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ATM AIM Modules

Level 1
Level 1

I am installing 3 times VWIC2-2MFT-T1/E1 in a 3825 to provide 6 E1 connections running ATM PVC's. I will have 2 times AIM ATM installed in the router as each AIM ATM will only support a maximum of 4 E1's. I need to split my E1 ATM links into 2 bundles of 3 and therefore will need to split the two E1 interfaces on one of my VWIC2-2MFT-T1/E1's across 2 AIM ATM's. i.e. controller E1 0/2/0 will be on atm aim 0 and controller E1 0/2/1 will be on aim atm 1.

Will this configuration work?

Am I likely to encounter any timing problems?

4 Replies 4

Giuseppe Larosa
Hall of Fame
Hall of Fame

Hello Steve,

about clocking it cannot be independent on each port for the ATM IMA


The Cisco 2-port MFT VWIC2s also can enable each port to be clocked from independent clock sources for data applications. This independent clocking capability is not supported for voice applications or with the Cisco ATM/Voice Advanced Integration Modules (part number AIM-ATM, AIM-VOICE-30, AIM-ATM-VOICE-30).

and about clocking concepts and options

and for IMA groups

see section

Configuring IMA Groups

under the controller E1 you specify

mode atm aim aim-slot-number

this should solve the question of how to associate 3E1 to one AIM and 3 to the other one

Hope to help


Hi Giuseppe,

thanks for the feedback. I have had a look at the links that you attached have produced a propsoed config which I have attached below. Please have a look and let me know if this looks OK?



Hello Steve,

your configuration looks like a good starting point.

the PVCs then will be defined under the atmx/imay object.

Hope to help


Thanks Giusppe,

I am happy with the sub-interface and PVC configuration, it was the AIM ATM, and clocking setup I was not clear on, but I think you have sorted that out for me now.

I will be setting this up mid-January when I go out to Mauritius. We would normally use MPLS, but the telco doesn't offer a layer 3 MPLS service yet, hence the need for E1's and ATM.

Thanks again,



Thanks again


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