Avaya G860, Установка и эксплуатация

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Issue 1 October 2007 19
2. Hardware Overview
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Venting holes - for air intake and exhaust, sized to provide for blockage of frequencies
within the specified range
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Blank panels with contact fingers - used for covering empty slots when a configuration
requires such
„
RFI filters - built-in to the DC power inputs, assuring that conductive interference does
not reach the Power Supply Modules, or that switching signals generated by the
Power Supply Modules do not propagate over the main feed
„
Air filters - integrates a honeycomb EMI shield in its assembly. The honeycomb
structure consists of "cells" that are engineered to trap and absorb EMI noise while
maintaining 95% to 99% aperture for minimal airflow impedance. A gasket installed
around the frame makes sure there is conductivity of the frame to the enclosure.
2.3.3 Midplane Keying
Each slot is equipped with a key on the midplane to match the appropriate board type
in order to prevent inserting a wrong board type into the slot.
Note: While the slot keys on the midplane are designed to prevent the insertion of
a board in an incorrect location, be sure NOT to force a board into a slot to
avoid damaging either the board or the midplane.
2.4 Cooling System
The Avaya G860 Media Gateway components are cooled by a fan tray unit (FM),
located at the left of the card cage. The fan tray unit draws cool air in through a
perforated grill on the left side of the chassis. The incoming air passes through a
removable filter (located within the fan assembly, immediately inside the perforated
grill), whose honeycombed design prevents RF interference. The air flows over the
boards, cooling them and sends the warmed air out the perforated grill on the right
side of the chassis.