T640 T Series Control Boards (T-CBs) Description

• 100-MB Ethernet switch for intermodule communication.
• PCI bus to the Routing Engines.
• Processor subsystem (SPMB).

Figure 1 shows the T-CB.

Figure 1: T-CB

• The MASTER, FAIL, and OK LEDs, which indicate the status of the T-CB.
• Online/offline button.

  Note: When the adjacent Routing Engine is online, the online/offline button on the T-CB faceplate is nonfunctional. For more information, see Taking the T640 Host Subsystem Offline.

• Two RJ-45 ports labeled AUX and CIP on the T-CB faceplate.

  For T640 routers connected to a TX Matrix platform, only the CIP port is used. For more information, see the TX Matrix Router Hardware Guide .

• The M/S and CHASSIS ID configuration switches.
  • For a standalone T640 router, the M/S and CHASSIS ID configuration switches must always be set to S and 0.
  • For T640 routers connected to a TX Matrix platform, the M/S and CHASSIS ID configuration switches must always be set to M and the chassis identifier (ID) of the router. In this case, both T-CBs must have the same chassis ID. For more information, see the TX Matrix Router Hardware Guide .