AT&T MERLIN LEGEND Installation & Maintenance Manual page 151

Installation
two GMT fuses for protection of the local powering circuitry
four test points
Note: The transmit path in the OR 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 compensate for signal
levels in the range of 0 to -27.7 dB.
Connect the 551 T1 L1 CSU to the 100D Module
Connect the 100D module to the CSU'S rear panel (see
Figure 27):
1. Place an adapter on the end of the D8W cord from the 100D
module.
2. Plug the adapter into the 15-pin subminiature connector.
Note: The maximum length of cable from the 100D module to the
CSU for line compensation is 655 feet.
Table 3-25 shows the pin assignments for the rear panel
connections.
Channel Service Unit 3-43