MIX Modem - GSM
User Manual V.1.1
Pag. 8
Subject to change without prior notice
1.5.2 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.
1.5.3 Voice Calls
The wireless modem offers the capability of MO (mobile originated) and MT (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 wireless modem offers balanced analogue input and output lines. The
wireless modems support HR, FR, EFR and AMR vocoders.
1.5.4 Data
The wireless modem supports the following data protocols:
• GPRS (General Packet Radio Service)
The wireless modem is a Class B terminal. The wireless modem is GPRS multi-slot class10 (4+2)
enabled, capable of receiving at a maximum of four timeslots per frame (down link), and
transmitting in two timeslots per frame (up link). See section 1.4.5
for multi-slot allocation by class.
• CSD (Circuit Switched Data)
The MTX-63I/65I wireless modem is capable of establishing a CSD communication at 9.6 kbps and
14,4 kbps over the air.
Feature
GSM850
E-GSM900
GSM1800
GSM1900
Frequency
range (MHz)
Tx
824-849
880-915
1710-1785
1850-1910
Rx
869-894
925-960
1805-1880
1930-1990
RF power @ARP with
50Ω load (typ)
33dBm
33dBm
30dBm
30dBm
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 12
