Remote communication
M12756-1 v13
Table 163. Line data communication module
Characteristic Range or value
Type of LDCM Short range (SR) Medium range (MR) Long range (LR)
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
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
1550 nm
1580 nm
1520 nm
Optical budget
Multi-mode fiber glass 62.5/125 mm
18.8 dB (typical
distance about 3
km/2 mile *)
26.8 dB (typical
distance 80 km/50
mile *)
28.7 dB (typical
distance 110 km/68
mile *)
Multi-mode fiber glass 50/125 mm
11.5 dB (typical
distance about 2
km/1 mile *)
Optical connector Type ST Type FC/PC Type FC/PC
Protocol C37.94 C37.94
implementation **)
C37.94
implementation **)
Data transmission Synchronous Synchronous Synchronous
Transmission rate / Data rate 2 Mbit/s / 64 kbit/s 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
Internal or derived
from received signal
*) depending on optical budget calculation
**) C37.94 originally defined just for multi-mode; using same header, configuration and data format as C37.94
GUID-83EC40D0-ABCF-4292-B3DF-155C3A556B76 v4
Table 164. Galvanic X.21 line data communication module (X.21-LDCM)
Quantity Range or value
Connector, X.21 Micro D-sub, 15-pole male, 1.27 mm (0.050") pitch
Connector, ground selection 2 pole screw terminal
Standard CCITT X21
Communication speed 64 kbit/s
Insulation 1 kV
Maximum cable length 10 m
Generator protection REG670
1MRK 502 074-BEN M
124 Hitachi Power Grids
© Copyright 2017 Hitachi Power Grids. All rights reserved
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