Function Description
Overview
The Copper Line Equipment module (CLE) provides the interface between an SWT 3000 unit (operated as a
stand-alone unit) and a copper transmission line for analog transmission. The teleprotection signal is trans-
mitted in the VF range from 300 Hz to 4000 Hz.
The following equipment configurations are possible:
•
Connection of 2 SWT 3000 stand-alone units each containing one CLE module.
•
Connection of an SWT 3000 stand-alone unit to a PowerLink unit. The SWT 3000 unit contains a CLE
module as interface and the PowerLink unit a VFx card. The S6 control wire for modules CLE and VFx
makes alternate multi-purpose operation possible.
The CLE module contains 2 independent circuit sections:
•
A transmit amplifier
•
A receive filter
The CLE is connected to the PU4 module in the SWT 3000 unit. The PU4 generates the VF signal which must
be transmitted. The VF signal is fed onto the transmission line by the transmit amplifier of the CLE. In the
opposite direction, the VF signal is forwarded from the transmission route to the PU4 via the receive filter.
The CLE does not have any control elements but 3 alarm displays and 2 test sockets on the front panel. The
CLE module does not generate any alarms but displays alarms generated by the PU4.
[dwblccle-220513-01.tif, 1, en_US]
Figure 10-1
Block Diagram of the CLE Module
TXALR
Transmitter alarm
RXALR
Receiver alarm
S/N
S/N alarm
Prot.
Protection circuit
10.1
10.1.1
Copper Line Equipment Module
10.1 Function Description
340
Smart Communication, SWT 3000 Teleprotection, Equipment Manual
C53000-G6040-C605-1, Edition 03.2020
