Cable Truck from Computer Cable Store. Constructed of rugged 1" steel tubing. The Cable Truck and the Cable Caddy are 43" tall and can accommodate spools up to 16" wide on solid steel 1/2" axles.
The SuperLooper ISDN (PRI) Loopback Jack and Plug can be used to check ISDN (PRI) cabling for broken or shorted wires and network interfaces for the simplest functionality.