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You should be able to use a CSM-128 ATM Mux. It is a lower bandwidth ATM Mux that does not have an on board uplink. An interface on one of the supporting access modules is used as the uplink. This is normally an 8-Port DS1 IMA Module. You would be able to build an ATM PVC from the IMA group to the associated VP/VC on the EFM module. Note that you would potentially be creating a sugnificant "bottleneck" depending on the size of the EFM group.
We do not currently have a provisioning guide for this application. The best information can be gained by pulling provisioning information from the system manual (61181401L1-1A) and the 16-port EFM Module's Installation and Maintenance manual (61181429L3-5B). Both are posted on our website for registered users.