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Service 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
Figure 10. Cellular Telephone Call Processing Termination
Cellular Telephone
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 cellular telephone rescans
the access / paging channels
for the strongest signal and
decodes data. The cellular
telephone responds to
requests for data.
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.
Switch / Cell Site
VOICE + (D)SAT
FOVC & REVC
(D)ST +
(D)SAT
The cell site receives the
signaling tone (DST) and
REVC
notifies the switch of the
disconnect. The cell site
mutes the audio path on the
voice channel.
12
The switch informs the TelCo
of the disconnect and the
landline is released.
DATA
Overhead data sent out on
FOCC
the control channel.
&
RECC
©2000 Motorola, Inc.
Cellular Overview
Analog Cellular
Landline Network
Conversation in progress.
The landline is released.
15
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