ABB Relion 670 Series Applications Manual page 579

1MRK 511 401-UEN Rev. K
Long-range LDCM: Typical distance 120 km for
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.
The HighPower setting adds 3 dBm extra optical power and can be used to increase the
margin at distances close to maximum.
Table 91:
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 92: Example of input data for calculating the optical budget (maximum distance)
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
Table 93: Example of calculating the optical budget (maximum distance)
Type of LDCM
Type of fibre
Modem type
Maximum distance
Attenuation in
fibre-optic cables
Table continues on next page
Bay control REC670
Application manual
Optical budgets with C37.94 protocol
Short range (SR)
Multi-mode fiber
glass 50/125 μm
1MRK0002122-AB
ST
–21 dBm
–32.5 dBm
11.5 dB
2)
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
Short range (SR)
Multi-mode fiber
glass 50/125 μm
1MRK0002122-AB
2 km
6 dB
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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
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 km 80 km
9 dB 25.6 dB
Section 22
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
Long range (LR)
Single-mode fiber
glass 9/125 μm
1MRK002311-BA
120 km
25.2 dB
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