Nortel Communication Server 1000S Installation And Configuration Manual page 202

Page 202 of 394
553-3001-201 Standard 2.00
Clock Controller description and installation
Figure 62
Example 3, Clocking Hierarchy referenced to a Public Network Master
Clock
Small System
LD 60
TRCK PCK
Slave
LD 73:
PREF loop W
SREF <cr>
Clocking off Master:
Tracking on Primary
loop W, no secondary
source.
Small System
LD 60
TRCK PCK
Slave
LD 73:
PREF loop Y
SREF <cr>
Clocking off Master:
Tracking on Primary
loop Y, no secondary
source.
This is an example of a "STAR" arrangement— one Hub PBX is linked to the
Central Office and all other PBXs are connected as slaves. When a second
Digital loop from the system which forms the hub of this network becomes
available, it can be used as a Secondary Clock Source in case the Primary
Source fails.
September 2004
loop W
Small System
LD 60
TRCK PCK
LD 73:
PREF loop A
SREF loop B
loop Y
Small System
LD 60
TRCK PCK
Slave
LD 73:
PREF loop Z
SREF <cr>
loop Z
Clocking off Master:
Tracking on Primary
loop Z, no secondary
source.
loop A
Central
Office
loop B
Small System
loop X
LD 60
TRCK PCK
Slave
LD 73:
PREF loop X
SREF <cr>
Clocking off Master:
Tracking on Primary
loop X, no secondary
source.
553-AAA0067
Master
Clock