Ericsson M3090, Руководство интегратора

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10 M3090 Integrator’s Manual
Doc.no: 198 17 - KRD 102 303 Uen, Rev B
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The transmitter is turned on when the radio modem:
• is about to become active in the network
• transmits data, i.e. MPAKs, to the radio base station
• acknowledges received MPAKs
• changes radio base stations; it then has to inform the network of the change,
this is called Roaming
• changes its operation mode, from power saving mode to express mode or
vice versa
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Besides receiving MPAKs addressed to the host, the radio modem frequently
receives control signals from the network. These control signals are used to
select the radio base station with the strongest radio signal.
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Using the Mobitex Asynchronous Communication Protocol (MASC), the micro
controller handles communication between the host and the Mobitex network.
The controller consists of a CPU, internal software which handles the MASC
protocol, and a radio protocol for communication with the network. For further
information about the MASC protocol, see the MASC Programmers Manual.
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The modem software is stored on a flash memory chip while an EEPROM is
used for configuration data.