Siemens SWT-3000 Equipment Manual page 182

SWT 3000 Equipment Manual
When the unit is started a self-test is carried out. A watchdog also monitors the functionability of
the internal digital signal processor (DSP). In the event of malfunctions the transmitter output and
the relay outputs of the unit are blocked. An overview of the functional units of the PU3f is shown in
the following diagram.
PU3f
optional
PU3f Processor and analysis module
IFC-x Interface module
iSV Internal power supply
DLE Interface module to digital
transmission paths
Figure 3:
© SIEMENS AG 2008
LIA
PU3
ISV
DSP
Controller
DLE
Functional units of the PU3 module
Edition p3_3_x 08/09
SSI
D
VF
A
X.21/G703.1/G703.6
LID-1
X.21/G703.1/G703.6
LID-2
CSP Central signal processing
FOM Fibre optic modem
CLE Copper line equipment
LID-x Line interface digital
DSP Digital signal processor
PU3 Module
CSP
FOM
CLE
IFC-D/P
ALRS
CSP
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