Cisco Systems 12406 series manual Switch Fabric Card Slots, Alarm Card Slots, Chassis Backplane

Chapter 1 Product Overview

Chassis

Switch Fabric Card Slots

The switch fabric circuitry resides in five fabric card slots: two for CSCs and three for SFCs. (See Figure 1-1.) For more information about the role of the switch fabric circuitry, see the “Multigigabit Crossbar Switch Fabric” section on page 1-10.

Alarm Card Slots

Cisco 12006 and Cisco 12406 routers are equipped with two alarm cards. These cards are positioned beside one another and occupy two card slots directly under the CSC slots. (See Figure 1-1.) For more information about the role of the alarm cards, see the “Alarm Cards” section on page 1-35.

Note The two alarm cards occupy slots under the two CSC slots in the CSC card cage, but are not part of the switch fabric.

Chassis Backplane

All of the card cages are tied together electrically through a passive system backplane in the back of the chassis. Nearly all of the wiring and circuitry in the chassis is contained within or connected to the chassis backplane. The chassis backplane distributes DC power to all of the cards in the chassis as well as the blower module, and provides the physical communication pathway between cards, both for network data and system communication across the internal system maintenance bus (MBus).

	Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
1-8	OL-11497-03