2.3 Features

The wireless modem performs a set of telecom services (TS) according to 3GPP release 99 and ITU-T. The functions of the wireless modem are implemented by issuing AT commands over a serial interface.

2.3.1 Types of Mobile Station

The GR64 is a fully Quad Band capable GSM/GPRS mobile station with the characteristics shown in the table below.

Feature

Frequency range (MHz)

Channel spacing

Number of channels

Number of TD slots

Duplex spacing

GSM power class

Modulation

Receive sensitivity

GPRS multi-slot class

Tx

Rx

GSM850

 

E-GSM900

 

GSM1800

 

GSM1900

 

824-849

 

880-915

 

1710-1785 1850-1910

 

 

 

 

 

 

 

 

 

869-894

 

925-960

 

1805-1880 1930-1990

 

200kHz

 

200kHz

 

200kHz

 

200kHz

 

124

 

174

 

374

 

299

 

8

8

8

8

 

45MHz

 

45MHz

 

95MHz

 

80MHz

 

4 (2W)

 

4 (2W)

 

1 (1W)

 

1 (1W)

 

 

 

 

 

GMSK

 

 

 

<-102dBm at antenna connector

Class 10

2.3.2 Short Message Service

The wireless modem supports the following SMS services:

•Sending; MO (mobile-originated) with both PDU (protocol data unit) and text mode supported

•Receiving; MT (mobile-terminated) with both PDU and text mode supported

•CBM (cell broadcast message); a service in which a message is sent to all subscribers located in one or more specific cells in the GSM network (for example, traffic reports)

•SMS status report according to 3GPP TS 23.40

The maximum length of a text mode SMS message is 160 characters using 7-bit encoding. The wireless modem supports up to six concatenated messages to extend this function. Concatenation is performed by the host application.

LZT 123 1834

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