Hi,

The output for 'show commands' are attached along with this post. Thank you for the note, which I forgot mention in my initial post that the clock source internal has been configured on only one router.

On both routers, under interface serial 'no shutdown' command was issued.

I am not able to ping to peer end router and the local serial interface of router as well. It will be great if you can help out.

Thanks,

Bhushan

In your attached text file you have the output of one of the routers:

Router#show controller e1 0/2/0
E1 1/0 is up.
Applique type is Channelized E1 - balanced
No alarms detected.
alarm-trigger is not set
Version info Firmware: 20011109, FPGA: 15
Framing is CRC4, Line Code is HDB3, Clock Source is Line.

If on both routers you have exactly the same status, than it's not good. I hope that if you do the show controller e1... command on the other router is showing Clock Source is Internal. Does it?

Second, try to change the encapsulation to PPP, just to see if you still get the UP/UP status for the interfaces.

If on both routers you have exactly the same status, than it's not good.
 I hope that if you do the show controller e1... command on the other 
router is showing Clock Source is Internal. Does it?

OP has stated already that is the case, please read above.

Hi,

I was trying to fix this problem from past few days, unfortunately with no success. Since I was doing the configuration of T1/E1 for the first time, it took some time.

While going through some of the documents, I have read about using RJ-48 cable for connecting T1/E1 cards on two routers back to back. So, following that document I have used a RJ-48 cable between 2 routers.

Two routers are configured in the following way after that.

RouterA

RouterA(config)#controller e1 0/1/0

RouterA(config-controller)#framing crc4

RouterA(config-controller)#linecode hdb3

RouterA(config-controller)#clock source internal

RouterA(config-controller)#channel-group 0 timeslots 1-31

RouterA(config)#interface serial 0/1/0:0

RouterA(config-if)#ip address 192.168.1.1 255.255.255.252

RouterA(config-if)#encapsulation ppp

RouterA(config-if)#no shut

RouterB

RouterB(config)#controller e1 0/1/0

RouterB(config-controller)#framing crc4

RouterB(config-controller)#linecode hdb3

RouterB(config-controller)#channel-group 0 timeslots 1-31

RouterB(config)#interface serial 0/1/0:0

RouterB(config-if)#ip address 192.168.1.2 255.255.255.252

RouterB(config-if)#encapsulation ppp

RouterB(config-if)#no shut

After doing these configurations, ping was successful between routers. I guess the problem was with 'framing' configuration under controller. In order to cross check, I have changed framing to no-crc4. It created the same problem again (not able to ping local serial interface as well as the peer end serial interface).

So, reverting back the 'framing' configuration to CRC4 worked fine.

For time being, the configuration is working fine. But I would like to understand the concept behind it so that it helps me in future.

Any how, I would like to thank you both for your timely help. Your guidance also helped me a lot to narrow down to possibilities for the problem encountered.

That's strange, framing as long set congruently, should not affect operation.