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Block Diagram Theory of Operation
Block Diagram 4
Block Diagram 4
This block diagram illustrates the assemblies that are unique to the HP/Agilent 8922E/F/
G/H. These modules are primarily digital and represent the hardware necessary to create
the digital protocol to set up and maintain a phone call with a GSM mobile phone. A
special diagnostics “loopback” program is included on the diagnostic memory card. This
program causes the HP/Agilent 8922E/F/G/H to set up a phone call to itself (loopback),
and measure the bit error rate. This exercises most of the digital hardware and gives a high
confidence that the A31 CODEC, A32 GSM Controller, and A34 GSM RTI assemblies are
operating correctly.
A31 CODEC
A32 GSM Controller
A34 GSM RTI
The A31 CODEC assembly provides the speech processing (coding and decoding) to
convert the analog speech to and from the GSM format. This assembly also provides many
of the real time channel processing functions that keeps the HP/Agilent 8922G
synchronized with the mobile radio.
Overall control of the A31 CODEC, A32 GSM Controller, and A34 GSM RTI assemblies
is provided by the A32 GSM Controller assembly. This A32 assembly interfaces with the
main controller (A7) for communication with the remainder of the instrument. The A32
GSM Controller assembly also communicates with the Option 003 A35 Protocol Interface
assembly.
The A34 GSM RTI (Real Time Interface) assembly provides the logic and switches to
interface the data, clock and synchronization signals into the analog RF generator and RF
analyzer hardware. This assembly replaces a jumper board (A34 in the HP/Agilent 8922A
instrument) which allows it to access external signals from the front and rear panel, as well
as provide key signals to the A33 Hop Controller assembly and A5 Premod Filter/NSM
assembly.
A35 Protocol Interface (HP/Agilent 8922F/HM/S Option 003 Only)
This assembly buffers the digital signal from the A32 GSM Controller assembly to the
rear panel where it can be connected to a protocol analyzer. This option allows a user to
view the messages that are passed over the communication channel between the radio and
the HP/Agilent 8922F/H.