GraphNodeData, GraphTransformResult } from '$lib/graph/types';
+	import type { GraphEdgeData, GraphNodeData, GraphTransformResult } from '$lib/graph/types';
 	import { themeMode, type ThemeMode } from '$lib/stores/theme';
 	import type { NetworkData, Port } from '$lib/types';
 	import Modal from './Modal.svelte';
@@ -571,6 +572,12 @@
 					color: theme === 'dark' ? '#94a3b8' : '#64748b'
 				}
 			},
+			{
+				selector: 'edge[cableColor]',
+				style: {
+					'line-color': 'data(cableColor)'
+				}
+			},
 			{
 				selector: 'node[vlanColor]',
 				style: {
@@ -1417,6 +1424,31 @@
 		updateDevicePortConnection(deviceIndex, portIndex, next);
 	}
 
+	function updatePortCableField(
+		kind: OwnerKind,
+		ownerName: string,
+		port: Port,
+		field: 'type' | 'color' | 'lengthM',
+		value: string
+	) {
+		const current: NonNullable<NonNullable<Port['connectedTo']>['cable']> = {
+			...(port.connectedTo?.cable ?? {})
+		};
+		if (field === 'lengthM') {
+			const parsed = Number(value);
+			if (value.trim() && Number.isFinite(parsed) && parsed >= 0) {
+				current.lengthM = parsed;
+			} else {
+				delete current.lengthM;
+			}
+		} else if (value.trim()) {
+			current[field] = value.trim();
+		} else {
+			delete current[field];
+		}
+		applyDraft(setPortCable(networkData, kind, ownerName, port.portName, current));
+	}
+
 	function deleteMachine(machineIndex: number) {
 		const machine = networkData.machines[machineIndex];
 		if (!machine) {
@@ -1734,6 +1766,33 @@
 			tooltip.visible = false;
 		});
 
+		cy.on('mouseover', 'edge[kind = "physical"]', (event) => {
+			const edge = event.target;
+			const data = edge.data() as GraphEdgeData;
+			const parts = [
+				`${data.sourcePort ?? '?'} ↔ ${data.targetPort ?? '?'}`,
+				...(data.speedGbps ? [`${data.speedGbps}GbE`] : []),
+				...(data.cableType ? [data.cableType] : []),
+				...(data.cableColorName ? [data.cableColorName] : []),
+				...(typeof data.cableLengthM === 'number' ? [`${data.cableLengthM}m`] : [])
+			];
+			const midpoint = edge.renderedMidpoint();
+			const clampedPosition = clampTooltipPosition(
+				midpoint.x + tooltipOffset.x,
+				midpoint.y + tooltipOffset.y
+			);
+			tooltip = {
+				visible: true,
+				text: parts.join(' · '),
+				x: clampedPosition.x,
+				y: clampedPosition.y
+			};
+		});
+
+		cy.on('mouseout', 'edge', () => {
+			tooltip.visible = false;
+		});
+
 		cy.on('pan zoom', () => {
 			tooltip.visible = false;
 		});
@@ -2150,6 +2209,27 @@
 			<p class="icon-results-empty">No icons match your search.</p>
 		{/if}
 	</div>
+	<datalist id="cable-type-options">
+		<option value="Cat5e"></option>
+		<option value="Cat6"></option>
+		<option value="Cat6a"></option>
+		<option value="Cat7"></option>
+		<option value="Cat8"></option>
+		<option value="DAC"></option>
+		<option value="Fibre"></option>
+	</datalist>
+	<datalist id="cable-color-options">
+		<option value="blue"></option>
+		<option value="red"></option>
+		<option value="green"></option>
+		<option value="yellow"></option>
+		<option value="orange"></option>
+		<option value="purple"></option>
+		<option value="pink"></option>
+		<option value="white"></option>
+		<option value="grey"></option>
+		<option value="black"></option>
+	</datalist>
 	{#if selectedTarget?.type === 'machine' && selectedMachine}
 		<div class="inline-actions">
 			{#if selectedMachineHostId && selectedMachineVmCount > 0}
@@ -2452,6 +2532,57 @@
 								)}
 						/>
 					</label>
+					{#if port.connectedTo}
+						<label>
+							Cable Type
+							<input
+								type="text"
+								list="cable-type-options"
+								value={port.connectedTo.cable?.type ?? ''}
+								on:change={(event) =>
+									updatePortCableField(
+										'machine',
+										selectedMachine.machineName,
+										port,
+										'type',
+										(event.currentTarget as HTMLInputElement).value
+									)}
+							/>
+						</label>
+						<label>
+							Cable Colour
+							<input
+								type="text"
+								list="cable-color-options"
+								value={port.connectedTo.cable?.color ?? ''}
+								on:change={(event) =>
+									updatePortCableField(
+										'machine',
+										selectedMachine.machineName,
+										port,
+										'color',
+										(event.currentTarget as HTMLInputElement).value
+									)}
+							/>
+						</label>
+						<label>
+							Cable Length (m)
+							<input
+								type="number"
+								min="0"
+								step="0.5"
+								value={port.connectedTo.cable?.lengthM ?? ''}
+								on:change={(event) =>
+									updatePortCableField(
+										'machine',
+										selectedMachine.machineName,
+										port,
+										'lengthM',
+										(event.currentTarget as HTMLInputElement).value
+									)}
+							/>
+						</label>
+					{/if}
 					<div class="item-actions">
 						<button
 							type="button"
@@ -2628,6 +2759,57 @@
 								)}
 						/>
 					</label>
+					{#if port.connectedTo}
+						<label>
+							Cable Type
+							<input
+								type="text"
+								list="cable-type-options"
+								value={port.connectedTo.cable?.type ?? ''}
+								on:change={(event) =>
+									updatePortCableField(
+										'device',
+										selectedDevice.name,
+										port,
+										'type',
+										(event.currentTarget as HTMLInputElement).value
+									)}
+							/>
+						</label>
+						<label>
+							Cable Colour
+							<input
+								type="text"
+								list="cable-color-options"
+								value={port.connectedTo.cable?.color ?? ''}
+								on:change={(event) =>
+									updatePortCableField(
+										'device',
+										selectedDevice.name,
+										port,
+										'color',
+										(event.currentTarget as HTMLInputElement).value
+									)}
+							/>
+						</label>
+						<label>
+							Cable Length (m)
+							<input
+								type="number"
+								min="0"
+								step="0.5"
+								value={port.connectedTo.cable?.lengthM ?? ''}
+								on:change={(event) =>
+									updatePortCableField(
+										'device',
+										selectedDevice.name,
+										port,
+										'lengthM',
+										(event.currentTarget as HTMLInputElement).value
+									)}
+							/>
+						</label>
+					{/if}
 					<div class="item-actions">
 						<button
 							type="button"
diff --git a/src/lib/data/networkEditor.ts b/src/lib/data/networkEditor.ts
index 691e9ff..13b85c2 100644
--- a/src/lib/data/networkEditor.ts
+++ b/src/lib/data/networkEditor.ts
@@ -1,4 +1,4 @@
-import type { Machine, NetworkData, NetworkDevice, Port, VM } from '../types';
+import type { CableInfo, Machine, NetworkData, NetworkDevice, Port, VM } from '../types';
 
 export type OwnerKind = 'machine' | 'device';
 
@@ -119,9 +119,10 @@ function ensureReciprocalConnections(data: NetworkData) {
 					continue;
 				}
 
-				const expectedReciprocal = {
+				const expectedReciprocal: Port['connectedTo'] = {
 					device: owner.name,
-					port: port.portName
+					port: port.portName,
+					...(port.connectedTo.cable ? { cable: deepClone(port.connectedTo.cable) } : {})
 				};
 				if (!targetPort.connectedTo) {
 					targetPort.connectedTo = expectedReciprocal;
@@ -132,6 +133,19 @@ function ensureReciprocalConnections(data: NetworkData) {
 					equalsIgnoreCase(targetPort.connectedTo.device, owner.name) &&
 					equalsIgnoreCase(targetPort.connectedTo.port, port.portName);
 				if (hasMatchingReciprocal) {
+					// keep cable metadata identical on both ends; the lexicographically
+					// smaller owner:port key is the canonical copy so the sync is deterministic
+					const ownKey = `${owner.name}:${port.portName}`.toLowerCase();
+					const targetKey = `${targetOwner.name}:${targetPort.portName}`.toLowerCase();
+					const [from, to] =
+						ownKey <= targetKey
+							? [port.connectedTo, targetPort.connectedTo]
+							: [targetPort.connectedTo, port.connectedTo];
+					if (from.cable) {
+						to.cable = deepClone(from.cable);
+					} else {
+						delete to.cable;
+					}
 					continue;
 				}
 			}
@@ -330,6 +344,47 @@ export function deletePort(
 	return cloned;
 }
 
+export function setPortCable(
+	data: NetworkData,
+	kind: OwnerKind,
+	ownerName: string,
+	portName: string,
+	cable: CableInfo | undefined
+): NetworkData {
+	const cloned = cloneNetworkData(data);
+	const owner = findOwnerByKindAndName(cloned, kind, ownerName);
+	const port = owner ? findPort(owner, portName) : undefined;
+	if (!owner || !port?.connectedTo) {
+		return cloned;
+	}
+
+	const entries = Object.entries(cable ?? {}).filter(([, value]) =>
+		typeof value === 'number' ? Number.isFinite(value) : Boolean(value)
+	);
+	const normalized = entries.length > 0 ? (Object.fromEntries(entries) as CableInfo) : undefined;
+
+	if (normalized) {
+		port.connectedTo.cable = deepClone(normalized);
+	} else {
+		delete port.connectedTo.cable;
+	}
+
+	const peerOwner = findOwnerByName(cloned, port.connectedTo.device);
+	const peerPort = peerOwner ? findPort(peerOwner, port.connectedTo.port) : undefined;
+	if (
+		peerPort?.connectedTo &&
+		equalsIgnoreCase(peerPort.connectedTo.device, owner.name) &&
+		equalsIgnoreCase(peerPort.connectedTo.port, port.portName)
+	) {
+		if (normalized) {
+			peerPort.connectedTo.cable = deepClone(normalized);
+		} else {
+			delete peerPort.connectedTo.cable;
+		}
+	}
+	return cloned;
+}
+
 export function setPortConnection(
 	data: NetworkData,
 	kind: OwnerKind,
diff --git a/src/lib/graph/transformNetworkData.ts b/src/lib/graph/transformNetworkData.ts
index 0108a26..5749b55 100644
--- a/src/lib/graph/transformNetworkData.ts
+++ b/src/lib/graph/transformNetworkData.ts
@@ -57,6 +57,28 @@ function connectionKey(a: string, b: string): string {
 	return a < b ? `${a}|${b}` : `${b}|${a}`;
 }
 
+const cableColorHex: Record<string, string> = {
+	blue: '#3b82f6',
+	red: '#ef4444',
+	green: '#22c55e',
+	yellow: '#eab308',
+	orange: '#f97316',
+	purple: '#a855f7',
+	pink: '#ec4899',
+	white: '#e2e8f0',
+	grey: '#94a3b8',
+	gray: '#94a3b8',
+	black: '#334155'
+};
+
+function resolveCableColor(name: string | undefined): string | undefined {
+	if (!name) {
+		return undefined;
+	}
+	const trimmed = name.trim();
+	return cableColorHex[trimmed.toLowerCase()] ?? (/^#[0-9a-fA-F]{3,8}$/.test(trimmed) ? trimmed : undefined);
+}
+
 function buildVlanResolver(subnets: Subnet[] | undefined) {
 	const vlanSubnets = (subnets ?? [])
 		.filter((subnet) => typeof subnet.vlanId === 'number')
@@ -315,6 +337,7 @@ export default function transformNetworkDataToGraph(data: NetworkData): GraphTra
 
 			physicalEdgeCounter += 1;
 			const speedGbps = edgeSpeed(port.speedGbps, targetPort.speedGbps);
+			const cable = port.connectedTo?.cable ?? targetPort.connectedTo?.cable;
 
 			edges.push({
 				data: {
@@ -326,7 +349,11 @@ export default function transformNetworkDataToGraph(data: NetworkData): GraphTra
 					sourcePort: port.portName,
 					targetPort: connectedTo.port,
 					speedGbps,
-					reciprocal
+					reciprocal,
+					...(cable?.type ? { cableType: cable.type } : {}),
+					...(cable?.color ? { cableColorName: cable.color } : {}),
+					...(resolveCableColor(cable?.color) ? { cableColor: resolveCableColor(cable?.color) } : {}),
+					...(typeof cable?.lengthM === 'number' ? { cableLengthM: cable.lengthM } : {})
 				}
 			});
 		}
diff --git a/src/lib/graph/types.ts b/src/lib/graph/types.ts
index 161e649..ddb1e1d 100644
--- a/src/lib/graph/types.ts
+++ b/src/lib/graph/types.ts
@@ -8,6 +8,11 @@ export interface PortDetails {
 	connectedTo?: {
 		device: string;
 		port: string;
+		cable?: {
+			type?: string;
+			color?: string;
+			lengthM?: number;
+		};
 	};
 }
 
@@ -79,6 +84,10 @@ export interface GraphEdgeData {
 	targetPort?: string;
 	speedGbps?: number;
 	reciprocal?: boolean;
+	cableType?: string;
+	cableColorName?: string;
+	cableColor?: string;
+	cableLengthM?: number;
 }
 
 export interface GraphNodeElement {
diff --git a/src/lib/shared/networkSchemaCore.mjs b/src/lib/shared/networkSchemaCore.mjs
index 9a39a63..057a967 100644
--- a/src/lib/shared/networkSchemaCore.mjs
+++ b/src/lib/shared/networkSchemaCore.mjs
@@ -1,6 +1,7 @@
 /**
  * @typedef {{ path: string; message: string }} ValidationIssue
- * @typedef {{ device: string; port: string }} ConnectedTo
+ * @typedef {{ type?: string; color?: string; lengthM?: number }} CableInfo
+ * @typedef {{ device: string; port: string; cable?: CableInfo }} ConnectedTo
  * @typedef {{ portName: string; speedGbps?: number; macAddress?: string; connectedTo?: ConnectedTo }} Port
  * @typedef {{ name: string; role: string; ipAddress: string; iconKey?: string; macAddress?: string }} VM
  * @typedef {{ cpu: string; ram: string; networkPorts: number; networkPortSpeedGbps?: number; gpu?: string }} Hardware
@@ -118,8 +119,36 @@ export function normalizePort(issues, path, value, ownerLabel) {
 		} else {
 			const device = readString(issues, `${path}.connectedTo.device`, value.connectedTo.device);
 			const port = readString(issues, `${path}.connectedTo.port`, value.connectedTo.port);
+			let cable;
+			const cableRaw = value.connectedTo.cable;
+			if (cableRaw !== undefined) {
+				if (!isRecord(cableRaw)) {
+					issues.push({ path: `${path}.connectedTo.cable`, message: 'must be an object' });
+				} else {
+					const cableType = readString(issues, `${path}.connectedTo.cable.type`, cableRaw.type, {
+						optional: true,
+						allowEmpty: true
+					});
+					const cableColor = readString(issues, `${path}.connectedTo.cable.color`, cableRaw.color, {
+						optional: true,
+						allowEmpty: true
+					});
+					const lengthM = readNumber(issues, `${path}.connectedTo.cable.lengthM`, cableRaw.lengthM, {
+						optional: true,
+						min: 0
+					});
+					const candidate = {
+						...(cableType ? { type: cableType } : {}),
+						...(cableColor ? { color: cableColor } : {}),
+						...(typeof lengthM === 'number' ? { lengthM } : {})
+					};
+					if (Object.keys(candidate).length > 0) {
+						cable = candidate;
+					}
+				}
+			}
 			if (device && port) {
-				connectedTo = { device, port };
+				connectedTo = { device, port, ...(cable ? { cable } : {}) };
 			}
 		}
 	}
diff --git a/src/lib/types.ts b/src/lib/types.ts
index 1a1b26c..eda2958 100644
--- a/src/lib/types.ts
+++ b/src/lib/types.ts
@@ -1,6 +1,13 @@
+export interface CableInfo {
+	type?: string;
+	color?: string;
+	lengthM?: number;
+}
+
 export interface ConnectedPortRef {
 	device: string;
 	port: string;
+	cable?: CableInfo;
 }
 
 export interface Port {
diff --git a/static/data/network.json b/static/data/network.json
index cd75de5..aaba535 100644
--- a/static/data/network.json
+++ b/static/data/network.json
@@ -55,7 +55,12 @@
 					"macAddress": "84:47:09:1c:aa:10",
 					"connectedTo": {
 						"device": "Gigabit Switch",
-						"port": "1"
+						"port": "1",
+						"cable": {
+							"type": "Cat6",
+							"color": "blue",
+							"lengthM": 1
+						}
 					}
 				},
 				{
@@ -67,7 +72,12 @@
 					"speedGbps": 1,
 					"connectedTo": {
 						"device": "Gigabit Switch",
-						"port": "2"
+						"port": "2",
+						"cable": {
+							"type": "Cat6",
+							"color": "blue",
+							"lengthM": 1
+						}
 					}
 				},
 				{
@@ -101,7 +111,12 @@
 					"speedGbps": 1,
 					"connectedTo": {
 						"device": "Gigabit Switch",
-						"port": "3"
+						"port": "3",
+						"cable": {
+							"type": "Cat5e",
+							"color": "red",
+							"lengthM": 2
+						}
 					}
 				}
 			]
@@ -337,7 +352,12 @@
 					"speedGbps": 1,
 					"connectedTo": {
 						"device": "ProxRouter",
-						"port": "eth0"
+						"port": "eth0",
+						"cable": {
+							"type": "Cat6",
+							"color": "blue",
+							"lengthM": 1
+						}
 					}
 				},
 				{
@@ -345,7 +365,12 @@
 					"speedGbps": 1,
 					"connectedTo": {
 						"device": "ProxRouter",
-						"port": "eth2"
+						"port": "eth2",
+						"cable": {
+							"type": "Cat6",
+							"color": "blue",
+							"lengthM": 1
+						}
 					}
 				},
 				{
@@ -353,7 +378,12 @@
 					"speedGbps": 1,
 					"connectedTo": {
 						"device": "Asustor NAS",
-						"port": "eth0"
+						"port": "eth0",
+						"cable": {
+							"type": "Cat5e",
+							"color": "red",
+							"lengthM": 2
+						}
 					}
 				},
 				{