Comtrol AT Commands for SmartACFL - Manual (Page 99)

Command Reference Manual
100722A Conexant 3-79
3.4.2.3 ^T6 - Indicate Status of Cellular Phone
The status of the cellular phone connected to the modem is reported in response to the ^T6 command. The status is reported
in a single byte formatted as a decimal number. The individual status signals assigned to the status byte bits are:
bit 0 1 = Cellular phone is receiving an incoming call
bit 1 1 = Cellular phone is in use
bit 2 1 = Cellular phone is locked (cannot be used)
bit 3 1 = There is no service for cellular phone (does not indicate signal strength)
bit 4 1 = Cellular phone is powered on
bit 5 1 = Cellular driver is initialized
bit 6 0 = Reserved (0)
bit 7 1 = Cellular cable detected
Result Codes (typical):
128 (Cellular cable detected)
OK
Application of ^T6 Status Byte
The information obtained by issuing a AT^T6 can be used to determine if the loading of the cellular phone driver is necessary
by the host software. A download is not necessary if landline (or no cable) is connected to the modem, in which ^T6 will return
a value of 0 (bit 7=0). A download is necessary when a cellular cable is detected (implied cellular phone is also connected), in
which ^T6 will return a value of 128 (bit 7=1). Once a driver is downloaded to the modem, it will be able to operate in landline
or cellular mode based on detection of a cellular cable.
3.4.3 Operation
Once the driver is loaded and the modem is connected to the cellular phone, and the phone is powered on dial/answer
functions will be routed through the phone instead of the landline DAA, i.e., no special commands are needed to place or
answer calls, the same AT commands and software packages that are used for landline communication sessions can be
used. If the cellular phone is not connected or is powered off dial/answer functions will be routed through the landline DAA,
and if V.42 bis connection is established the cellular phone driver will be purged so that the V.42 bis dictionaries can be
increased to their normal size.
While the modem is being used with a cellular phone it will respond with normal result messages with the following
differences in meaning:
NO DIAL TONE Indicates that cellular service is not currently available.
RING Indicates that the cellular phone is receiving an incoming call.
3.4.3.1 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.8 bis/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 if the user wishes 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.