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Cell Relay Retreat>List Archive>month:1998-Jun> msg00133



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Inverse Multiplexing over ATM (IMA)

  • From: crystal <crystal@postme.net>
  • Date: Fri, 26 Jun 1998 10:38:36 -0700

3com has release the Inverse Multiplexing over ATM (IMA) modules for
their ATM switches. IMA gives T1/E1 lines over WAN network points. It
works by assigning mutiple phone lines to a single stream of ATM cells.
Each T1/E1 analog line is a standard ATM UNI link, with the combined
total of mutiple T1/E1 lines as the total bandwidth of the WAN link
between IMA switches at both ends of the connections.

Based on the CES1.0 ATm standard. The currently max is in pairs from 2,
4 to 8 T1/E1 analogue lines. (approx 3-16Mbps)

        * Can this IMA be applied to OC-3 (155Mbps) and OC-12 (622Mbps) 
          links? These are digital links that are ATM specs.
        * Can inverse multiplexors be used between ethernet switches?
          CSMA/CD protocols. Say, a Gigabit (1000Mbps) switch using 
          inverse multiplexors over several T4/E4 (132/144Mbps) lines,
          with a complimentary inverse multiplexor and a ethernet 
          switch.  
          
Best Regards,
Crystal.