Real Time Clock - Siemens 7SR242 Duobias Technical Manual

1.3.2.6 Fibre Optic Ethernet Data Communication Interface (IEC 61850 Option)
Attribute
Physical Layer
Connectors
Recommended Fibre
Transmission Speed
Optical Wavelength
Bridgeable distance
1.3.2.7 Electrical Ethernet Data Communication Interface (IEC 61850 Option)
Attribute
Physical Layer
Connectors
Transmission Speed
Test Voltage (with regard to socket)
Bridgeable distance
1.3.3

Real Time Clock

1.3.3.1 Internal Clock
The specification below applies only while no external synchronisation signal (e.g. IRIG-B, IEC 60870-5-103) is
being received.
Attribute
o
Accuracy (-40 to +85 C)
1.3.3.2 IRIG-B
Attribute
Connector
Signal Type
Applied signal level
Signal : carrier ratio
Input Impedance
©2015 Siemens Protection Devices Limited
Chapter 3) 7SR242 Duobias Performance Specification
Value
Fibre Optic
Duplex LC 100BaseF in acc. With IEEE802.3
62.5/125 m glass fibre with Duplex-LC connector
100MBit/s
1300nm
2km
Value
Electrical
RJ45 100BaseF in acc. With IEEE802.3
100MBit/s
500 VAC 50 Hz
20m
Value
3.5 ppm (No auxiliary supply connected)
100 ppm (Auxiliary supply connected)
Value
BNC
IRIG-B 120, 122 or 123
minimum 3 V, maximum 6 V, peak-to-peak
3
4k Ohms Approx.
Chapter 3 Page 14 of 50