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SWT 3000 Equipment Manual PU3 Module

Functions of the PU3f module

The PU3f (Processing Unit) is the central control module of the SWT 3000 unit. At the transmit

end it converts protection commands that are received via an interface module IFC-D or IFC-P into

tones of a defined frequency. If the PU3 is housed in a remote (stand-alone) SWT 3000 unit these

are transmitted either via a copper line equipment module CLE on a cable link to the distant station

or to the interface module of a PLC unit. From there they are further transmitted via a high-voltage

line to the distant station.

It is also possible to connect the serial synchronous interface (SSI) of the PU3f module via a fibre

optic module (FOM) digital to the PowerLink PLC system or to an other SWT 3000 system.

LIA

DLE

IFC-1

PU3f

ALRS

LID-1

LID-2

CLE

IFC-2

SV-1

SV-2

SWT3000

X.21/G703.1/G703.6

FOM

SSI

PU3f Processor unit CLE Copper line equipment

IFC Interface module ALRS Alarm relay module

SV Power supply LIA Line interface analog

DLE Interface module to digital LID Line interface digital

transmission paths VF Voice frequency

FOM Fibre optic modem SSI Serial synchronous interface

Figure 1: Block diagram of the SWT 3000 unit

The PU3 module can be expanded optionally by a submodule DLE for digital transmission paths

accommodating two digital line interfaces LID-1 and LID-2. These are used for transmitting the pro-

tection commands over a digital network (SDH/PDH). The LID can be connected also via a FOM

module and a FOBox to a multiplexer system.

Siemens SWT-3000 User Manual

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