Remote communication
M12756-1 v14
Table 142. Line data communication module
Characteristic
Range or value
Type of LDCM
Short range (SR)
Medium range (MR)
Type of fiber
Multi-mode fiber
glass 62.5/125 µm
Multi-mode fiber
glass 50/125 µm
Single-mode fiber
glass 9/125 µm
Peak Emission Wave length
Nominal
Maximum
Minimum
820 nm
865 nm
792 nm
1310 nm
1330 nm
1290 nm
Optical budget
Multi-mode fiber glass 62.5/125
m
m
18.8 dB (typical
distance about 3
km/2 mile
1)
28.8 dB (typical
distance 80 km/50
mile
1)
30.8 dB
2)
Multi-mode fiber glass 50/125
m
m
11.8 dB (typical
distance about 2
km/1 mile *)
Optical connector
Type ST
Type FC/PC
Protocol
C37.94
C37.94
implementation
3)
Data transmission
Synchronous
Synchronous
Transmission rate / Data rate
2 Mbit/s / 64 kbit/s
2 Mbit/s / 64 kbit/s
Clock source
Internal or derived
from received signal
Internal or derived
from received signal
1)
depending on optical budget calculation
2)
Applicable for revision r11 of MR LDCM and later.
3)
C37.94 originally defined just for multi-mode; using same header, configuration and data format as C37.94
Class 1 laser product. Take adequate
measures to protect the eyes. Never look
into the laser beam. Complies to laser
safety classification according to IEC
60825-1.
Line distance protection REL650
1MRK 506 384-BEN H
Version 2.2
100
Hitachi Power Grids
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Содержание REL650 series
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