Filter
Top Products
1-6
Cisco CRS-1 Carrier Routing System 8-Slot Line Card Chassis Installation Guide
OL-6256-08
Chapter 1 Overview
Chassis Cable Management
–
Four half-height switch fabric card slots (SM0, SM1, SM2, and SM3)
The MSC slot numbers are reversed from the PLIM slot numbers on the other side of the chassis.
Because an MSC mates with its associated PLIM through the midplane, MSC slot 0 is on the far right
side of the chassis looking at it from the rear (MSC) side.
PLIM slot 0 is on the far left side of the chassis, looking at if from the front (PLIM) side. MSC slot 0
and
PLIM slot 0 mate with each other through the midplane, and so do all other MSC and PLIM slots (0
through 7).
Chassis Cable Management
The Cisco CRS-1 8-slot line card chassis has cable management features for the front (PLIM) side of the
chassis, just above the card cage. The horizontal cable management trays have a special telescoping
feature that allows them to be extended when the chassis is upgraded with higher-density cards. This
extension also helps when installing the cables in the chassis.
The cable management bracket is shown in the following figure.
Figure 1-5 Cable Management Bracket
Chassis Cooling System
The chassis has two fan trays, each with several fans, that cool the chassis card cages. Cool air flows in
at the bottom front of the chassis and flows through the chassis card cages and through the fans in the
fan trays before being exhausted through the bottom rear of the chassis (see the following figure). In
addition, each AC or DC power module at the bottom of the chassis has self-contained fans that pull in
cool air from the front of the chassis and exhaust warm air out the rear.
A replaceable air filter is located on the front of the chassis below the PLIM card cage. Each power
module also has a replaceable air filter that attaches to the module at the front (PLIM) side of the chassis.
How often the air filters should be replaced depends on the facility environment. In a dirty environment,
or when you start getting frequent temperature alarms, you should always check the intake grills for
debris, and then check the air filters to see if they need to be replaced.
122789