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Cellular Overview
Analog Cellular
Total deviation of two or more signals is cu-
mulative.
Going into Service
When first turned on, the cellular telephone
will scan through the nationwide set of for-
ward control channels (FOCC' s) and measure
the signal strength on each one. It will then
tune to the strongest one and attempt to de-
code the overhead control message. From the
overhead message, the telephone will be able
to determine whether or not it is in its home
system, and the range of channels to scan for
paging and access. Telephones not in their
home system will be able to use other cellu-
lar telephone systems depending on the level
of service requested by the user. If paging
channels are used, the telephone next scans
each paging channel in the specified range
and tunes to the strongest one. On that chan-
nel the telephone continuously receives the
overhead message information plus paging
messages. At this point the telephone idles,
continuously updating the overhead message
information in its memory and monitoring
the paging messages for its telephone num-
ber.
Step 1.
The telephone powers up and runs
a self-test. The NoSvc indicator is
illuminated.
Step 2.
The telephone scans its preferred
system (A or B) as selected in pro-
gramming.
Step 3.
The telephone scans all twenty-one
control channels.
Step 4.
The telephone tunes to the stron-
gest control channel.
8
Step 5.
Step 6.
Step 7.
Step 8.
Step 9.
Step 10. The telephone turns off the NoSvc
Step 11. The telephone idles. Typically a re-
Step 12. The telephone turns on (or leaves
Step 13. The telephone switches to the non-
*The area between Decision point 5 and De-
cision point 8 can be quite active.
In a few larger systems, following the suc-
© 2000 Motorola, Inc.
TDMA Timeport™ P8190
Decision point. Can the overhead
message from the strongest control
channel be decoded? If not, go to
step 6. If it can be decoded go to
step 8.*
The telephone tunes to the second
strongest channel.
Decision point. Can the overhead
message stream be decoded? If not,
go to step 12. If it can be decoded,
go to step 8.*
Decision point. Does the decoded
System ID match the Home Sys-
tem ID programmed in the tele-
phone? If not, go to step 9. If it
does match, go to step 10.
The telephone turns on the ROAM
indicator.
indicator.
scan occurs after 5 minutes.
on) its NoSvc indicator.
preferred system as recorded in
programming, and goes back to
step 3. The ability to return to step
3 can be disabled by some settings
of System Registration.
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