Functional Description SWT 3000 Equipment Manual
Page - 10 Edition p3_3_2x 08/09 © SIEMENS AG 2008
Direct connection via optical fibre connection
E
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PU3f
FOM
Slot PU3f Slot FOx
SWT 3000
<80km
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RS422
DLE
PU3f
FOM
Slot PU3fSlot FOx
SWT 3000
RS422
DLE
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Figure 4: Optical fibre connection SWT 3000 – SWT 3000
Two SWT 3000 are direct connected via optical fibre. The transmission is carried out with 2Mbit/s.
Fibre optic module: SFP-Module
Fibre type: Single mode
Wave length: 1300 nm or 1500 nm
Opt. connector: LC-connector
Range depending on SFP module and bit rate
LED: Receiver alarm
2 x LED: TX- and RX-Alarm (RX + F6UE-Alarm)
Clock: DTE or DCE adjustable
Mode of operation: analog
F6 Modulation:
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.
Security: 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.
Coded tripping (CT): The CT function is available for the analog line interface (LIA). The com-
mand codes consist of two simultaneously transmitted trip frequencies
(parallel coding).
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