AT&T MERLIN LEGEND Release 3.1 Installation Manual page 150

Wiring
8 Test the central office trunks for proper connection.
See "Testing Trunks," later in this chapter, for instructions.
9 Label the network interface jacks, control unit module jacks, termination
blocks, and D2R cords.
See "Labeling Trunks," later in this chapter, for instructions.
10 For each trunk, plug one end of a D2R cord into the designated jack on
the termination block and the other end into the line/trunk jack on the
proper control unit module.
NOTE:
The modular jacks on the termination block are 8-wire jacks. The D2R cords,
which are 6-wire, also plug into the 8-wire jacks.
!
CAUTION:
Do not plug an analog multiline telephone, an MLX telephone, or
anything else that should be plugged into an extension jack into this
wiring field: doing so will busy-out the trunk.
Connecting the Control Unit to the Network Interface
4–9