User Manual

GM47/48 Technical description

BA/SEM/MS 02:0004 Rev B

Automatic hand-over between GSM 850 and GSM 1900

1.2.2 SMS

The module supports the following SMS services:

• Sending: MO, both PDU and Text mode supported.

• Receiving: MT, both PDU and Text mode supported.

• CBM is a service, in which a message is sent to all subscribers

located in one or more specific cell(s) in the GSM network, for

example, cell location information.

• 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 bytes.

The module does support upto 6 concatenated messages to extend this

function.

1.2.3 Voice calls

The GM47/48 offers the capability of MO and MT voice calls, as well

as supporting emergency calls. In addition to this multiparty, call

waiting and call deflection features are available. Some of these

features are operator specific.

The module offers normal analogue input/output lines, analogue audio

input/ output lines in differential modes, and digital audio interface,

with the possibility of accessing internal points within the digital

audio lines. Moreover, the GM 47/GM48 has embedded echo

canceller and noise suppresser, which provides high quality audio.

The module supports both HR, FR and EFR voice coding, provided

that EFR is available in the network.

1.2.4 Data

The module supports the following data protocols:

• General Packet Radio Service (GPRS). The modules are Class B

Terminals, which provides simultaneous activation and attach of

GPRS and GSM services. The GM47/48 modules are GPRS 3+1

devices, which are capable of transmitting in one timeslot per

frame (uplink), and receiving in a maximum of three timeslots per

frame (downlink).

• Circuit Switched Data (CSD). GM47/48 modules are capable to

stablish a circuit switch data communication at 9.6 kbps, V42bis

compression is not supported.