Nortel Communication Server 1000S Installation And Configuration Manual page 204

Page 204 of 394
553-3001-201 Standard 2.00
Clock Controller description and installation
Figure 64
Example 5, digital connection to the CO
Master Clock
Central
Office
loop W
Small System
LD 60
TRCK PCK
Slave
LD 73:
PREF loop W
SREF loop A
Clocking off Master:
Tracking on Primary
loop W and loop A
used as a secondary
clock source.
In this example, digital connections to the Central Office do exist. When a
second Digital loop from the CO becomes available, it can be used as a
Secondary Clock Source in case the Primary Source fails.
Slaves can track on each other as a secondary source since the chances of both
links to the Central Offices going down at the same time are minimal.
All Central Offices must have a path back to the same stratum 1 source.
September 2004
Master Clock
Central
Office
loop X
Small System
LD 60
TRCK PCK
Slave
LD 73:
loop
PREF loop X
A
SREF loop A
Clocking off Master:
Tracking on Primary
loop X and loop A
used as a secondary
clock source.
Master Clock
Central
Office
loop Y
Small System
LD 60
TRCK PCK
Slave
LD 73:
loop
PREF loop Y
B
SREF loop B
Clocking off Master:
Tracking on Primary
loop Y and loop B
used as a secondary
clock source.
553-AAA0069