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Cell Relay Retreat>List Archive>month:1997-Jul> msg00165



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ATM Cable Modem MPOA Transfer Rates

  • From: Joe Lutz <Joe.Lutz@lmco.com>
  • Date: Mon, 28 Jul 1997 08:41:39 -0700

For a current project I am integrating a prototype atm cable modem into
an internet access architecture.  Our ATM edge device is a Cisco 7513
router with an AIP (atm interface processor) card that interfaces to the
propritary atm network that transports ip data from the head end
downstream to the home.  The ethernet side of the router is 10bT or
100bT to a Sun server.  Down stream at the subscriber home the
connection is made to the PC's enthernet NIC via 10bT from the external
cable modem.  The ATM connection is a PVC with RFC-1483 bridging
carrying the ip traffic.

The problem: When the server is connected to router via 10bT no problem.
When the server is connected to the router via 100bT throughput to the
PC decreases by an order of magnitude.  The ATM network seems to choke
on the higher rate.


Rate matching/flow control issues?  Anyone have some thoughts on this? 

Thanks .. Joe L.