ABB Relion 670 series - Page 84

GUID-B028E97A-88BE-4AFB-B06E-D05FACA14A8C v2
Table 21: 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 22: 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 5 1MRK 505 382-UEN B
Communication set-up
78 Communication set-up 670/650 series 2.2
Application Guide