Type of LDCM
Short range (SR)
Short range (SR)
Medium range (MR) Long range (LR)
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.
Table 12: Example of input data for calculating the optical budget (maximum distance)
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
Typical attenuation
in fibre-optic
cables
3 dB/km
3 dB/km
0.32 dB/km
0.21 dB/km
Attenuation/
Contact
1.5 dB/ST
1.5 dB/ST
0.3 dB/FC/PC
0.3 dB/FC/PC
Factory splice
attenuation
0.5 dB/splice
0.3 splices/km
0.5 dB/splice
0.1 splices/km
0.08 dB/splice
0.1 splices/km
0.08 dB/splice
0.1 splices/km
Repair splices
0.25 dB/splice
0.1 splices/km
0.25 dB/splice
0.1 splices/km
0.1 dB/splice
0.05 splices/km
0.1 dB/splice
0.05 splices/km
Fiber margin for
aging
0.1 dB/km
0.1 dB/km
0.01 dB/km
0.01 dB/km
Table 13: Example of calculating the optical budget (maximum distance)
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
Maximum distance
2 km
3 km
80 km
120 km
Attenuation in
fibre-optic cables
6 dB
9 dB
25.6 dB
25.2 dB
2 contacts
2 dB
3 dB
0.6 dB
0.6 dB
Factory splice
attenuation
0.3 dB
0.45 dB
0.64 dB
0.96 dB
Repair splices
0.1 dB
0.3 dB
0.8 dB
1.2 dB
Fiber margin for
aging
0.2 dB
0.3 dB
0.8 dB
1.2 dB
Total attenuation
8.6 dB
12.05 dB
26.04 dB
28.56 dB
Optical link budget
9 dB
13 dB
26.8 dB
28.7 dB
Link margin
0.4 dB
0.95 dB
0.76 dB
0.14 dB
Section 4
1MRK 505 382-UEN E
Analog and binary signal transfer for line differential protection
54
Communication set-up, 670/650 series
Application Guide
© Copyright 2017 ABB. All rights reserved
Summary of Contents for Relion 670 series
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