Remote communication
M12756-1 v14
Table 199. 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
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)
28.7 dB (typical
distance 120 km/75
mile
1)
Multi-mode fiber glass 50/125
m
m
11.8 dB (typical
distance about 2
km/1 mile
1)
Optical connector
Type ST
Type FC/PC
Type FC/PC
Protocol
C37.94
C37.94
implementation
3)
C37.94
implementation
3)
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
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.
GUID-83EC40D0-ABCF-4292-B3DF-155C3A556B76 v4
Table 200. 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
Line differential protection RED670
1MRK 505 379-BEN R
Version 2.2
152
Hitachi Energy
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