Cisco CRS-1 - Manual (Page 16)

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Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Site Planning Guide
OL-5802-09
Chapter 1 Cisco CRS Carrier Routing System
The Cisco CRS 8-Slot Line Card Chassis
Each MSC or FP can be associated with several different PLIMs, which provide different interface
speeds and technologies. The available PLIMs are:
– 1-port OC-768c/STM-256c packet-over-SONET (POS). Available with short-reach (SR) optics.
– 4-port OC-192c/STM-64c POS/DPT. Available with long-reach (LR), intermediate-reach (IR),
short-reach (SR), and very-short-reach (VSR) optics.
– OC-48c/STM-16c POS/DPT, configurable with 1 to 16 ports. Available with long-reach (LR)
and short-reach (SR) optics. This PLIM supports pluggable optics.
– 10-Gigabit Ethernet PLIMs (available with a variety of optics, including LR). These PLIMs
support pluggable XENPAK and XFP optics, and can be configured with up to 20 ports,
depending on the PLIM.
– 100-Gigabit Ethernet PLIM. This single-port PLIM supports a pluggable CFP optics module.
– Cisco CRS SPA Interface Processor-800. Occupies one PLIM slot on the Cisco CRS 16- and
8-Slot LCC. Supports six normal-height SPAs or three double-height SPAs or any combination
in between.
• Chassis midplane. The midplane connects MSCs to their associated PLIMs and allows an MSC to
be removed from the chassis without having to disconnect the cables that are attached to the
associated PLIM. The midplane distributes power, connects the MSCs to the switch fabric cards, and
provides control plane interconnections. The midplane is not field replaceable by the customer.
• One or two route processor cards (RPs). The RPs provide the intelligence of the system by
functioning as the LCC system controller and providing route processing. Only one RP is required
for system operation. For redundant operation, you can order a second, redundant RP as an option
(CRS-8-RP/R). When two RPs are used, only one RP is active at a time. The second RP acts as a
“standby” RP, serving as a backup if the active RP fails.
The RP also monitors system alarms and controls the system fans. LEDS on the front panel indicate
active alarm conditions.
A Performance Route Processor (PRP) is also available for the Cisco CRS 8-slot line card chassis.
Two PRPs perform the same functions as two RPs, but provide enhanced performance for both route
processing and system controller functionality.
Note A chassis may not be populated with a mix of RP and PRP cards. Both route processor cards
should be of the same type (RP or PRP).
• Upper and lower fan trays. 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. Each fan tray contains four fans.
• Four half-height switch fabric cards (SFCs). These cards provide the three-stage Benes switch fabric
(S1/S2/S3) for the routing system. The switch fabric performs the cross-connect function of the
routing system, connecting every MSC (and its associated PLIM) with every other MSC (and its
associated PLIM) in the system.
The switch fabric receives user data from one MSC (or FP) and PLIM pair and performs the
switching necessary to route the data to the appropriate egress MSC (or FP) and PLIM pair. The
switch fabric is divided into eight planes that 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. Two types of power systems are
available: fixed configuration power and modular configuration power. Both power configurations
use either AC or DC power. The fixed configuration power solution contains two power distribution
units (PDUs), with either one AC rectifier or one DC power entry modules (PEM) per PDU. Each