Motorola R-2002A Manual page 221

3.0 TESTING CELLULAR RADIOS
To ensure satisfactory operation of the cellular radio
the proper operation of the digital and analog signal:
ing functions, the transceiver function the trans-
ceiver control function, and the
infor~ation
con-
tained in the Number Assignment Module (NAM)
must be verified. Since the transceiver is generally
only controllable through an on-board controller the
first item to be checked must be that controller.' For
AMPS compatible radios and for most radios in
general, a basic self check of the controller system is
performed when the radio is first turned on. If the
self test is successfully completed the handset in-
dica.tor~
are
acti~ate?.
If the controller is not working
the mdtcators wtll either not activate or will activate
in an
ab~ormal
manner. Generally, a failed con-
troller wtll prevent further testing and trouble-
shooting until it is either replaced or repaired.
Once past the self test, the cellular radio will then at-
tempt. to
l~cate
a forward control channel (FOCC),
At thts pomt the R2008D/R2010D can be used to
su!'ply the FOCC signal modulated with the appro-
pnate forward control messages. A cradle 'no service'
indicator will extinguish when the radio has suc-
cessfully tuned to, decoded, and responded to the
FOCC signal.
A failure at this portion of the sequence would most
likely indicate that the receiver or the receiver/con-
troller interface circuitry has failed:
The manual test mode of the R2008D/R2010D which
allows separate control and monitoring of the re-
ceiver, transmitter, and controller status can be used
to isolate the source of the failure.
With the cellular radio in service either the call
origination or the call reception capability of the
radio can be checked. With the R2008D/R20IOD the
signaling exchange necessary to execute both se-
quences can be generated with the proper responses
automat~cally.
checked for accuracy. Error messages
are provtded m the event that the radio does not re-
spond properly. These messages and the manual test
capability can then be used to isolate the cause of the
failure.
Failure at this point would most likely be in the trans-
Il_litte_r or data generating circuitry as the receiving
cucuttry had to be working to get an 'in service' in·
dication.
. .
4
A successful call origination or call reception test will
end with the radio on a voice channel. On the voice
channel the radio detects and checks for the correct
SAT frequency, and then transponds the SAT signal
on the reverse voice channel. It is necessary to verify
that the radio correctly identifies the SAT frequency
and that it correctly transponds the signal. The
R2008D/R20lOD again handles this verification
automatically with error messages being provided in
the event of
11
failure.
Other functidns to be checked on the voice channel
are transmitter power output and control, transmit
frequency error:, and modulation limiting. Each of
these functions is easily checked with the R2008D/
R20lOD with the data readouts provided on the cellu-
lar control display. Power, frequency error and
modulation checks on other channels is implem'ented
with the use of the channel handoff capability. From
the cellular control display, the signaling necessary to
cause the radio to move
to
any cellular channel can
be initiated. For the handoff, the R2008D/R2010D
verifies the response from the radio, and once on the
new. channel, verifies the correct SAT response.
Agam, error messages are generated in the event of a
failure and with the manual test mode can be used to
isolate the cause of the failure.
Finally, the R2008D/R2010D can verify the termina·
~ion
sequence again with appropriate error messages
m the event of a failure. User unique information
such as home system identification number, tele-
phone number, and control head lock code can be
read from the NAM using the manual mode. This in-
formation will be required when servicing any cellu-
lar radio.
4.0 THE R2008D/R2010D TEST CAPABILITIES
Cellular testing capability has been made possible in
the R2008D/R2010D by the addition of one new
module over the R2001D system analyzer (see note).
A new cellular option board is added that performs
the RF and manual interfacing to the cellular tele-
phone transceiver unit.
It
controls the modulation of
di~ital messages, audio and SAT tones by using the
microprocessor to command the cellular radio.
The cellular option board also decodes the digital
messages returned by the cellular telephone. This in-
cludes synchronizing on the dotting sequence and the
word sync sequences at the start of these messages
and decoding the Manchester encoded data in the
message stream. The recovered digital information is
then sent to the microprocessor board for processing.
The cellular board also detects the presence of the lO
KHz ton_e sent by the cellular telephone, and can
measure 1ts duration.
It
does the necessary routing of
SAT tones and audio.