Matrix: Audio trunking cable wiring for Eclipse / Matrix +3 frames

The audio trunking cable shown below allows for audio trunking between two Eclipse (or Matrix +3 frames) or it can be used to link two EF-701M interfaces together directly.  Only the audio pairs are used when trunking two frames together, the RS-422 pairs are not needed or they can be looped back to themselves (pin 1 to pin 7, pin 2 to pin 8) in order to have the frame recognize that the frame is being used and activate the port light. 
A standard CAT-5 patch cable can be rewired at one end to make an audio crossover cable



















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