Patch Cable Length Calculator
Independent & Chassis Switches • Devices • Multiple Cabinets (row) • Multiple Trays
? Quick help 
Cabinet Configuration
%
| # | Name | Cabinet Spacing → Next | Height (U) | Cable Managers (U, comma sep) |
|---|
Switch Configuration
Name each chassis and (optionally) override start u per cabinet.
Per-cabinet Chassis Names
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
DCIM Cab
Connection Parameters
Applies to Manual, Bulk, and the Visual.
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
Close
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.
The Rack must match a cabinet name. For chassis mode, the Switch must match a per-cabinet chassis name.
Sets 24/48 for bulk math & visual.
Patching Assigner Settings
Chassis Blade Settings
Switch Port Map
Define VLAN port ranges per switch.
Cable List
Format: Cable Label VLAN