In a message dated 08-10-96, Bill Grimsley said to Michael Raiteri:

BG>Michael, at 10:22 on Aug 07 1996, you wrote to Tom Przeor...

BG>Has it not yet occurred to you that your phone lines are probably the cause 
BG>of your less-than-optimal connects?  To settle this 

Yes it has but I doubt there is anything I can do about it.

BG>argument once and for all, drop into on-line command mode 
BG>during one of your poorer connect (+++), wait for the OK 
BG>response, then type ATY11.  Return on-line with ATO2, which 
BG>will force a retrain (this generally improves your current 
BG>link rate).  Capture and post the resulting frequency/line 
BG>level chart, and all will be revealed.

Done it. Firstly from Paul Marwicks BBS
aty11

Freq         Level (dB)

150           34
300           24
450           23
600           23
750           23
900           23
1050          24
1200          24
1350          25
1500          25
1650          26
1800          26
1950          27
2100          27
2250          27
2400          28
2550          28
2700          29
2850          29
3000          30
3150          31
3300          32
3450          35
3600          39
3750          47
OK
ato2
ERROR
ato
CONNECT 26400/ARQ/V34/LAPM/V42BIS

and after that call

ati6i11
Texas Instruments RK 33600 Fax Link Diagnostics...

Chars sent                  555      Chars Received          2597761
Chars lost                    0
Octets sent                 520      Octets Received         2613950
Blocks sent                 174      Blocks Received           22145
Blocks resent                 0

Retrains Requested            2      Retrains Granted              0
Line Reversals                0      Blers                        20
Link Timeouts                 1      Link Naks                     0

Data Compression       V42BIS 2048/32
Equalization           Long
Fallback               Disabled
Protocol               LAPM
Speed                  28800/26400 
Last Call              00:23:26

Disconnect Reason is DISC Received

USRobotics Sportster 33600 V.34+ Fax Link Diagnostics ...

Modulation                  V.34
Carrier Freq     (Hz)       1959/1959
Symbol Rate                 3429/3429
Trellis Code                64S-4D/64S-4D
Nonlinear Encoding          ON/ON
Precoding                   ON/ON
Shaping                     ON/ON
Preemphasis      (-dB)      6/6
Recv/Xmit Level  (-dBm)     27/11
SNR              (dB)       29
Near Echo Loss   (dB)       27
Far Echo Loss    (dB)       56
Round Trip Delay (msec)     4

OK

Then from David Drummonds BBS

OK
ATY11

Freq         Level (dB)

150           33
300           22
450           21
600           21
750           21
900           22
1050          22
1200          23
1350          23
1500          23
1650          24
1800          25
1950          25
2100          25
2250          26
2400          26
2550          27
2700          28
2850          28
3000          29
3150          29
3300          30
3450          32
3600          37
3750          46
OK
ATO
CONNECT 28800/ARQ/V34/LAPM/V42BIS
 
and after the call

ATI6
Texas Instruments RK 33600 Fax Link Diagnostics...

Chars sent                  135      Chars Received           149984
Chars lost                    0
Octets sent                 149      Octets Received          140763
Blocks sent                  33      Blocks Received            2412
Blocks resent                 0

Retrains Requested            1      Retrains Granted              0
Line Reversals                0      Blers                         0
Link Timeouts                 0      Link Naks                     0

Data Compression       V42BIS 2048/32
Equalization           Long
Fallback               Disabled
Protocol               LAPM
Speed                  33600/28800 
Last Call              00:04:18

Disconnect Reason is DISC Received

OK
ATI11
USRobotics Sportster 33600 V.34+ Fax Link Diagnostics ...

Modulation                  V.34+
Carrier Freq     (Hz)       1959/1959
Symbol Rate                 3429/3429
Trellis Code                64S-4D/64S-4D
Nonlinear Encoding          ON/ON
Precoding                   ON/ON
Shaping                     OFF/ON
Preemphasis      (-dB)      6/4
Recv/Xmit Level  (-dBm)     26/10
SNR              (dB)       39
Near Echo Loss   (dB)       26
Far Echo Loss    (dB)       54
Round Trip Delay (msec)     3

OK

BG>Additionally, directly following said call, issue ATI6I11 
BG>and post those figures as well.  If your S/N ratio is less 
BG>than say 38db, it ain't the modem which is at fault.  
BG>There's not much point in having USR's wonderful link 
BG>diagnostics screens if you're not going to make use of them.

Unfortunately I haven't the faintest idea what most of the stats mean. One I am
interested in is FALLBACK=DISABLED. What sort of fallback would that be and is
that the default.

BTW on each of these calls I was using Dynalinks recommended init string of
AT&F1&H1&R2X1.

MR> Would you mind sharing your settings/init string with me as it may be the
MR> answer to many a prayer.

BG>Apart from the occasional outbound call where you may need to disable the 
BG>V.42 detect phase, or the 3429 symbol rate (notably with 
BG>some Hayes V.34 modems), a simple AT&F1&K0 is still the 
BG>optimal init$ for the Dynalink with dodgy BTLZ.  

Dynalink don't agree and my ISP reckons that I _have_ to have V.42 enabled for
their modems (still trying to find out what sort they are)

Hope you can shed some light on this for me Bill.

Cheers
Mike
Internet: mraiteri{at}dyson.brisnet.org.au
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