Transceiver And Processing Unit - Klein 3900 Series Operation And Maintenance Manual

1.4.3

Transceiver and Processing Unit

The TPU provides signal processing along with the system control and data
telemetry functions. The TPU is composed of two circuit boards: an embedded
CPU board and a Demultiplexer board. The TPU also contains a 200-volt towfish
power supply and a TPU power supply. A block diagram of the TPU is shown in
Figure 1-5.
Main Input
On/Off
Fuse
120/240
Switch
(switchable)
Host Computer Card
IRIG Card (Option)
VME
BUS
Demultiplexer and
DSP Processing Card
CPU board. The CPU board is an embedded MVME-5100-based processor
board that enables external control of the TPU by a PC connected via an
Ethernet 100BaseT local area network (LAN), providing control over system
functions. All functions, including communicating the operating parameters to
the DSP and extracting sensor data from the Demultiplexer board, are
communicated over the LAN.
Demultiplexer board.
data telemetered from the towfish, recovers the clock and data, and then
decodes the data and routes it to the DSP for processing. The Demultiplexer
board also contains an FSK modulator for transmitting trigger signals and
towfish commands to the towfish. This modulator is under control of the CPU
board.
Theory of Operation
200 VDC
Towfish Fuse
Power Supply
TPU
Power Supply
Figure 1-5: TPU Block Diagram
The Demultiplexer board receives the encoded digital
Power
Splitter
Data and 200VDC
100 Base Tx LAN
COM1 Serial Port (System Setup)
Data
Trigger Out 1 (Side Scan)
COM2 Serial Port (NEMA Nav In)
COM3
COM4
1-9
Tow Cable