IEC06000393 V3 EN-US
Figure 64: MR-LDCM and LR-LDCM layout with two PCI connectors and one I/O FC/PC
type connector
M12756-1 v14
Table 19: 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
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 mm 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 64 kbit/s 64 kbit/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.
Section 5 1MRK505382-UEN Rev. K
Communication set-up
66 Communication set-up, 670/650 series
Application Guide
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