Modem User Manual

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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 GSM850 E-GSM900 GSM1800 GSM1900
Tx 824-849 880-915 1710-1785 1850-1910
Frequency range (MHz)
Rx 869-894 925-960 1805-1880 1930-1990
Channel spacing 200kHz 200kHz 200kHz 200kHz
Number of channels 124 174 374 299
Number of TD slots 8 8 8 8
Duplex spacing 45MHz 45MHz 95MHz 80MHz
GSM power class 4 (2W) 4 (2W) 1 (1W) 1 (1W)
Modulation GMSK
Receive sensitivity <-102dBm at antenna connector
GPRS multi-slot class 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.