Polycom DOC2559C manual Component Description

Chapter 1- Hardware Description

Table 1-9Polycom RMX 4000 Component Description (Continued)

Component	Description
AC/DC Power	The AC Power Supply drawers are located below the
Supply Modules	MPM+/MPMx Cards and are connected to the backplane
	by means of a power connector. Operating at 100-240
	volts AC 50/60 Hz all power supplies have built-in load
	sharing capabilities.
	On systems with DC current, the Power Rail Module
	(PRM) provides direct current to the rear of the RMX
	through the backplane.
Fan Drawer	Eight fans are mounted sideways and stacked in a
	drawer. The drawer is connected to the Back-plane by a
	connector.
	Airflow is from right to left, and out the side of the MCU.
	Each time a board temperature sensor passes one of its
	thresholds an event is sent to the ShelfManager,
	whereupon an threshold alert is posted on the RMX
	Manager, and increases the fans speed. There are
	currently 3 sets of thresholds: Normal, Major and Critical.
	When the temperature reaches a critical threshold (and
	the fan’s speed increase did not resolve the issue), the
	controller of the relevant board initiates a shut down.
Multi Processor	The MPM+ cards, perform the various RTP, audio and
Module+ (MPM+)	video processing functions on the RMX 4000 unit. TI
Card	C6455 processors are at the core of each MPM+ card
	which are available in the following assemblies:
	• MPM+20 (20 CIF resources)
	• MPM+40 (40 CIF resources)
	• MPM+80 (80 CIF resources)
	Note: An MPM+ located (on the front panel) must face
	opposite (same slot level) an RTM LAN card (installed on
	the rear panel). For more information, see "RTM LAN” on
	page 1-30.

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