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Chapter 6, Call Processing Subsystem
The CALL CONTROL Screen
System Type
This field is used to select the type of cellular system (AMPS, TACS, JTACS)
which will be simulated.
The
System Type field is an immediate action field. That is, whenever the
System Type field is changed, the change is reflected immediately in the
physical configuration of the Test Set. The control channel is immediately de-
activated, reconfigured, and then re-activated to reflect the change. This change
causes the Test Set to enter the active state).
NOTE: If the Test Set is in the connected state (Connect annunciator is lit) and a change is made to
the System Type field, the connected state will be lost.
TX Freq Error
This field displays the frequency error (frequency error = assigned carrier
frequency - measured carrier frequency) of the RF carrier being transmitted by the
mobile station. Four dashes (----) indicate that no RF carrier is present to measure.
A numeric value would only be displayed in the connected state (that is, the
Connect annunciator is lit). The TX Freq Error field is displayed only when
the Display field is set to Meas.
TX Power
The TX Power field is displayed only when the Display field is set to Meas.
This field displays the measured RF power of the RF carrier being transmitted by
the mobile station. A non-zero value would only be displayed when the Test Set’s
Connect annunciator is lit).
When the CALL CONTROL screen is displayed and the Test Set is in the
connected state (
Connect annunciator is lit), the mobile station’s transmitted
carrier power is constantly monitored. If the power falls below 0.0005 Watts, the
error message
RF Power Loss indicates loss of Voice Channel will
be displayed, and the Test Set will terminate the call and return to the active state
(Active annunciator is lit).
• In order to ensure that the Test Set makes the correct decisions regarding the presence
of the mobile stations’s RF carrier, the Test Set’s RF power meter should be zeroed
before using the Call Processing Subsystem. Failure to zero the power meter can result
in erroneous RF power measurements. See "Conditioning the Test Set for Call
Processing" on page 130 for information on manually zeroing the RF Power meter.
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