T320 T-CB Description
This chassis supports up to two control boards. The Routing Engine requires an adjacent control board to provide control and monitoring functions for the router (see Figure 1). These functions include determining Routing Engine mastership; controlling power and reset for the other router components; monitoring and controlling fan speed; and monitoring system status.
You can install up to two control boards in the router. Control boards install into the upper rear of the chassis in the slots labeled CB0 and CB1 (referred to as CB-0 and CB-1, top to bottom). If two control boards are installed, one functions as the master and the other as its backup. If the master fails or is removed, the backup restarts and becomes the master.
Each control board requires a Routing Engine to be installed in the adjacent slot. CB0 installs above RE0, and CB1 installs below RE1. Control boards can not function if a Routing Engine is not present in the adjacent slot.
If the host system is redundant, the backup control board is hot-removable and hot-insertable, but the master control board is hot-pluggable. A control board that is not redundant is hot-pluggable.
Each consists of the following components:
- 100-MB Ethernet switch for intermodule communication.
- PCI bus to the Routing Engines.
- Processor subsystem (SPMB).
- Three LEDs, located on the control board faceplate, indicate its status.T320 T-CB LEDs describes the functions of the control board LEDs.
- The control board online/offline button, located on the its faceplate. This button is not functional.
- Two configuration switches, located on the T-CB faceplate. On the T320 router, the M/S and CHASSIS ID switches must always be set to S and O.
- Two RJ-45 ports labeled AUX and CIP on the T-CB faceplate. These ports are not used in a T320 router.
Figure 1: T320 control board
