Nortel ICS Install Manual page 523

4. Press ' until the display shows the card you
want to view.
5. Press ≠.
6. Press ' until the display shows ClockSrc.
7. Press CHANGE to toggle the setting.
8. Press ® to exit or ' to continue in Hardware.
Tips -
DTI or DTI card configured as PRI in your ICS to act as a
primary reference. The only application where you might not
have a DTI or a DTI card configured as PRI designated as
primary reference is in a network where your Norstar system
is connected back-to-back with another switch using a T1 link.
If the other switch is loop-timed to your Norstar system, your
DTI or DTI card configured as PRI can be designated as a
timing master.
Tips -
DTIs, you cannot assign more than one DTI as primary
reference or all of the DTIs as secondary reference.
You can only have one primary reference and one secondary
reference per system. See T1 or ISDN-PRI configurations for
more information.
N0130943 02
In most T1 network configurations, you need one
(continued) If your Norstar system has two or more
Hardware / 523
Modular ICS 7.1 Installer Guide