ABB Relion 670 Series Applications Manual page 557

1MRK 511 401-UUS F
Long-range LDCM: Typical distance 120 km for both
An optical budget calculation should be made for the actual case. For medium range LDCM and
long range LDCM the recommendation is to use the
consumption and keep the heat dissipation at minimum.
HighPower setting adds 3 dBm extra optical power and can be used to increase the margin at
The
distances close to maximum.
Table 70: Optical budgets with C37.94 protocol
Type of LDCM
Type of fibre
Modem type
Contact type
Minimum output
1)
power
Minimum receiver
sensitivity
Optical link budget
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 71:
Type of LDCM
Type of fibre
Modem type
Typical attenuation
in fibre-optic cables
Attenuation/
Contact
Factory splice
attenuation
Repair splices
Fiber margin for
aging
Bay control REC670
Application manual
Short range (SR)
Multi-mode fiber
glass 50/125 μm
1MRK0002122-AB
ST
–21 dBm
–32.5 dBm
11.5 dB
2)
Example of input data for calculating the optical budget (maximum distance)
Short range (SR)
Multi-mode fiber
glass 50/125 μm
1MRK0002122-AB
3 dB/km
1.5 dB/ST
0.5 dB/splice
0.3 splices/km
0.25 dB/splice
0.1 splices/km
0.1 dB/km
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LowPower and HighPower .
LowPower setting to minimize the power
Short range (SR) Medium range (MR)
Multi-mode fiber Single-mode fiber
glass 62.5/125 μm glass 9/125 μm
1MRK0002122-AB 1MRK002311-AA
ST FC/PC
–13.7 dBm –3.2 dBm
–32.5 dBm –30 dBm
18.8 dB 26.8 dB
Short range (SR) Medium range (MR)
Multi-mode fiber Single-mode fiber
glass 62.5/125 μm glass 9/125 μm
1MRK0002122-AB 1MRK002311-AA
3 dB/km 0.32 dB/km
1.5 dB/ST 0.3 dB/FC/PC
0.5 dB/splice 0.08 dB/splice
0.1 splices/km 0.1 splices/km
0.25 dB/splice 0.1 dB/splice
0.1 splices/km 0.05 splices/km
0.1 dB/km 0.01 dB/km
Section 21
Remote communication
Long range (LR)
Single-mode fiber
glass 9/125 μm
1MRK002311-BA
FC/PC
–1.3 dBm
–30 dBm
28.7 dB
Long range (LR)
Single-mode fiber
glass 9/125 μm
1MRK002311-BA
0.21 dB/km
0.3 dB/FC/PC
0.08 dB/splice
0.1 splices/km
0.1 dB/splice
0.05 splices/km
0.01 dB/km
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