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 34:
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 35:
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
Table continues on next page
Section 20
1MRK 511 407-UEN C
Remote communication
328
Phasor measurement unit RES670 2.2 IEC
Application manual
Summary of Contents for Relion RES670
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