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Cisco CRS-1 Carrier Routing System 8-Slot Line Card Chassis Site Planning Guide
OL-5802-06
Chapter 1 Cisco CRS-1 Carrier Routing System
The Cisco CRS-1 8-Slot Line Card Chassis
Figure 1-2 Rear (MSC) View of the 8-Slot Line Card Chassis
Chassis Components
The Cisco CRS-1 8-slot line card chassis contains the following components:
• As many as eight modular services cards (MSCs), also called line cards, and eight physical layer
interface modules (PLIMs). The MSC and PLIM are an associated pair of cards that mate through
the chassis midplane. The MSC provides the forwarding engine for Layer 3 routing of user data, and
the PLIM provides the physical interface and connectors for the user data.
The MSC can be associated with several different PLIMs, which provide different interface speeds
and technologies. The available PLIMs are as follows:
–
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.
1 Upper fan tray (beneath cover) 4 MSC slots
2 Chassis vertical mounting brackets 5 Lower fan tray
3 Switch fabric card (half-height) slots 6 Power distribution units (PDUs)
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