CSU/DSU Network, T1, Fractional T1, T3 line RJ-48

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8 pin RJ45 (8P8C) male connector
at the cable (RJ-48 used)

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 tip from network
8	R	receive ring 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.

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8 pin RJ45 (8P8C) female connector
at the device or outlet (RJ-48 used)

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Last updated at Sun May 13 2007 (�� )	�� ?

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CSU/DSU Network, T1, Fractional T1, T3 line RJ-48

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