Patch Cable Length Calculator
Independent & Chassis Switches - Devices - Multiple Cabinets (row) - Multiple Trays
? Quick help
Cabinet Configuration
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| # | Name | Cabinet Spacing → Next | Height (U) | Cable Managers (U, comma sep) |
|---|
Rack Builder
Source of truth for all physical devices. Define switches, patch panels, and devices per cabinet. Ports are locked to template-defined values.
Loading Rack Builder...
Device Library
Create reusable device templates (height + port count). Templates are saved in this browser (localStorage).
Select a template to auto-fill the connection parameters.
Per-Port Layout
Define the exact U position, exit side, and offset (cm) for every port in this template.
Tip: offsets are measured from the port's exit side (left/right) to the port.
| Port | Exit Side | Offset from Edge (cm) | Port U | Notes |
|---|
Project / Config
Saved locally in this browser. Use Export/Import for sharing or backups.
Tray Configuration
Set a name and vertical gap (from top of rack) for each tray.
| # | Name | Vertical Gap (top of rack ↕) |
|---|
Manual Input
Bulk Input
Patching Assigner
Floor Plan
Connection Parameters
Source
Applies to Manual, Bulk & Visual.
Destination
In "Up & Over" mode, a fixed 10 cm route slack is added by default.
Patch Panel Ports
Switch Ports
Visual Route
Racks & Panels Patch Lead Route
Assumptions & Constants
Quick Help
Use this tool to calculate patch cable lengths between patch panels, switches, and devices across one or more rack cabinets.
- Routing Path: Choose Through the center or Up & over (tray). In Up & over, the cable goes from PP to the top of its rack, up the tray gap, across, down the tray gap, then down to the endpoint. A fixed 10 cm route slack is added in this mode.
- Trays: Configure multiple trays above, set names and gap values, then select a tray when routing = "Up & over".
- Manual Input: Click a port bubble to auto-fill fields - results update live.
- Bulk Input: Paste rows in the specified format to compute many at once.
- Export: Download CSV/XLSX for ordering and documentation.
- Save: Use quick saves locally, or Export/Import JSON to share.
- Link: cablehelp.dvdp.co.uk
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Bulk Cable Length Calculator
Use spaces, tabs, or commas. Blade is optional (defaults to 1 in the "with blade" format).
The Rack must match a cabinet name. For chassis mode, the Switch must match a per-cabinet chassis name.
Rack Builder formats: Use
The Rack must match a cabinet name. For chassis mode, the Switch must match a per-cabinet chassis name.
Rack Builder formats: Use
Rack, RU, Port, [Label,] Rack, RU, Port - devices must exist in the Rack Builder. Unresolved devices will hard fail.
Sets 24/48 for bulk math & visual.
Patching Assigner Settings
Chassis Blade Settings
Existing Connections (Port Allocation Workbook)
Upload your Port Allocation Excel workbook to block already-used ports so the Patching Assigner will not overlap existing connections. If the workbook contains a legend with Service + Port Allocation, empty VLAN port ranges can also be prefilled automatically.
Switch Port Map
Define VLAN port ranges per switch.
Cable List
Format: Cable Label VLAN
Patching Schedule Output
Validate a Manual Schedule
Upload a CSV or Excel file with columns: Cable Label, Switch, Blade, Port, VLAN. Blade column is optional.
Schedule Comparison
Upload two patching schedules to see exactly what changed — new cables, removed cables, and any ports or VLANs that moved.