PE> * Reply to msg in USR_MODEMS

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

BG> 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.

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

Bill should have sent him both sets of data. Thats an
awfully unspecific statement about what the difference is.

JF> That depends on what kind of difference you mean.

JF> If the rolloff is the same general "shape", but the
JF> overall levels are different, that would indicate that
JF> the remote modems are using different transmit levels.

This is whats happening, but he isnt aware that its a 6db shift
of the entire curve. Thats a HELL of a shift, claiming that
the M34F puts out VASTLY different levels than a Courier does.

We KNOW that there isnt much in it on the transmit level tho between
the M34F and Courier at Pauls coz the transmit level is ALSO listed.

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

This one isnt happening.

PE> Here is possibly an explanation for the different levels.
PE> Possibly with a capital P.

God knows what you thing that means, usual Paul Edwards cryptic.
@EOT:

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