Hitachi 670 Series Application Manual page 73

1MRK505382-UEN Rev. K
Table 20:
Type of LDCM
Type of fibre
Modem type
Contact type
Maximum output
1)
power
Minimum receiver
sensitivity
Optical link budget
1) Maximum output power is measured with 1 m of the selected fiber and the high power mode.
2) Applicable for revision r11 and later.
3) The optical budget includes a satisfactory margin for aging in transmitter and receiver during 20–30 years.
Table 21:
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 22:
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
Table continues on next page
Communication set-up, 670/650 series
Application Guide
Optical budgets with C37.94 protocol
Short range (SR)
Multi-mode fiber
glass 50/125 μm
1MRK0002122-AB
ST
–18.2 dBm
–30 dBm
3) 9 dB
Example of input data for calculating the optical budget (maximum distance)
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
Example of calculating the optical budget (maximum distance)
Short range (SR)
Multi-mode fiber
glass 50/125 μm
1MRK0002122-AB
2 km
6 dB
3
dB
0.5 dB
0.25 dB
0.2 dB
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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
- 1.2 dBm
–32.5 dBm –32 dBm
18.8 dB 28.8 dB
30.8 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
3 dB 0.6 dB
0.5 dB 0.64 dB
0.25 dB 0.4 dB
0.3 dB 0.8 dB
Communication set-up
GUID-E246395C-EA13-4A85-9568-E78FFF92FCCA v4
Long range (LR)
Single-mode fiber
glass 9/125 μm
1MRK002311-BA
FC/PC
–1.3 dBm
2)
–32 dBm
30.7 dB
2)
GUID-B028E97A-88BE-4AFB-B06E-D05FACA14A8C v4
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
0.96 dB
0.6 dB
1.2 dB
Section 5
67