Michael, at 11:30 on Aug 24 1996, you wrote to Bill Grimsley...

MR> Well I found out from my ISP but the BBS just won't reply (six messages 
MR> posted now). Off hand I would say it might be a Maestro or Banksia.

At the risk of offending some Maestro owners (so what else is new?), my
experiences with Banksia's V.34 modems have generally been good, but some
Maestros appear to suffer from the most peculiar problems, such as their
oft-faulty piezo "speakers" which, for some inexplicable reason,
stuffs up high-speed connects.  Their QA could do with some improvement,
IMO.

MR> BTW as a matter of interest Dynalink support have finally agreed that my 
MR> problems with connects are not my phone lines but possible incompatability 
MR> with a certain type/types of modem. 

That's extremely big of them, and certainly not before time either.

MR> When they tried to ring the BBS they couldn't get a connect at all, just 
MR> repeated negotiation (the same as I have with my ISP). An attempt using the 
MR> older 28800 Rockwell based Dynalink proved successful _every_ time. So 
MR> Dynalink are very keen to know what type of modem the BBS has.  The BBS is 
MR> QUANTUM LEAP ph 07 3805-1180.

There is no mention of the brand in his log-on screens, although the
Courier's aftercall stats indicate that it's probably a Rockwell-based V.34
modem, but neither a Spirit Viper nor a NetComm (no LAPM/SREJ).  I'd guess
a Maestro?

----------------------------------------
Data Compression         V42BIS 2048/32
Equalization             Long
Fallback                 Enabled
Protocol                 LAPM 128/15
Speed                    26400/28800
Modulation               V.34
Carrier Freq    ( Hz )   1829/1829
Symbol Rate              3200/3200
Trellis Code             64S-4D/16S-4D
Nonlinear Encoding       ON/ON
Precoding                OFF/ON
Shaping                  OFF/ON
Preemphasis     (-dB )   8/10
Recv/Xmit Level (-dBm)   36.4/12.8
SNR             ( dB )   35.2
Near Echo Loss  ( dB )   14.5
Far Echo Loss   ( dB )   29.7
Roundtrip Delay (msec)   3
----------------------------------------

Not some of the better figures I've seen lately, but the connect was quick
and clean, and that was with a basic &F1 init (nothing disabled).  I
also ran a line probe, and at around 3KHz, there was almost a bloody brick
wall, with line levels dramatically dropping to well below -40dBm above
that frequency.

BG> If you're seeing /ARQ connects, and not being tossed off, neither of the 
BG> above will make any difference in your case anyway.

MR> I'm seeing /ARQ connects alright but monly for 25 seconds :(

In that case, it could well be that he has retrains disabled at his end
(this was unfortunately the default with earlier Maestros, for example),
and when your Dynalink requests a retrain, the remote can't respond, then
drops carrier.  Adding %E2 or %E3 at his end should fix that problem (if
that's the cause).

MR> Dynalink couldn't shed any light on it.  Their support reckon they have 
MR> never had the need to disable the V42 detect phase. 

They like seeing 28800/NONE connects, do they?  What a bunch of morons. 
The simple fact is that some Rockwells DO have a dodgy implementation of
V.42, which is why disabling the USR's V.42 _detect_ phase solves that
problem (thereby forcing a non-negotiated LAPM connect).  It's a similar
problem to that of some Hayes models with their faulty 3429 symbol rate,
requiring said symbol rate to be disabled when calling these modems,
otherwise they simply won't connect.

MR> Correct me if I'm wrong but doesn't the courier have two separate S27 
MR> registers for disabling V42 and V42b detect phase - S27=48 disable V42 
MR> detect phase and S27=64 disable V42.

To avoid further long-winded comparisons between the Dynalink's and the
Courier's S-registers, here are the lot.  Please save this chart for future
reference, and refer to S27 in particular...

-------------------------------------------------------------------
S0  Ring to Answer On                  S36 Reserved
S1  Counts # of Rings                  S37 Reserved
S2  Escape Code Char                   S38 Disconnect Wait Time (sec)
S3  Carriage Return Char               S39 Reserved
S4  Line Feed Char                     S40 Reserved
S5  Backspace Char                     S41 # of Allowed Login Attempts
S6  Wait Time/Dial Tone (sec)          S42 Remote Escape Code Char
S7  Wait Time/Carrier (sec)            S43 Remote Escape Code Time (1/50sec)
S8  Comma Time (sec)                   S44 Leased Line Delay Timer (sec)
S9  Carrier Detect Time (1/10sec)      S51 Bit Mapped
S10 Carrier Loss Time (1/10sec)              1 = MNP/V.42 Disabled in V.22
S11 Dial Tone Spacing (msec)                 2 = MNP/V.42 Disabled in V.22bis
S12 Escape Code Time (1/50sec)               4 = MNP/V.42 Disabled in V.32
S13 Bit Mapped                               8 = Reserved
      1 = Reset On DTR Loss                 16 = Reserved
      2 = Do Originate in Auto Answer       32 = Reserved
      4 = No Pause Before Result Codes      64 = Disable Selective Reject
      8 = Do DS0 On DTR                    128 = Enable phone exclusion delay
     16 = Do DS0 On Reset              S53 Bit Mapped
     32 = Disable HST                        1 = Enable Dial Security
     64 = Disable MNP Level 3                2 = Enable Autopass Fallback
    128 = Hardware Reset                     4 = Enable Local Access Psw
S14 Bit Mapped                               8 = Reserved
      1 = Escape Code Hang Up               16 = Reserved
S15 Bit Mapped                              32 = Reserved
      1 = Disable High-Freq EQ              64 = Reserved
      2 = Disable Online Fallback          128 = Reserved
      4 = Disable 450 bps Back Channel S54 Bit Mapped
      8 = Reduced Non-ARQ TX Buffer          1 = Disable 2400 symbol rate
     16 = Disable MNP Level 4                2 = Disable 2743 symbol rate
     32 = Set DEL=Backspace                  4 = Disable 2800 symbol rate
     64 = Unusual MNP-Incompatibility        8 = Disable 3000 symbol rate
    128 = Custom Applications               16 = Disable 3200 symbol rate
S16 Test Modes                              32 = Disable 3429 symbol rate
      1 = Analog Loopback                   64 = Disable V.8 Call Indicate
      2 = Dial Test                        128 = Disable V.8 Mode
      4 = Test Pattern                 S55 Bit Mapped
      8 = Remote Digital Loopback            1 = Disable 8S-2D trellis code
     16 = Reserved                           2 = Disable 16S-4D trellis code
     32 = Reserved                           4 = Disable 32S-2D trellis code
     64 = Reserved                           8 = Disable 64S-4D trellis code
    128 = Reserved                          16 = Reserved
S17 Reserved                                32 = Reserved
S18 &Tn Test Timeout (sec)                  64 = Reserved
S19 Inactivity Timeout (min)               128 = Enable phase roll detection
S20 Reserved                           S56 Bit Mapped
S21 Break Length (1/100sec)                  1 = Disable nonlinear coding
S22 Xon Char                                 2 = Disable TX level deviation
S23 Xoff Char                                4 = Disable preemphasis
S24 DSR Pulse Time (1/50sec)                 8 = Disable precoding
S25 DTR Recognition Time (1/100sec)         16 = Disable shaping
S26 RTS/CTS Delay Time (1/100sec)           32 = Disable V34+
S27 Bit Mapped                              64 = Disable V34
      1 = V21 Mode                         128 = Disable VFC
      2 = Disable TCM                  S57 Reserved
      4 = Disable V32                  S69 Bit Mapped
      8 = Disable 2100hz                     1 = Disable Extrn. PnP
     16 = Disable MNP Handshake              2 = Enable Auto Redial
     32 = Disable V.42                       4 = Reserved
     48 = Disable V.42 Detect Phase          8 = Reserved
     64 = Reserved                          16 = Reserved
    128 = Unusual SW-Incompatibility        32 = Reserved
S28 V32 Handshake Time (1/10sec)            64 = Reserved
S29 Reserved                               128 = Reserved
S30 Reserved                           S70 Bit Mapped
S31 Reserved                                 1 = Enable ring type A
S32 Talk/Data Switch                         2 = Enable ring type B
      0 = Disabled                           4 = Enable ring type C
      1 = Originate Mode                     8 = Enable ring type D
      2 = Answer Mode                       16 = Reserved
      3 = Redial Last Number                32 = Reserved
      4 = Dial Stored Number 0              64 = Reserved
      5 = Auto Answer Toggle               128 = Reserved
      6 = Reset Modem
      7 = Initiate RDL
      8 = Busy Toggle
      9 = Execute Stored Cmd
S33 Reserved
S34 Bit Mapped
      1 = Disable V32bis
      2 = Disable Enhanced V32 mode
      4 = Disable Quick V32 retrain
      8 = Enable V23 Fallback
     16 = Change MR to DSR
     32 = Enable MI/MIC
     64 = Disable RA Busy Msg
    128 = Disable Terbo
S35 Reserved
----------------------------------------------------------------------

MR> With the Dynalink the modems built in help has _no_ S registers which state
MR> "Disable V42 detect phase".  S15=128 is "Disable
V42" no mention of it 
MR> being Detect phase.

I'm buggered if I know either, but there's a pretty easy way to find out;
simply call Dave's Courier with S15=128 in your dialling string, and if it
connects with LAPM, that bit only disables the detect phase.  If you see an
MNP4 connect, it has disabled LAPM only, and if you see no error correction
at all, then it will have quite obviously disabled V.42 altogether.

Regards, Bill
@EOT:

--- MsgedSQ/2 3.50