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Isdn/pstn clock source, Rtm lan, Ac power entry module (pem) – Polycom RMX DOC2548A User Manual

Page 34: Isdn/pstn clock source -28, Rtm lan -28 ac power entry module (pem) -28

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Chapter 1- Hardware Description

1-28

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.

RTM LAN

The RTM LAN card routes data between the MPM+ cards and

components of the system, sends media by IP packets and provides

connectivity to external networks.
An RTM LAN card must connect directly to an MPM+ card. In an RMX

with a single MPM+ card, the RTM LAN card must be installed in the rear
panel slot on the same level as the MPM+ card.

Each RTM LAN card includes 2 LAN ports and a maximum of four RTM

LAN cards can be installed on the RMX 4000.

Figure 1-13

RMX 4000 RTM LAN Rear Panel Layout

AC Power Entry Module (PEM)

An AC PEM includes a power inlet, EMI filter and backplane connectors.

Power input to the system is fed via a PEM (Power Entry Module)

through backplane into the power supply. Each AC power module has its

own dedicated power cable. The ON/OFF switch on the rear of the RMX

activates any power module installed on the RMX. An AC system has

three AC PEMs, one for each power module. On failure, both AC power

supplies and PEMs are hot swappable.

2 LAN Connections &

LEDs