2. GT47/GT48 CONTROL TERMINALS
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2.4.2 Short Message Service
The Control Terminal 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). 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
Control Terminal supports up to 6 concatenated messages to extend this
function.
2.4.3 Voice Services
The Control Terminal offers the capability of mobile originated and mobile
terminated voice calls, as well as supporting emergency calls. Multi-party,
call waiting and call divert features are available. Some of these features are
network-operator specific.
For the inter-connection of audio, the Control Terminal offers a balanced
4-wire analogue interface.
DTMF (Dual Tone Multi Frequency) is supported.
GT48
GSM850
GSM1900
Frequency Range (MHz)
TX: 824-849
RX: 869-894
TX: 1850-1910
RX: 1930-1990
Channel spacing
200kHz
200kHz
Number of channels
124 carriers *8 time slots
299 carriers *8 time slots
Modulation
GMSK
GMSK
TX Phase Accuracy
< 5º RMS phase error (burst)
< 5º RMS phase error (burst)
Duplex spacing
45MHz
80MHz
Receiver sensitivity at
antenna connector
< –102dBm
< –102dBm
Transmitter output power
at antenna connector
Class 4
2W (33dBm)
Class 1
1W (30dBm)
Automatic hand-over between GSM850 and GSM1900