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Connecting the Control Unit to the Network Interface
RJ2GX Interface
The RJ2GX interface is a 25-pair amphenol connector that interfaces up to
eight tie trunks. You construct the cross-connect field in the same way as for
the RJ21X interface (see “RJ21X Interface” earlier in this chapter).
RJ21X and RJ2GX interfaces do not require separate termination blocks. If
there is room on the termination block for the trunk wires, both the RJ21X and
the RJ2GX can be punched down on the same 110AB1-100JP12 block. Any
wires not used are left unterminated.
CAUTION:
Be careful not to connect tie trunks to GS, LS, or DID ports. Since all
the jacks on the termination block are 8-wire jacks, it is possible to
interchange tie-trunk wires with GS, LS, or DID wires accidentally.
RJ48C/X Interface
The RJ48C/X interface terminates a DS1 trunk at the customer’s premises.
Both RJ48C and RJ48X interfaces have 8-wire modular jacks. However, the
RJ48X interface includes shorting bars that loop the DS1 trunk’s receive pair
to the transmit pair. This helps in testing the DS1 trunk from the central office.
Wiring
4-13