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RE: [EFM] Re: Loopback and BERT


Correct. The introduction of errors comes from the BERT engine at the POP
end, and potentially from the BERT engine in the CPE, if the implementer
chooses to support that in the CPE. The inexpensive BERT chips support all
of that 'stuff', and one of the BERT chip vendors does a pretty good job on
10/100 PHY/MAC chips too, so I would hope that they would support this



-----Original Message-----
[]On Behalf Of Roy Bynum
Sent: 24 February 2002 22:07
Subject: RE: [EFM] Re: Loopback and BERT


One function that was always part of BERT testing when I was working in
field operations was the deliberate introduction of errors in the encoded
data stream to be sure that the customer premise equipment was properly
able to detect errors.  This is part of the originating conformance
testing, and part of the conformance testing that was done after a
repair.  I do not think that your "loop back plug" would qualify for that
level of conformance BERT testing.

Thank you,
Roy Bynum

At 08:55 PM 2/24/2002 +0000, Bob Barrett wrote:

>Dear all
>Rather than put up a presentation on this at the March meeting I have
>written a white paper expressing what I think are the key issues (and the
>key reasons and benefits) of including loopback and BERT functions in the
>EFM subscriber access standard. It can be found at:
>or from a link at
>I have written this as an individual, and not included references to my
>company or products, and I have put it on my personal web site. Inevitably
>do mirror my views into the technolgy that my company produces, as do most
>of we equipment vendors.
>By putting this paper up for discussion now I hope to reach the broad
>audience of all EFM streams and stimulate debate in advance of the March
>meeting, to help us to reach consensus.
>Bob Barrett