Agilent Technologies 8960 10 Series Reference Manual page 506

Block Diagram
Digital Signal Processing Module
The Digital Signal Processing (DSP) module is responsible for a variety of tasks within the overall test set
architecture. These tasks are:
• demodulating data from the radio under test (data received from the Demodulation Downconverter module) and sending
the demodulated data bits to the Protocol Processor module
• for some systems, perform audio measurements using audio information sent to the DSP module from the Protocol
Processor module
• execute a variety of signal processing algorithms to perform measurements on the radio system of the currently loaded
TA (data received from the power detector ADC, the measurement ADC and, in some cases, data received from the
Demodulation Downconverter ADC)
The DSP processor communicates with the Host Processor and the Protocol Processor, as well as controlling
the configuration and synchronization of the Analog To Digital Converter module.
Protocol Processor Module
The Protocol Processor module is responsible for maintaining the radio link between the test set and the
mobile station under test. The primary tasks of the Protocol Processor module are:
• generating the protocol messaging necessary for the forward channel and sending that protocol stream to the test set's RF
source for transmission to the mobile station
• decoding the protocol messaging received from the mobile station under test on the reverse channel
• computing measurement results which are associated with data bits contained within the mobile stations messaging, such
as bit error ratio
Host Processor Module
The Host Processor module is responsible for a variety of tasks within the overall test set architecture. These
tasks include:
• control of the manual user interface (MUI)
• executing commands and processing data received from the LAN interface
• executing commands and processing data received from the GPIB interface
• controlling disk access
• control of all RF and audio hardware modules
• routing measurement results received form the Digital Signal Processing and Protocol Processor modules to the
appropriate output device (display, GPIB, LAN, serial, etc.)
Voltmeter/Counter
Voltmeter The voltmeter is primarily used to measure external DC & AC voltages. A secondary purpose is to
measure internal voltages for instrument self-diagnostics.
The external voltmeter is capable of measuring DC voltages up to + 50 VDC and AC voltages up to 50 Vpk. A
true RMS detector is used for measuring AC voltages. For internal measurements, a switch routes the
diagnostic MUX output to the Voltmeter 1 path.
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