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S:\agilent\8920\8920b\PRGGUIDE\BOOK\CHAPTERS\callproc.fb
Chapter 8, Programming the Call Processing Subsystem
Description of the Call Processing Subsystem’s Remote User Interface
Description of the Call Processing Subsystem’s Remote User Interface
The Call Processing Subsystem’s Remote User Interface consists of the following
items:
• a set of programming commands which access all available fields on the five Call
Processing Subsystem screens
• a status register group whose condition register reflects the current state of the Call
Processing Subsystem annunciator state indicators
• a set of error messages, available through HP-IB, which provide information about
error conditions encountered while in the Call Processing Subsystem
The programming commands provide the capability to generate control programs which
can establish a cellular link between the Test Set and a cellular phone (mobile station). The
status register group and the error messages provide the control program with the
information necessary to make program flow decisions.
Once a link is established the control program can exercise the call processing
functionality of the mobile station, such as:
• the decoding of orders from the Base Station, such as; orders to retune the transceiver
to a new frequency, to alert the mobile station user to an incoming call, to adjust the
transceiver output power level, or to release the mobile station upon completion of a
call.
• the encoding of signaling information for transmission to the base station, such as;
dialed digits for call origination, disconnect signal at the completion of a call, or mobile
identification number.
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.