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