Troubleshooting PULSE-TIME command

[csmiler]

We are trying to troubleshoot a fielded problem where Router-to-KIV7HSB does not sync back up when the WAN link drops or flaps. We began to investigate the pulse-time command to set a signal high on the KIV device to resync automatically.Does the pulse-time command on a serial interface actually do anything to send signals to the next connected device? When is the command effective, on WAN DSU/CSUs, on ISDN Modems, on PSTN Modems connection? We have scoped it and tested it but still there is no consensus at my lab between engineers.

[smothuku · Accepted solution]

Hi ,

When the serial line protocol goes down (for example, because of loss of synchronization), the interface hardware is reset and the DTR signal is held inactive for at least the specified interval. This function is useful for handling encrypting or other similar devices that use the toggling of the DTR signal to resynchronize.

Use the optional msec keyword to specify the DTR signal interval in milliseconds. A signal interval set to milliseconds is recommended on High-Speed Serial Interfaces (HSSIs).

Examples

The following example enables DTR pulse signals for 3 seconds on serial interface 2:

Router(config)# interface serial 2

Router(config-if)# pulse-time 3

The following example enables DTR pulse signals for 150 milliseconds on HSSI interface 2/1/0:

Router(config)# interface hssi 2/1/0

Router(config-if)# pulse-time msec 150

check out below link.

http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124tcr/tir_r/int_m1ht.htm#wp1005101

Thanks,

satish