Motorola M3097 Service Manual download pdf (Page 26)

Cellular OverviewService Manual

Call Termination

When the call is terminated by the landline

caller (not the cellular telephone user), the

central controller (switch) issues a release

order to the subscriber unit. The cellular

telephone acknowledges with a 10kHz sig-

nalling tone burst for 1.8 seconds and the

cellular telephone ceases transmission.

If the call was terminated by the cellular tele-

phone user, the telephone generates a 10kHz

Cellular Telephone

Landline Network

(D)ST +

(D)SAT

Switch / Cell Site

VOICE + (D)SAT

Overhead data sent out on

the control channel.

DATA

The cellular telephone rescans

the access / paging channels

for the strongest signal and

decodes data. The cellular

telephone responds to

requests for data.

Conversation in progress.

Voice path is unmuted.

The cellular telephone user

hangs up or hits the END key to

terminate the call.

The cellular telephone sends a

1.8 second burst of 10 kHz

signaling tone or a DST vector

to the cell site, then stops

sending SAT (DST).

The cell site receives the

signaling tone (DST) and

notifies the switch of the

disconnect. The cell site

mutes the audio path on the

voice channel.

The switch informs the TelCo

of the disconnect and the

landline is released.

The landline is released.

FOVC & REVC

REVC

FOCC

RECC

signalling tone burst for 1.8 seconds, indicat-

ing a call termination request to the switch.

In either case after call termination, the cel-

lular telephone goes back to rescan the na-

tionwide set of forward controlchannels and

repeats the Going into Service process it per-

formed at first turn-on to re-establish itself

on a paging channel.

Figure 10. Cellular Telephone Call Processing Termination

Analog Cellular

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Motorola M3097 Service Manual Page 26

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