On Feb 02, 1996 at 22:13, Frank Malcolm of 3:711/934.24 wrote:

 DB>> Braindead Spirit.  Ignore the manual and enter "ATB15!" anyway.
 FM>
 FM> I decided to try it anyway. Did you mean to include the "!"?

Yes.

 FM> It doesn't like that. Neither does it like any 2-digit numbers.

As I said, "Braindead Spirit."  ;-)  (Shouldn't talk too much -
M34F still doesn't like any commands after the "Z" in a single AT
command string.)

 FM> But it accepts (replies OK) ATB0 up to ATB9. What do (might) these
 FM> numbers mean?

The "!" means *lock* the connection rate (accept no substitutes),
while the "ATB" numbers determine the originating connection rate
(and answering if you're accepting calls).  You generally don't need to
play with this, but it's there for fine tuning in case you need it.

The table from my EPROM help screen is (small formatting mods to fit screen
and no wrap):

B    Set Modulation Standard and Autorange
   Bn         Originate Speed            Answer Speed
        300  1200  2400  9600 19.2k+
   0 =  V21  V23   V22b  V32  Vfast-AUTO AUTO  See also #B commands
   1 =  103  212   V22b  V32  Vfast-AUTO AUTO  AUTO will connect to best 34/FC
   2 =  V21  V22   V22b  V32  Vfast-AUTO AUTO    ..V32b V32 V22b V22 V23 V21..
   3 =  V21                              V21     ..Bell212A Bell103
   4 =  103                              103
   5 =       V23                         V23
   6 =       V22                         V22
   7 =       212                         212
   8 =       V22  V22b                   V22b       V22b = V22bis
   9 =    AUTO
  10 =                   V32  4.8k       V32  4.8k
  11 =                   V32b 7.2k       V32b 7.2k
  12 =                   V32U 9.6k       V32U 9.6k  V32U = Non-TCM V32
  13 =                   V32  9.6k       V32  9.6k
  14 =                         V32 12k   V32 12.0k
  15 =                         V32b14.4k V32 14.4k
  V.34 speeds: B setting limits maximum connect speed
  Modem will automatically select highest useable speed on each connection
  16 = 14.4k  17 = 16.8k  18 = 19.2k  19 = 21.6k  20 = 24.0k
  21 = 26.4k  22 = 28.8k  27-31 sets 2.4k-12k V.34 speeds (AUTO)

 FM> What have I stuffed up? Hopefully nothing, as I did ATZ after playing.

Precisely.


    - dave
    d.begley{at}ieee.org

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