Line Compensation Settings - AT&T MERLIN LEGEND Key System Planning

Lines
Line Compensation
* Factory setting.
3-18
Line options
Line compensation adjusts for the amount of cable loss in decibels (dBs). It is
based on the length of cable between the 100D module and the CSU or
between the module and another far-end connection—for example, a line
repeater.
The factory setting is a value of 1, which allows a maximum loss of 0.6 dB. The
other possible settings are shown in Table 3-4 (based on 22-gauge cable).
Table 3-4 Line Compensation Settings
Setting
1*
2
3
4
5
Planning Form Instructions—Continued
On Form 3c, for each module in the system:
5.
Under the "Frame Format" heading:
Check "D4" to retain the factory setting.
Check "ESF" to change the factory setting (required for ISDN-PRI and
International data transmission).
6.
Under the "Supression" heading:
Check "AMI-ZCS" to retain the factory setting.
Check "B8ZS" to change the factory setting (required for ISDN-PRI).
Under the "Line Compression" heading:
7.
Fill in the approximate distance (number of cable feet) between the 100D
module and the CSU or other far-end connection next to "Cable Feet".
8.
Use Table 3-4 to select the line compensation setting needed.
Check "1" (.6db) to retain the factory setting.
Check the setting (2-5) required because of the distance between the
module and the CSU or other far-end connection.
dB Loss
-0.6
-1.2
-1.8
-2.4
-3.0
Cable Feet
0 – 1 3 3
1 3 3 – 2 6 6
2 6 6 – 3 9 9
3 9 9 – 5 3 3
5 3 3 – 6 5 5