7SR21 & 7SR22 Performance Specification
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1.3.7 Fibre Optic Ethernet Data Communication Interface (IEC 61850 Option)
Attribute Value
Physical layer Fibre-optic
Connectors Duplex LC 100BaseF in acc. With IEEE802.3
Recommended fibre
62.5/125 mm glass fibre with Duplex-LC connector
Transmission Speed 100 MBits/s
Optical Wavelength 1300 nm
Bridgeable distance 2 km
1.3.8 Electrical Ethernet Data Communication Interface (IEC 61850 Option)
Attribute Value
Physical layer Electrical
Connectors RJ45 100BaseF in acc. With IEEE802.3
Transmission Speed 100 MBits/s
Test Voltage (with regard to socket) 500 VAC 50 Hz
Bridgeable distance 20 m
1.3.9 Real Time Clock
1.3.9.1 Internal Clock
The specification below applies only while no external synchronisation signal (e.g. IRIG-B, IEC 60870-5-103) is
being received.
Attribute Value
Accuracy (- 10
o
C to + 55
o
C)
± 100 ppm
1.3.9.2 IRIG-B (Inter Range Instrumentation Group)-B
Attribute Value
Connector BNC
Signal Type IRIG-B 120, 122 or 123
Applied signal level minimum 3 V, maximum 6 V, peak-to-peak
Signal : carrier ratio 3:1
Impedance 4 kOhm
*Cable impedance is irrelevant. The cable does not need to have a termination resistor fitted.
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