ABB RELION 650 Series Applications Manual page 338

Section 18
Remote communication
Table 38: 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 39: Example of calculating the optical budget (maximum distance)
Type of LDCM
Type of fibre
Modem type
Maximum distance
Attenuation in fibre-
optic cables
2 contacts
Factory splice
attenuation
Repair splices
Fiber margin for aging
Total attenuation
Optical link budget
Link margin
TransmCurr : This setting decides which of 2 possible local currents that shall be transmitted,
or if and how the sum of 2 local currents shall be transmitted, or finally if the channel shall be
used as a redundant channel.
CT-GRP1 or CT-GRP2 will transmit the respective CT group, and the setting RedundantChannel
makes the channel be used as a backup channel.
ComFailAlrmDel : Time delay of communication failure alarm. In communication systems, route
switching can sometimes cause interruptions with a duration up to 50 ms. Thus, a too short
time delay setting might cause nuisance alarms in these situations.
ComFailResDel : Time delay of communication failure alarm reset.
RedChSwTime : Time delay before switchover to a redundant channel in case of primary
channel failure.
RedChRturnTime : Time delay before switchback to a the primary channel after channel failure.
332
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
2 dB
0.3 dB
0.1 dB
0.2 dB
8.6 dB
9 dB
0.4 dB
Short range (SR)
Multi-mode fiber glass
62.5/125 μm
1MRK0002122-AB
3 dB/km
1.5 dB/ST
0.5 dB/splice
0.1 splices/km
0.25 dB/splice
0.1 splices/km
0.1 dB/km
Short range (SR)
Multi-mode fiber glass
62.5/125 μm
1MRK0002122-AB
3 km
9 dB
3 dB
0.45 dB
0.3 dB
0.3 dB
12.05 dB
13 dB
0.95 dB
1MRK 505 363-UEN A
Medium range (MR)
Single-mode fiber glass
9/125 μm
1MRK002311-AA
0.32 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
Medium range (MR)
Single-mode fiber glass
9/125 μm
1MRK002311-AA
80 km
25.6 dB
0.6 dB
0.64 dB
0.8 dB
0.8 dB
26.04 dB
26.8 dB
0.76 dB
Application manual