Nortel Meridian 1 Administration And Maintenance page 158

Page 144 of 492
553-3011-311 Standard 7.0
Chapter 4 — Network clocking
In Example 2, there is no digital connection to the local exchange. For TIE
lines between PBXs facilitated by a local exchange, clocking is derived from
the PBX, not the local exchange. When a second Digital loop is available, it
can be used as a Secondary Clock source in case the Primary Source fails.
Example 2
Isolated Private Network with Secondary Reference Clock
Option 11
LD 60
TRCK FRUN
LD 73:
PREF <cr>
SREF <cr>
Master clock
Master Clock source:
Non-tracking (Free run)
May 1999
loop X
loop Y
Option 11
LD 60
loop X
TRCK PCK
LD 73:
loop Y
PREF loop X
SREF loop Y
Slave
Clocking off Master:
Tracking on Primary
loop X and loop Y used
as a secondary clock
source
553-7562.EPS