TIP: Click on subject to list as thread! ANSI
echo: aust_modem
to: Paul Edwards
from: Bill Grimsley
date: 1996-02-03 13:09:12
subject: USR Courier V34 problems

Paul, at 06:12 on Feb 02 1996, you wrote to Russell Brooks...

PE> Freq     Level
PE>  150     27
PE>  300     18
PE>  450     17
PE>  600     17
PE>  750     17
PE>  900     17
PE> 1050     18
PE> 1200     18
PE> 1350     18
PE> 1500     19
PE> 1650     19
PE> 1800     20
PE> 1950     20
PE> 2100     21
PE> 2250     21
PE> 2400     22
PE> 2550     22
PE> 2700     23
PE> 2850     23
PE> 3000     23
PE> 3150     24
PE> 3300     24
PE> 3450     27
PE> 3600     33
PE> 3750     44

Those are actually quite good figures, Paul, particularly at the higher end
of the frequency range.  Good enough for a 31200 or 33600 connect too.

PE> CONNECT 31200/ARQ/V34/LAPM/V42BIS

Well, there you go then.  :)

PE> Modulation               V.34+
PE> Carrier Freq (Hz)        1829/1829
PE> Symbol Rate              3200/3200
PE> Trellis Code             64S-4D/64S-4D
PE> Nonlinear Encoding       ON/ON
PE> Precoding                ON/ON
PE> Shaping                  OFF/OFF
PE> Preemphasis (-dB)        4/6
PE> Recv/Xmit Level (-dB)    21/15
PE> Roundtrip Delay (msec)   4

Russell might suggest that the Tx level is a tad low, but given the overall
results, those figures are more than acceptable, especially the Rx level.

PE> Speed                  28800/26400

Interesting that the link rate should have actually dropped towards the end
of the call, although it's not overly uncommon.

Regards, Bill

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