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Cellular Overview
Figure 8. Land to Cellular Telephone Call Processing
Landline Network
The landline caller dials the
cellular telephone number.
The Public Service Telephone
Network (central office)
forwards the call to the central
controller (switch).
The landline caller hears
ringing, busy, etc.
Conversation in progress
12
Switch / Cell Site
Overhead data is sent out
on the control channels.
The switch receives a call from
land. The switch pages the
cellular telephone. The page is
sent as data on the forward
control channel.
The cell site receives the
acknowledgement and sends it
to the switch. The switch
verifies the ESN & MIN and
assigns a voice channel.
The cell site informs the
cellular telephone of the voice
channel and SAT (DSAT).
The cell site sends the SAT
(DSAT) on the voice channel.
The cell site receives the correct
SAT (DSAT) and alerts the
cellular telephone to ring.
The cell site receives signaling
tone (DST message) from the
cellular telephone.
The cell site unmutes the
voice path.
VOICE + (D)SAT
FOVC & REVC
©2000 Motorola, Inc.
TDMA T2290/T2297
Cellular Telephone
DATA
The cellular telephone is
FOCC
tuned to the
&
access / paging
RECC
channel, and responds
to requests for data.
DATA
The cellular Telephone
FOCC
decodes the data and
successfully reads its MIN.
The telephone scans the
control channels for the
strongest, then acknow-
ledges the page by sending
DATA
it' s ESN, MIN, and NAMPS
RECC
or digital capability as data
on the control channel.
DATA
FOCC
The telephone receives
the data and tunes to the
(D)SAT
assigned voice channel,
FOVC
then transponds
the SAT (DSAT).
(D)SAT
REVC
DATA
The cellular telephone
FOVC
rings. While ringing, the
subscriber unit sends a 10
(D)ST +
kHz signaling tone (DST
(D)SAT
message) to the cell site.
REVC
The cellular telephone user
answers by pressing SND
(D)SAT
REVC
The signaling tone stops.
Conversation in progress
Voice path unmuted
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