Telenetics 56 - Manual (Page 136)

AT Commands
Page 128
Modem Configuration
Modem performance will be improved by modification of your standard configuration; it
is recommended that the landline modem also be EC compatible for reliable
communications.
Cell Site AT&F
Base Site AT&F -SEC=1,18
MNP10-EC is automatically enabled on the cell side when a cellular phone driver is
loaded and the modem firmware detects that the cellular phone is attached, also in the
V.34 mode the modem is automatically configured to force the connection in V.32bis
mode.
On the cell side the transmit level is defined in the cellular driver, therefore it is not
necessary to set the level using the AT-SEC command.
In the V.34 mode, on the landline side, if MNP10-EC is disabled (AT-SEC=0), it will
automatically be enabled if another V.34 modem is calling (V.8bis/V.8 signal indicates
cellular capability). No particular modulation will be chosen on the land line side.
Therefore if a landside V.34 modem is NOT going to receive any calls from a V.32bis
MNP10-EC modem it can be configured using AT&F -SEC=0,18 , otherwise use the
configuration above.
If MNP10-EC is enabled manually (using AT-SEC=1,) no particular modulation will be
chosen; therefore, to force V.32bis modulation they should use the
AT+MS=10,1,minspeed,maxspeed command (e.g., AT+MS=10,1,4800,12000 would
force V.32bis and limit the speed between 4800 and 12000 bps). To allow V.34
modulation use AT+MS=11,1,minspeed,maxspeed (e.g., AT+MS=11,1,4800,19200
would allow V.34 speeds between 4800 and 19200).
When MNP10-EC is enabled in V.34 modes the symbol rate is limited to 3000, therefore
the maximum speed would be 26.4K however the initial connect speed is limited to
21600.
If an AXCELL™ solution is used, a transmit level of -10dBm is required, therefore the
following initialization string should be used:
Cell Site AT &F -SEC=1,10
It is recommended that systems be set up if possible with separate modems to receive
calls from other land based modems and cellular modems. This is so that land based users
that experience high network attenuation do not have connection problems when
communicating to modems configured for cellular operation.
The above configurations are the minimum additional AT commands may be issued to
change the result messages etc., AT&F is used to ensure that the modem is in a know
state.