ABB Relion 670 series - Page 83

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 *)
26.8 dB (typical
distance 80 km/50
mile *)
28.7 dB (typical
distance 120 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-E246395C-EA13-4A85-9568-E78FFF92FCCA v2
Table 20: Optical budgets with C37.94 protocol
Type of LDCM
Short range (SR) Short range (SR) Medium range
(MR)
Long range (LR)
Type of fibre Multi-mode fiber
glass 50/125 μm
Multi-mode fiber
glass 62.5/125
μm
Single-mode fiber
glass 9/125 μm
Single-mode fiber
glass 9/125 μm
Modem type 1MRK0002122-
AB
1MRK0002122-
AB
1MRK002311-AA 1MRK002311-BA
Contact type ST ST FC/PC FC/PC
Minimum output
power
1)
–21 dBm –13.7 dBm –3.2 dBm –1.3 dBm
Minimum receiver
sensitivity
–32.5 dBm –32.5 dBm –30 dBm –30 dBm
Optical link
budget
2)
11.5 dB 18.8 dB 26.8 dB 28.7 dB
1) Minimum output power is measured with 1 m of the selected fiber and the high power mode.
2) The optical budget includes a satisfactory margin for aging in transmitter and receiver during 20–30
years.
1MRK 505 382-UEN B Section 5
Communication set-up
Communication set-up 670/650 series 2.2 77
Application Guide