7SR18 Performance Specification
Unrestricted ©2018 Siemens Protection Devices Limited
Page 11 of 44
1.5 Protection Interfaces and Connections
1.5.1 Differential Protection
Description / Attribute Value
Number of Devices for protected zone 2
1.5.2 Protection Interfaces
Type Value
Optical Fibre Data Interface
Maximum Distance Multi-Mode Up to 2 km
1)
Protocol Full Duplex
Connector Type ST
TM
(BFOC/2.5)
Transmission Level
max -10 dBm
ave
min -15 dBm
ave
Typical -12 dBm
ave
Receiver Sensitivity -24 dBm
ave
Optical Wavelength 820 nm
Optical Budget 12 dB
LED Class 1 Using multi-mode fibre 62.5 µm / 125 µm
Range
Assume a path attenuation of 3.5 dB/km (5.6 dB / mile) for multi-mode
fibre. For multi-mode fibre you must additionally take the product of the
bandwidth lengths into consideration.
1)
Based on fibre attenuations: -
Assumes no joins in the fibre, but includes a 3 dB safety margin.
Actual losses for specific application should be calculated using cable manufacturers data or by direct measurement using
specialised equipment.
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