HP 8920A, User Manual

Page: 123 / 658

123
Chapter 6, Call Processing Subsystem
The CALL CONTROL Screen
The CALL CONTROL screen is the primary Call Processing Subsystem screen. It
contains the most often used call processing configuration and command fields.
Figure 18 on page 122
shows the CALL CONTROL screen for NAMPS.
The top right-hand portion of the CALL CONTROL screen is used to display the
following information:
• decoded data messages received from the mobile station on the reverse control channel
or the reverse voice channel
• modulation quality measurements made on the mobile station’s RF carrier while on a
voice channel
• raw data message bits, displayed in hexadecimal format, received from the mobile
station on the reverse control channel or reverse voice channel when a decoding error
occurs
The type of information to be displayed is selected using the
Display
field. Refer
to the
Display field description, on page 127
for further information.
[] Access
When lit, the
Access
annunciator indicates the Test Set is signaling the mobile
station with command information on the forward voice channel. This is a
transitory state.
The Test Set’s speaker is turned off when in the access state. This is done to
eliminate any possible audio feedback which may occur if the mobile station’s
microphone is open.
Active
This field is used to turn on the forward control channel of the Test Set or to force
a return to the active state from any other state (register, page, access, connect). If
the forward control channel of the Test Set is already active, selecting this field
will deactivate and then reactivate the control channel.
[] Active
When lit, the
Active
annunciator indicates the control channel of the Test Set is
turned on.
If this annunciator is lit, the base station is transmitting system parameter
overhead messages on the assigned control channel. If the annunciator is not lit,
the base station is not active.