Table 4-26. Csu Rear-Panel Pin Assignments - AT&T MERLIN LEGEND Release 2.0 Installation Section

Connecting the Control Unit to the Network Interface
The transmit path in the office repeater has an adjustable artificial line; this
allows the transmit level to be adjusted to 0, 7.5, or 15 dB to meet the
required -15 or -22.5 dB section loss. The receive path contains a fixed
7.5 dB artificial line and an Automatic Line Build-Out (ALBO) circuit, which
automatically compensates for signal levels in the range of 0 to -27.7 db.
Step 6: Connecting the 551 T1 CSU to the 100D Module
a. Connect the 100D module to the CSU rear panel (see Figure 4-9).
NOTE:
The maximum length of cable from the 100D module to the CSU for
line compensation is 655 ft (200 m).
Table 4-26 shows the pin assignments for the rear panel connections.

Table 4-26. CSU Rear-Panel Pin Assignments

PIN #
1
2
4
5
b. Connect the network interface cord to pins 1, 2, 4, and 5 on terminal
block 1 (TB1) on the rear panel of the CSU.
100D Module
DESIG SIGNAL
T1 RCV (tip)
R1 RCV (ring)
R XMT (ring)
T XMT (tip)
551 T1 CSU
D-CONN
3
11
9
1
Installing the Channel Service Unit
DESIG
SIGNAL
T XMT (tip)
R XMT (ring)
R1 RCV (ring)
T1 RCV (tip)
4-41