AT&T MERLIN LEGEND Installation & Maintenance Manual page 189

Installation
RJ21X Interface
The RJ21X interface has a female 50-pin (25-pair) amphenol
connector (see Figure 38). To connect the RJ21 X interface to the
CU, you must build a wiring field between the RJ21X interface
and the CU. This field, in effect, converts the female amphenol
connector to 8-wire modular jacks.
Building the Wiring Field
Build the wiring field between the network interface and the CU
by using 110AB1-100JP12 terminal blocks with modular jacks
and associated hardware. Use the hardware and procedure
below to build this wiring field.
Hardware (see Figure 39)
110AB1-100JP12 termination blocks with modular jacks
110A1 wire troughs
D-rings
D2R cords
Tools (see Figure 40)
D-impact tool
spudger
hand tools
Procedure
Follow these steps to connect the RJ21X network interface to the
CU:
1. Drill two diagonally opposite holes in a suitable backboard
(plywood is recommended) for each piece of hardware. Keep
a 1/16-inch space between each piece of hardware.
System Wiring 3-81