The V.35 / X.21 Breakout Box is a troubleshooting tool used to determine the wiring of a V.35 or X.21 interface on a networking device or computer. The breakout box can be inserted between two V.35 or X.21 devices to determine which wires are active. Breakout boxes are useful in troubleshooting connection problems resulting from a manufacturers device not using standard pinning or general trouble shooting signals in cabling. The unit has status LED’s for each signal and flash or are solid green. Each signal lead on the unit allows user to break, pass or force individual signals or jumper together.

When using a Breakout Box, the interpretation of the LEDS can at times be misleading. Many short term events, are undetected by a very brief flash of an LED. Also, constant events such as clocks or constant data may only be a faint glow on the LED. The V.35 Breakout Box contains circuitry to help alleviate this problem. A pulse stretching technique is used to keep the LED illuminated long enough to be interpreted.

The V.35 / X.21 Breakout Box is housed in a sturdy aluminum enclosure and is supplied with an internal linear power supply. The unit has a 110/120 volt rotary select switch located on the rear of the housing. The unit can operate on standard power found in all countries.