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WIC-2T issue with Tellabs LL modem


i have a 2811 (Advance IP services IOS) with 4 Nos of WIC-2T connected to Tellabb 8110 Leased line modem at HO and Cisco 1841 (Advance IP services IOS) with WIC-1T connected to Tellabs 8110 modem.

In the above scenario, there is no communication between HO router and Branch router.

But i insert WIC-1T card on HO router (2811) the communication is happening.

Is there any specific configuration needs to be done in Tellabs 8110 modem to connect Smart serial cable?

I also suspect the issue with WIC-2T cards (on 2811). but i have 4 Nos of WIC-2T, all are giving the same issue.

Can anyone suggest me with the solution?

Thanks in advance....

- Arjun