Instruction manual

MERLIN LEGEND Communications System Release 5.0
System Planning
555-650-112
Issue 1
June 1997
Lines/Trunks
Page 3-28Selecting Line/Trunk Options
3
NOTE:
CCS is automatically assigned when PRI is selected. Also, Channel
24 cannot be used for voice or data transmissions.
6. Under the Line Compensation heading:
a. Fill in the approximate distance (number of cable feet) between the
100D module and its CSU or other far-end connection in the space
before Cable Feet.
b. Use Table 3-4
to select the line compensation setting needed. (The
factory setting is a value of 1.)
Table 3-4. Line Compensation Settings (Based on 22-Gauge Cable)
*
Based on 22-gauge cable.
7. If the system includes both 800 NI-BRI and 100D modules, clock
synchronization planning should be completed at the same time. There is
only one primary/secondary/tertiary clock for both 800 NI-BRI modules and
100D modules, with the same system programming screens used for both
types.
Plan your clock source administration to minimize the need for clock
switching, which is known to cause noise on active calls.
Under Priority, in the Clock Synchronization section, do
one of the
following:
■ If installing only one 100D module:
— To keep the factory setting, check Primary (that is, this
module provides synchronization for the system).
— If the synchronization source is other than through the 100D
module, check None.
■ If installing more than one 100D module, decide which module, if
any, provides the primary synchronization:
— If Module 1 provides clock synchronization, check Primary in
the first box (the factory setting).
— If Module 2 (or Module 3) provides clock synchronization,
check Primary in the box that describes that 100D module.
— If the synchronization source is other than through a 100D
module, check None.
Setting dB Loss Cable Feet*
1 (factory setting) -0.6 0−133
2 -1.2 133−266
3 -1.8 266−399
4 -2.4 399−533
5 -3.0 533−655