Sony Ericsson TT4031 (SE-GM29) - Manual (Page 19)

Owner’s Manual Rev 1.0 Page 19 of 19
GSM network (for example, traffic reports). This feature is
network dependent.
SMS STATUS REPORT according to GSM 03.40.
SMS COMMAND according to GSM 03.40.
The maximum length of an SMS message is 160 characters when using 7-
bit encoding. For 8-bit data, the maximum length is 140 characters. The
modem supports up to 6 concatenated messages to extend this function.
2.4.3 Voice Calls
The TT4031 (SE-GM29) offers the capability of mobile originated and
mobile terminated voice calls, as well as supporting emergency calls.
Multiparty, call waiting and call deflection features are available. Some of
these features are network-operator specific.
For the inter-connection of audio, the modem offers a balanced 4-wire
analogue interface.
DTMF (Dual Tone Multi Frequency) is supported.
2.4.4 Data
The modem supports the following data protocols:
GPRS (General Packet Radio Service).
Modems are Class B terminals, which provide simultaneous
activation and attachment of GPRS and GSM services. TT4031
(SE-GM29) modems are GPRS class 8 (4+1) enabled devices,
which are capable of transmitting in one timeslot per frame (up
link), and receiving at a maximum of four timeslots per frame
(down link).
CSD (Circuit Switched Data).
TT4031 (SE-GM29) modems are capable of establishing a CSD
communication at 9.6 kbps.
HSCSD (High Speed Circuit Switched Data).
TT4031 (SE-GM29) supports HSCSD class 2 (2+1)
communication, with one timeslot per frame capacity in the up
link and two timeslots per frame capacity in the down link.