* Reply to msg in USR_MODEMS

On 1996-03-08 12:50, Joe Frankiewicz of 1:115/500 wrote:

-> 1.  What EXACTLY does ATY11 measure ?

JF> It measures the RX levels of a set of specific frequency tones which are
JF> sent during the V.34 handshake sequence.  These RX levels are used to
JF> determine the frequency response characteristics of the channel, which
JF> in turn affects V.34's selection of carrier frequency and symbol rate.

-> 2.  Why is there such a VAST difference between USR & Rockwell ?

JF> That depends on what kind of difference you mean.   If the rolloff is
JF> the same general "shape", but the overall levels are different, that
JF> would indicate that the remote modems are using different transmit
JF> levels.

JF> If the rolloff "shape" is different, that would indicate
that individual
JF> calls are being routed through different circuits, or the remote modem
JF> is having a v.34 parameter negotiation problem.

JF> Joe

Here is possibly an explanation for the different levels.  Possibly
with a capital P.  BFN.  Paul.
@EOT:

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