2. GT47/GT48 CONTROL TERMINALS
8
LZ T 123 7 605 P1C
• 2 x RS232 interfaces with a useful range of configurable IOs
• TCP/IP stack
• Data: GPRS, HSCSD, CSD, SMS
• Voice: full rate, enhanced full rate, half rate; AMR (GT48)
• SMS: mobile-originated, mobile-terminated, cell broadcast
• Fax: Group 3, Classes 1 & 2
• 15 way high density connector
• 5V to 32V d.c. input
• 4-wire audio connection
• Antenna connection (FME male)
• R&TTE type approved (GT47)
2.3 Control Terminals in a Communication System
Figures 2.1 and 2.2 illustrate the main blocks of a wireless communication
system using the Control Terminal. Figure 2.1 shows the communication
system when the script is embedded on the Control Terminal and figure
2.2 shows the communication system when a micro-controller is used.
They also show the communication principles of the system and the
interface between the Control Terminal and the application. The
definitions in the figures, as used elsewhere in this manual, are in
accordance with the recommendations of GSM 07.07.
• The MS (mobile station) represents the Control Terminal and SIM card.
The Control Terminal excluding SIM card, is known as the ME (mobile
equipment).
• The DTE (data terminal equipment) is the controlling application. This
can be either an external host or an internal embedded application.
• The DCE (data circuit terminating equipment) is the serial
communication interface of the MS.