Ring-Down Circuits in Broadcast Television
A ring-down is a dedicated telephone circuit between two locations. There are no phone numbers and nothing to dial. Pick up either handset and the telephone at the other end rings. For college football...
Category: Reference
Wiring charts, pinouts, color codes, equipment references, and downloadable sheets for working A2s.
Fiber Optic Color Code
Fiber optic cable doesn’t always have numeric labels identifying each individual fiber. When the fibers are identified by color, the standard 12-color sequence can be used to determine the fiber number. If you’re familiar...
Telephone Wire Color Code (25 Pair)
A standard 25-pair telephone cable uses two groups of five colors to identify each pair. The five major colors are White, Red, Black, Yellow, Violet. The five minor colors are Blue, Orange, Green, Brown,...
A2 Reference Sheet
The A2 Reference has a Telephone wire color code chart, Belden Color Code chart, Pin-outs for common intercom headsets, BP-325 Programming settings, DT-12 Pinouts and RJ-45 Pin-outs for straight and crossover cables.
DT-12 Fan-out Color Code (Belden)
When a DT-12 fan-out is made with Belden 1513C 12-pair cable, each pair can be identified by the color of its inner jacket. The pairs are numbered 1 through 12 and follow the color...