Table of Contents

BPX Switch Physical Overview

BPX Switch Physical Overview

This chapter describes the physical components of the BPX switch:

• BPX Switch Enclosure
  
  

BPX Switch Enclosure

The BPX switch enclosure is a self-contained chassis which may be rack mounted in any standard
19-inch rack or enclosure with adequate ventilation. It contains a single shelf that provides fifteen slots for vertically mounting the BPX switch cards front and rear.

At the front of the enclosure (see Figure 2-1) are 15 slots for mounting the BPX switch front cards. Once inserted, the cards are locked in place by the air intake grille at the bottom of the enclosure.

To remove or insert cards, a mechanical latch on the air intake grille must be released by using a screwdriver and the grille must be tilted forward in order.

At the rear of the enclosure (illustrated in Figure 2-2) is another series of card slots for mounting the rear plug-in cards. These are held in place with two thumbscrews, top and bottom. A mid-plane, located between the two sets of plug-in cards, is used for interconnect and is visible only when the cards are removed.

Warning To provide proper cooling, it is essential that blank faceplates be installed in all unused slots. Failure to do so will degrade node cooling and circuit card damage will result. The blank faceplates also provide RFI shielding.

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.

Node DC Powering

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.

Optional AC Power Supply Assembly

For applications requiring operation from an AC power source, an optional AC Power Supply Assembly and shelf is available. It provides a source of -48 VDC from 208/240 VAC input. A shelf, separate from the BPX switch shelf, houses one or two AC Power Supplies and mounts directly below the node cabinet. This provides a secure enclosure for the power supply assemblies (supplies cannot be removed without the use of tools).

Two of these supplies are usually operated in parallel for fail-safe redundant operation. The front of the AC Power Supplies for the BPX switch includes two green LEDs to indicate correct range of the AC input and the DC output for each individual supply (see Figure 2-4).

Card Shelf Configuration

There are fifteen vertical slots in the front of the BPX switch enclosure to hold plug-in cards (see Figure 2-5).

The middle two slots, slots number 7 and number 8, are used for the primary and secondary Broadband Controller Cards (BCC).

The right-most slot, number 15, is used to hold the single Alarm/Status Monitor Card.

The other twelve slots, number 1 through number 6 and number 8 through number 14, can be used for the Network Interface and Service Interface cards.

BPX Switch Major Hardware Component Groups

There are four major groups of hardware components in the BPX switch:

• Common Core Components
  
• Network Interface Components
  
• Service Interface Components
  
• Power Supply Components
  

Table 2-1 lists these groups and their components along with a brief description of each.

For a detailed description of these components, see:

Service Expansion Shelf PNNI

The Cisco BPX SES PNNI Controller is an optional Service Expansion Shelf (SES) controller connected diretly to a BPX 8600 series switch to provide Private Network to Network Interface (PNNI) signaling and routing for the establishment of ATM switched virtual circuits (SVCs) and Soft Permanent Virtual Circuits (SPVCs) over a BPX 8600 wide area network. However, the SES can be used in several WAN switching applications and is not limited to function only as a BPX SES PNNI Controller

Every BPX 8600 series switch that deploys PNNI signaling and routing is collocated and attached to a BPX SES PNNI Controller. The BPX SES PNNI Controller uses Cisco's Virtual Switch Interface (VSI) protocol to control the BPX switch for its networking application.

The BPX SES PNNI Controller is a 7-slot chassis that contains two Processor Switch Modules (PXMs) that run the PNNI and SVC software. One of the PXMs serves as the active processor, while the other serves as the standby. The PNNI controller is mounted direclty atop the BPX switch and cabled to it through either the OC-3 ATM interface (Figure 1-3) or the DS3 interfaces (Figure 1-4).

For instructions on installing a Service Expansion Shelf in a BPX 8620 rack and initially powering up, see Cisco Service Expansion Shelf (SES) Hardware Installation Guide. To configure an SES PNNI for a BPX 8620, see the Cisco SES PNNI Controller Software Configuration Guide.

Optional Peripherals

At least one node in the network (or network domain if a structured network) must include a Cisco WAN Manager network management station (see Figure 2-6).

A Y-cable may be used to connect the LAN ports on the primary and secondary BCC Line Modules, through an AUI to the LAN network, because only one BCC is active at a time.

The serial Control port may be connected to a dial-in modem for remote service support or other dial-up network management access. The serial Auxiliary Port can be used for incoming and outgoing data as well as the Autodial feature to report alarms to Cisco TAC.