ABB REL670 2.2 IEC Applications Manual page 854

Section 22
Remote communication
848
Type of LDCM Short range (SR)
Minimum output –21 dBm
1)
power
Minimum receiver –32.5 dBm
sensitivity
Optical link 11.5 dB
2)
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 63: Example of input data for calculating the optical budget (maximum distance)
Type of LDCM Short range (SR)
Type of fibre Multi-mode fiber
glass 50/125 μm
Modem type 1MRK0002122-
AB
Typical 3 dB/km
attenuation in
fibre-optic cables
Attenuation/ 1.5 dB/ST
Contact
Factory splice 0.5 dB/splice
attenuation 0.3 splices/km
Repair splices 0.25 dB/splice
0.1 splices/km
Fiber margin for 0.1 dB/km
aging
Table 64: Example of calculating the optical budget (maximum distance)
Type of LDCM Short range (SR)
Type of fibre Multi-mode fiber
glass 50/125 μm
Modem type 1MRK0002122-
AB
Maximum 2 km
distance
Attenuation in 6 dB
fibre-optic cables
2 contacts 2 dB
Table continues on next page
Short range (SR) Medium range
(MR)
–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 glass 9/125 μm
μm
1MRK0002122- 1MRK002311-AA
AB
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 glass 9/125 μm
μm
1MRK0002122- 1MRK002311-AA
AB
3 km 80 km
9 dB 25.6 dB
3 dB 0.6 dB
Line distance protection REL670 2.2 IEC
1MRK 506 369-UEN B
Long range (LR)
–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
0.6 dB
Application manual