Polycom DOC2558B manual ISDN/PSTN Clock Source

Chapter 1- Hardware Description

LAN & LEDs E1/T1 connections

H/S LED

Figure 1-3RMX 2000 RTM ISDN Rear Panel Layout

The RTM ISDN card supports 200 audio participants, regardless of whether the spans are E1 or T1.

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.

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