Direct Connection Via Optical Fibre Connection; Mode Of Operation: Analog - Siemens SWT-3000 Equipment Manual

Functional Description

Direct connection via optical fibre connection

SWT 3000
Slot PU3f
PU3f
DLE
Figure 4:
Two SWT 3000 are direct connected via optical fibre. The transmission is carried out with 2Mbit/s.
Fibre optic module:
Fibre type:
Wave length:
Opt. connector:
Range
LED:
2 x LED:
Clock:

Mode of operation: analog

F6 Modulation:
Security:
Coded tripping (CT):
Page - 10
Slot FOx
FOM
E
RS422
O
Optical fibre connection SWT 3000 – SWT 3000
SFP-Module
Single mode
1300 nm or 1500 nm
LC-connector
depending on SFP module and bit rate
Receiver alarm
TX- and RX-Alarm (RX + F6UE-Alarm)
DTE or DCE adjustable
The principle of F6 modulation (frequency-shift keying FSK) is applied
with the SWT 3000. Therefore only one of the possible frequencies is
ever transmitted. This enables the available transmit power to be used to
the full.
The influence of burst interferences with amplitudes that can be signifi-
cantly greater than the wanted signal is suppressed. This is achieved by
limiting the amplitude of the input signal with the largest possible band-
width and then analyzing the frequency with a small bandwidth. Burst in-
terferences are generated, for example, by lightning strike or by switching
operations in high-voltage systems.
An optimum setting of the evaluation thresholds and the integration times
guarantees maximum security against unwanted tripping and a high de-
gree of reliability at the same time. Protection commands are still trans-
mitted in time despite serious interference.
The CT function is available for the analog line interface (LIA). The com-
mand codes consist of two simultaneously transmitted trip frequencies
(parallel coding).
Edition p3_3_2x 08/09
SWT 3000 Equipment Manual
SWT 3000
Slot FOx
FOM
<80km
E
O
Slot PU3f
PU3f
RS422
DLE
© SIEMENS AG 2008