What cable do I have to use with ISDN/PRI E1 and T1?To connect Skip2PBX to a PBX using an E1 trunk you must FOLLOW THESE CABLE SPECIFICATIONS:
| RJ-45 Pin PBX Side | Signal | Description | Direction | Signal | RJ-45 Pin Skip2PBX side |
|---|---|---|---|---|---|
| Shield | Ground | Shell/Braid | Ground | Shield | |
| J1-1 | RX Tip | Twisted Pair #1 | <— | TX Tip | J2-4 |
| J1-2 | RX Ring | Twisted Pair #1 | <— | TX Ring | J2-5 |
| J1-3 | RX Shield | Twisted Pair #3 | TX Shield | J2-6 | |
| J1-4 | TX Tip | Twisted Pair #2 | —> | RX Tip | J2-1 |
| J1-5 | TX Ring | Twisted Pair #2 | —> | RX Ring | J2-2 |
| J1-6 | TX Shield | Twisted Pair #4 | RX Shield | J2-3 |
Because the RJ-45 to RJ-45 cable has polarity, the pinouts differ depending on which end of the cable you use.
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