Specifications

Cable Installation and Interface Configuration 8-3

Configuring the HSSI Interfaces

Note In the Cisco 7206 and Cisco 7206VXR router shelves, you deﬁne interfaces by type and

physical shelf/port adapter/port locations. For information on Cisco 7206 and Cisco 7206VXR

router shelf physical port addresses, see the “Identifying Chassis Slot, Port Adapter Slot, and HSSI

Interface Port Numbers” section on page 8-4.

The following examples show the conﬁguration commands needed to prepare Cisco 7000 series,

Cisco 7200 series, Cisco 7500 series, Cisco uBR7200 series, and Cisco 7100 series routers for a null

modem cable connection:

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)#

Enter configuration commands...

For Cisco 7000 series and Cisco 7500 series:

Router(config)# interface hssi 1/0/0

Router(config-int)# hssi internal-clock

Router(config-int)# ^z

For Catalyst RSM/VIP2:

Router(config)# interface hssi 0/0

Router(config-int)# hssi internal-clock

Router(config-int)# ^z

For Cisco 7200 series, Cisco 7100 series and Cisco uBR7200 series:

Router(config)# interface hssi 1/0

Router(config-int)# hssi internal-clock

Router(config-int)# ^z

Note For the Cisco 7206 and Cisco 7206VXR router shelves, the interface speciﬁed in the

Cisco 7200 series example above would include a shelf number. For example, the command

interface hssi 5/1/0 would specify the ﬁrst HSSI interface of the port adapter in slot 1 of Cisco 7206

or Cisco 7206VXR router shelf 5.

Be sure to conﬁgure the HSSI port on both routers for an internal transmit clock. When the internal

clock is enabled, the TC LED on the PA-H goes on. When the internal clock is enabled in both

routers, the TC and RC LEDs on both of the connected HSSI ports go on.

When you disconnect the null modem cable, you must also disable the internal transmit clock with

the command no hssi internal-clock. Use this command to turn off the transmit clock for each port

on both routers.

This completes the procedure for attaching a null modem cable to your PA-H. Proceed to the next

section “Conﬁguring the HSSI Interfaces.”

Conﬁguring the HSSI Interfaces

If you installed a new PA-H or if you want to change the conﬁguration of an existing interface, you

must enter conﬁguration mode using the conﬁgure command. If you replaced a PA-H that was

previously conﬁgured, the system will recognize each new HSSI and bring it up in its existing

conﬁguration.