Isdn/Pstn Clock Source - Polycom DOC2558B Hardware Manual

Chapter 1- Hardware Description
LAN & LEDs
Figure 1-3

ISDN/PSTN Clock Source

Each RTM ISDN card has its own primary and secondary clock source.
The first span to synchronize becomes the primary clock source and the
second span to synchronize becomes the secondary clock source. This
clock is used to synchronize ISDN spans only (it is not the system clock).
A single clock source triggers an alarm that can be turned off by setting
the appropriate flag in the system configuration.
1-14
H/S LED
RMX 2000 RTM ISDN Rear Panel Layout
The RTM ISDN card supports 200 audio participants, regardless of whether the
spans are E1 or T1.
E1/T1 connections