Chapter 1 Overview
Chassis Components
•One or two route processor cards (RPs). The RPs function as the Cisco
Only one RP is required for system operation. For redundant operation, you can order a second RP as an option
The RP also monitors system alarms and controls the system fans. LEDS on the front panel indicate active alarm conditions.
•Fan tray. The fans pull cool air through the chassis. A removable air filter is located below the PLIM card cage at the front of the chassis. The fan tray has four fans that provide n+1 redundancy.
•Four switch fabric cards (SFCs). These cards provide the
The switch fabric receives user data from one MSC and PLIM pair and performs the switching necessary to route the data to the appropriate egress MSC and PLIM pair. The switch fabric is divided into eight logical planes (four physical planes) that are used to evenly distribute the traffic across the switch fabric. Each switch fabric card implements two planes of the switch fabric.
•A power system that provides redundant power to the chassis. The power system consists of an AC power shelf, which contains four AC rectifier modules, or a DC power shelf, which encloses four DC power supplies. The power shelf (AC or DC as ordered) is
The PLIM side of the chassis is considered the front of the chassis, where user data cables attach to the PLIMs and cool air enters the chassis. The switch fabric card side, which is where warm air is exhausted, is considered to be the rear of the chassis.
Cisco
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