HP 8920A Programmer's Manual page 447

Chapter 8, Programming The Call Processing Subsystem
Description of the Call Processing Subsystem's Remote User Interface
In addition to the mobile station's call processing functions, the control program can
utilize the RF and audio instruments in the Test Set to characterize the overall
performance of the mobile station while on an active voice channel by making such
measurements as; receiver sensitivity, FM Hum & Noise, transmitter carrier power, carrier
frequency accuracy, or SAT tone deviation.
The Call Processing Subsystem decodes various reverse control channel and reverse voice
channel signaling messages. The remote user interface provides commands which allow
the control program access to the contents of the decoded messages.
For forward control channel and forward voice channel signaling messages, the Call
Processing Subsystem provides the option of sending messages whose contents are built
using the rules and regulations specified in the applicable industry standard, or the control
program can define the message contents as desired. Having the capability to set the bit
patterns of the signaling messages sent to the mobile station gives the control program the
capability to test the robustness of the mobile station by introducing known errors into the
signaling messages. Once an error has been introduced the control program can monitor
the response of the mobile station.
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