david, at 21:26 on Feb 26 1996, you wrote to Bill Grimsley...

db>> 'cept me - I'm getting "Connect
28800/Lap-M/V.42Bis/V.34" each and
db>> every time now, with no failed connections. 
BG>
BG> With NetComm to NetComm, I'd expect nothing else.  :)

db> Oh YEAH?!?!  ;-)

Of course!  I'd expect that any two modems of the same type should give
better results than two totally different models.

BG> It could indeed be related to his lines.  Seen my aftercall stats yet?

db> Yep - whilst some of 'em are obvious, let's actually start *explaining* 'em 
db> in *detail* so that we can see *precisely* what's going on.  I'm just 
db> guessing when I look at those since I don't have a USR modem, nor am I used 
db> to getting such detailed line information out of a modem.

These figures are the easiest to interpret...

# 25 Feb 09:58:12.16 Freq     Level
# 25 Feb 09:58:12.16  150     40
# 25 Feb 09:58:12.19  300     29
# 25 Feb 09:58:12.19  450     27
# 25 Feb 09:58:12.22  600     27
# 25 Feb 09:58:12.25  750     27
# 25 Feb 09:58:12.25  900     27
# 25 Feb 09:58:12.28 1050     28
# 25 Feb 09:58:12.28 1200     28
# 25 Feb 09:58:12.31 1350     29
# 25 Feb 09:58:12.35 1500     30
# 25 Feb 09:58:12.35 1650     31
# 25 Feb 09:58:12.38 1800     31
# 25 Feb 09:58:12.38 1950     32
# 25 Feb 09:58:12.41 2100     33
# 25 Feb 09:58:12.41 2250     34
# 25 Feb 09:58:12.44 2400     35
# 25 Feb 09:58:12.47 2550     35
# 25 Feb 09:58:12.47 2700     36
# 25 Feb 09:58:12.50 2850     37
# 25 Feb 09:58:12.50 3000     38
# 25 Feb 09:58:12.53 3150     39
# 25 Feb 09:58:12.53 3300     41
# 25 Feb 09:58:12.56 3450     44
# 25 Feb 09:58:12.60 3600     50
# 25 Feb 09:58:12.60 3750     59

Basically, once the level drops below around -35dBm for a given frequency
(could be marginally higher at -33dBm, I'm not sure), the modems should
shift down to the next highest freq/level pair, and the above stats
indicate that the highest carrier frequency for a successful link is around
2250Hz, say 21600 or 24000 bps (or a step higher on modems supporting
64-state trellis coding).

db> BTW, I just confirmed with NetComm today that the M34F upgrade to V.34bis 
db> (their title, not mine - I asked about "V.34+")

The "V.34+" was basically USR's own working name for what will
soon be ratified as V.34bis by the ITU-TSS (July 1996 is the expected
date).

db> will definitely require a Rockwell chipset replacement.  Gloat mode
"on"...  
db> ;-)

That was common knowledge, so no surprises there at all.  No gloating
either, although now that USR are about to release their latest Courier
flash-ROM which now supports such goodies as carrier loss redial,
distinctive ring, and Caller ID, one could certainly be tempted...  :)

BG> Just as long as somebody walks away with his M34F...  :)

db> What, no sacrificial ropeless bungee from the window?!?!  ;-)

No, I'm not that cruel.  Unless, of course, you meant for Paul...  :)

Regards, Bill

--- Msgedsq/2 3.20