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Chapter 6, Call Processing Subsystem
The CALL CONTROL Screen
NOTE: When the CALL CONTROL screen is displayed and the Call Processing Subsystem is in
the connected state (Connect annunciator is lit), the Test Set constantly monitors the
mobile station’s transmitted carrier power. If the power falls below 0.0005 Watts the Test
Set will terminate the call and return to the active state (Active annunciator is lit). The
mobile station’s transmitted carrier power is monitored on all Call Processing Subsystem
screens except the ANALOG MEAS screen.
If the Test Set is in the connected state (Connect annunciator is lit) and a
change is made to the Cntl Channel field the connected state will be lost.
Display
This field is used to select the type of mobile station information to be displayed
in the upper right-hand portion of the CALL CONTROL screen:
• Select Data to display information received from the mobile station on the reverse
control channel or reverse voice channel. If the data message(s) received from the
mobile station can be correctly decoded, the decoded message contents are displayed.
If the data messages cannot be correctly decoded, the raw data message bits are
displayed in hexadecimal format. Figure 16 on page 122 shows the layout of the CALL
CONTROL screen when a decoding error has occurred.
The decoded order confirmation message, origination message, and order message are
available from the reverse control channel. The following pieces of information are dis-
played when these messages are properly decoded: phone number, ESN (dec), ESN (hex),
the decoded Station Class Mark (SCM), and the called number. The decoded SCM con-
sists of: the mobile station power class (Class I, II, or III), the transmission type (continu-
ous/discontinuous), and the transmission bandwidth (20 MHz or 25 MHz).
• The decoded Order Confirmation Message is available from the reverse voice chan-
nel.
• Select Meas to display modulation quality measurements made on the mobile station’s
RF carrier while on a voice channel.
For system types AMPS, TACS, and JTACS four characteristics of the RF carrier are
measured: TX Freq Error, TX Power, FM Deviation, and AF Frequency. When set to the
Meas display, the AF Analyzer’s settings are 300 Hz HPF, 15 kHz LPF, De-Emphasis
Off, PK+ detector. The Meas information is available only when the Test Set’s Connect
annunciator is lit (connect state). Refer to the individual field descriptions for further
information. Figure 17 on page 122 shows the layout of the CALL CONTROL screen
when Meas is selected.
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