The RJ-48 connector look very similar to a RJ-45 connector drawn. But it"s different. RJ-48 connections are made with a STP (Shielded Twisted Pair) cable (not UTP - Unshielded Twisted Pair). RJ-48 uses a pin out arrangement, voltage level, and line capacitance different from a typical RJ-45.
RJ-48S Jack Connector pinout
| Pin | Signal | Description |
| 1 | R1 | transmit ring to network |
| 2 | T1 | transmit tip to network |
| 3 | | not used |
| 4 | | not used |
| 5 | | not used |
| 6 | | not used |
| 7 | T | receive ring from network |
| 8 | R | receive tip from network |
RJ-48C Jack Connector pinout
| Pin | Signal | Description |
| 1 | R1 | transmit ring to network |
| 2 | T1 | transmit tip to network |
| 3 | | not used |
| 4 | T | receive tip from network |
| 5 | R | receive ring from network |
| 6 | | not used |
| 7 | | not used |
| 8 | | not used |
Cable for conection of WAN port with wall outlet is shielded (STP) straightforward (R to R, T to T) with R with T, R1 with T1 wires twisted.
