# RJ-48C interface

An RJ-48C interface is an RJ-45 connector with pin assignments specified by ANSI to have a single 4-wire T1/E1 connection.

RJ-48C interfaces use the following pin assignments:

## Pin assignments

The RJ-48C interface uses the following pin assignments:

Pin | Description
1 | Receive from network (ring).
2 | Receive from network (tip).
3 | No connection.
4 | Transmit to network (ring).
5 | Transmit to network (tip).
6 | No connection.
7 | Optional shield, not used.
8 | Optional shield, not used.