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echo: locsysop
to: Bill Grimsley
from: Rod Speed
date: 1996-03-15 11:50:08
subject: Modem trio

PE> And I don't know how you know what transmit levels the
PE> Courier was putting out compared to the Netcomm either.

RS> Its shown in the session stats,

RS> Recv/Xmit Level (-dBm)   26.6/12.9

BG> FWIW, the second figure above is the USR's Tx level, while
BG> the first is the NetComm's Tx level with the total line losses
BG> included (as seen by the USR). Ergo, if you know the M34F is
BG> transmitting at -11dBm, you also know that there is an overall loss
BG> between the modems of 15.6dB.

Well, thats the theory anyway. I think that Recv figure is just as
bogus when its not a USR as the db figures on the line probe table.

The evidence for that is that when its a USR on the other end, and
we can see what IT claims its transmitting at, and then calculate
the line loss, we get a DIFFERENT line loss, 6db different in fact.

Something extremely fishy going on there somewhere. Corse we dont
actually KNOW that the Netcon is putting out -11dbm when it claims
it is, but its unlikely to be 6db out, thats a hell of a lot.

BG> And THAT would be in excess of Telstra's own
BG> maximum accepted level between subscribers...

But NOT with a USR/USR pair, so it cant really be true.
@EOT:

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