devices. One possible application is the transmission of differential protection data. For example, if you wish
to transmit only binary data and measured values, you can equip all SIPROTEC devices with these protection
interfaces.
The attainable distance in multimode optical fibers is limited by 2 factors.
•
Bandwidth length product
Typical for 62.5 μm/125 μm optical fibers: 400 MHz x km to 800 MHz x km
Typical for 50 μm/125 μm optical fibers: 400 MHz x km to 1200 MHz x km
•
Fiber attenuation
The typical attenuation of a 62.5 μm/125 μm optical fiber is from 0.9 dB/km to 1 dB/km for light with the
wavelength λ = 1300 nm. 1.5 dB/km are added for splices, aging and as a reserve. An attenuation of
2.5 dB/km is used for calculation of the distance.
USART-AF-1LDFO
Description Protection-interface module for synchronous operation with an optical
interface
Product code P1Z758
Figure
Connector type 1 x duplex LC
Wavelength λ = 1300 nm
Baud rate 2 Mbit/s for the protection-interface communication
Protocol Protection-interface communication
Max. distance 24 km for singlemode optical fibers or
4 km with multimode optical fiber
Distance 4 km
Laser class 1 as per EN 60825-1/-2 With the use of 62.5 μm/125 μm and 50 μm/125 μm optical fibers
Minimum Maximum
Transmitter power coupled in
multimode optical fiber
-15.0 dBm
avg
-8.0 dBm
avg
Receiver sensitivity -8.0 dBm
avg
-31.0 dBm
avg
Optical budget 16.0 dB –
Distance 24 km
Laser class 1 as per EN 60825-1/-2 With the use of 9 μm/125 μm optical fibers
Minimum Maximum
Transmitter power coupled in
singlemode optical fiber
-15.0 dBm
avg
-8.0 dBm
avg
Receiver sensitivity -8.0 dBm
avg
-31.0 dBm
avg
Optical budget 16.0 dB –
4.2.4.2
Plug-In Modules
4.2 Communication Modules
164 SIPROTEC 5, Hardware Description, Manual
C53000-G5040-C002-J, Edition 08.2020
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