Table 642: Line data communication module
Characteristic Range or value
Type of LDCM Short range (SR) Medium range (MR)
Type of fiber Graded-index
multimode
62.5/125 µm
Singlemode 9/125
µm
Peak Emission Wave length
Nominal
Maximum
Minimum
820 nm
865 nm
792 nm
1310 nm
1330 nm
1290 nm
Optical budget
Graded-index multimode 62.5/125 mm,
Graded-index multimode 50/125 mm
13 dB (typical
distance about 3
km/2 mile *)
9 dB (typical
distance about 2
km/1 mile *)
22 dB (typical
distance 80 km/50
mile *)
Optical connector
Type ST Type FC/PC
Protocol C37.94 C37.94
implementation **)
Data transmission Synchronous Synchronous
Transmission rate / Data rate 64 kbit/s 64 kbit/s
Clock source Internal or
derived from
received signal
Internal or derived
from received signal
*) depending on optical budget calculation
**) C37.94 originally defined just for multimode; using same header, configuration and data format as
C37.94
22.2.13 IRIG-B time synchronization module IRIG-B
SEMOD141102-1 v1
22.2.13.1 Introduction
SEMOD141113-4 v8
The IRIG-B time synchronizing module is used for accurate time synchronizing of
the IED from a station clock.
The precision time protocol (PTP, IEC/IEEE 61850-9-3) input shall be used for
synchronizing when IEC/UCA 61850-9-2LE is used.
Electrical (BNC) and optical connection (ST) for 0XX and 12X IRIG-B support.
22.2.13.2 Design
SEMOD141098-4 v4
The IRIG-B module has two inputs. One input is for the IRIG-B that can handle
both a pulse-width modulated signal (also called unmodulated) and an amplitude
modulated signal (also called sine wave modulated). The other is an optical input
type ST for optical pulse-width modulated signal (IRIG-B 00X). The IRIG-B
module is mounted as a mezzanine card on the Analog digital conversion module
(ADM).
Section 22 1MRK 505 394-UEN A
IED hardware
844 Line differential protection RED650 2.2 IEC
Technical manual
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