Node Cooling; Node Dc Powering; Figure 2-2 Bpx Switch Exterior Rear View - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

Cisco bpx-bxm-155-8dx: user guide

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BPX Switch Physical Overview

Node Cooling

A fan assembly with three six-inch 48 VDC fans is mounted on a tray at the rear of the BPX switch

shelf (see Figure 2-2). Air for cooling the cards is drawn through an air intake grille located at the

bottom in the front of the enclosure. Air passes up between the vertically-mounted cards and exhausts

at the top, rear of the chassis.

All unused slots in the front are filled with blank faceplates to properly channel airflow.

The primary power for a BPX switch node is -48 VDC which is bused across the backplane for use by

all card slots. DC-to-DC converters on each card convert the -48V to lower voltages for use by the card.

The -48 VDC input connects directly to the DC Power Entry Module (PEM). The DC Power Entry

Module (see Figure 2-3) provides a circuit breaker and line filter for the DC input.

Nodes may be equipped with either a single PEM or dual PEMs for redundancy. PEMs are mounted at

the back of the node below the backplane. A conduit hookup box or an insulated cover plate is provided

for terminating conduit or wire at the DC power input. It is recommended that the source of DC for the

node be redundant and separately fused.

Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001

BPX Switch Exterior Rear View

Cisco BPX 8600 Series Installation and Configuration

BPX Switch Enclosure

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