T1 Crossover Cable, Loopback Plug
Note: This is not included with the PBX.
The image displayed shows the cross-over cable pinout for a standard T1. This cable should be plugged into your Smartjack (provided by the Carrier) and your PBXtra 's PRI card (Sangoma A10X model of cards).
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Alternatively, Smartronix (example) sells T1/E1 or ISDN/PRI crossover adapters (same wiring, different colors - one is pale greenish-white or mint, the other is yellow).
If purchasing an adapter, make certain you get at least one crossover adapter. Loopbacks are for testing.
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A T1/PRI crossover cable is needed in certain situations where the transmit and receive pins are switched. Not to be confused with an Ethernet crossover - the pinout is different.
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