Ericsson M3090, Руководство интегратора

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8 M3090 Integrator’s Manual
Doc.no: 198 17 - KRD 102 303 Uen, Rev B
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A fixed terminal is connected to the network by landline facilities.
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A mobile terminal communicates with radio base stations via a radio modem.
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Radio base stations direct data to and from the fixed and mobile terminals in
their coverage area. If a radio base station receives data addressed to a mobile
or a fixed terminal outside its coverage area, the radio base station transfers the
data to the exchange to which it is connected. The exchange, in turn, transfers
the data to the radio base station that is in contact with the addressed terminal.
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Throughout the Mobitex network, data is transmitted and received in the form
of data packets, called MPAKs. Each MPAK includes addressee, sender and
user data (text and binary data), as well as certain control data.
An MPAK can contain a maximum of 512 bytes of user data.