AT&T MERLIN LEGEND Installation & Maintenance Manual page 192

Installation
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).
Note: RJ21X and RJ2GX interfaces do not require separate
termination blocks. If there is room on the termination block for
the line 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
and vice versa. Since all the jacks on the termination block
are 8-wire jacks, it is possible to accidentally interchange
tie-trunk wires with GS, LS, or DID wires.
RJ48C/X Interface
The
RJ48C/X interface terminates a
premises. Both RJ48C and RJ48X
modular jacks. However, the RJ48X interface includes shorting
bars that loop the T1 facility's receive pair to the transmit pair.
This helps in testing the T1 facility from the CO.
Testing CO Lines/Trunks
Before connecting the CO lines/trunks to the CU, you must verify
that a dial tone is being received and that you can dial out on
every line.
Note: DID trunks can be tested only through the CU; do not test
DID trunks at this time.
3-84 System Wiring
DS1 line at the customer's
have 8-wire
interfaces