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Cell Relay Retreat>ION Archive>month:1997-Apr> msg00093



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RBOCs Reaching Limits, DSLAM, xDSL, ATM, and IP

  • From: "James E. [Jed] Donnelley" <jed@llnl.gov>
  • Date: Tue, 22 Apr 1997 11:18:13 -0700 (PDT)
  • Cc: ion@nexen.com

Rajeev Kochhar <rxk@3com.com> wrote:

>Many companies are building devices called DSLAMs. You can consider these
>as modem banks for xDSL technology.

A useful document I found on:

Digital Subscriber Line Access Multiplexer (DSLAM)

is:

http://www.adsl.com/adsl/private/snag_wt.html#5.2

in the ADSL Service Network Architecture Group (SNAG)
documentation.

The figure that is at that anchored URL shows a variety
of local loop transport technologies bringing data
into the DSLAM, and then the data going out through
an ATM switch (or visa versa naturally).  I am a bit
surprised by this use of ATM.  Can somebody explain
to me what ATM adds to this mix?

In the approach I discussed before coming out of the
DSLAM (or something like it) would be a connection to
an IP router for feeding upstream and a POTS connection
into the existing POTS switched network.  What is wrong
with that picture?




Jed Donnelley    jed@llnl.gov   Phone: (510) 422-4309
http://www.webstart.com/jed/    FAX: (510) 423-1355