Cisco CRS-1 System Description page 13

Chapter 1 Cisco CRS 4-Slot Line Card Chassis Overview
Up to four MSC, FP, or LSP line cards and four PLIMs. A line card and a PLIM are an associated
•
pair of cards that mate through the chassis midplane. The line card provides the forwarding engine
for Layer 3 routing of user data, and the PLIM provides the physical interface and connectors for
the user data.
A line card can be associated with several different PLIMs, which provide different interface speeds
and technologies. The PLIM types that are available are as follows:
–
–
For complete PLIM information, see the Cisco CRS Carrier Routing System
Packet-over-SONET/SDH Physical Layer Interface Module Installation Note and the Cisco CRS
Carrier Routing System Gigabit Ethernet Physical Layer Interface Module Installation Note.
An optional interface solution (to PLIMs) is also available. SPA interface processors (SIPs) and
•
shared port adapters (SPAs) can be installed instead of PLIMs. A SIP is a carrier card that is similar
to a PLIM and inserts into a Cisco CRS 4-slot line card chassis slot and interconnects to an MSC
like a PLIM. Unlike PLIMs, SIPs provide no network connectivity on their own.
A SPA is a modular type of port adapter that inserts into a subslot of a compatible SIP carrier card
to provide network connectivity and increased interface port density. A SIP can hold one or more
SPAs, depending on the SIP type and the SPA size. POS/SDH and Gigabit Ethernet SPAs are
available. For complete SIP and SPA information, see the Cisco CRS Carrier Routing System SIP
and SPA Hardware Installation Guide.
A chassis midplane. The midplane connects line cards to their associated PLIMs and allows a line
•
card 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 line cards to the switch fabric cards,
and provides control plane interconnections. The midplane is not field replaceable by the customer.
Two route processor cards (RPs). The RPs provide the intelligence of the system by functioning as
•
the Cisco CRS 4-slot line card chassis system controller and performing route processing. 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 4-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
Four switch fabric cards (SFCs). These cards provide a three-stage Benes switch fabric for the
•
system. The switch fabric receives user data from one line card and PLIM pair and performs the
switching necessary to route the data to the appropriate egress line card and PLIM pair. The Cisco
CRS 4-slot line card chassis contains switch fabric cards that provide all three stages of the
three-stage Benes switch fabric and the four SFCs provide the chassis with a total switching capacity
of 320 Gbps.
A single AC power shelf with four AC rectifiers in each power shelf. The power shelf and AC
•
rectifiers provide 4,000 watts of redundant input power for the chassis.
A single DC power shelf with four DC power supplies. The DC power system provides 4,000 watts
•
to power the chassis.
OL-10805-10
Packet-over-SONET/SDH (POS) PLIMs
Gigabit Ethernet PLIMs
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).
Cisco CRS Carrier Routing System 4-Slot Line Card Chassis System Description
Chassis Components
1-3