Hitachi 670 Series Application Guide

GUID-E246395C-EA13-4A85-9568-E78FFF92FCCA v4
Table 20: Optical budgets with C37.94 protocol
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
Contact type ST ST FC/PC FC/PC
Maximum output
power
1)
–18.2 dBm –13.7 dBm –3.2 dBm
- 1.2 dBm
2)
–1.3 dBm
Minimum receiver
sensitivity
–30 dBm –32.5 dBm –32 dBm –32 dBm
Optical link budget
3)
9 dB 18.8 dB 28.8 dB
30.8 dB
2)
30.7 dB
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.
GUID-B028E97A-88BE-4AFB-B06E-D05FACA14A8C v4
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 3
dB
3 dB 0.6 dB 0.6 dB
Factory splice
attenuation
0.5 dB 0.5 dB 0.64 dB 0.96 dB
Repair splices 0.25 dB 0.25 dB 0.4 dB 0.6 dB
Fiber margin for
aging
0.2 dB 0.3 dB 0.8 dB 1.2 dB
Table continues on next page
1MRK505382-UEN Rev. K Section 5
Communication set-up
Communication set-up, 670/650 series 67
Application Guide
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Hitachi 670 Series Specifications

General

Brand	Hitachi
Model	670 Series
Category	Control Unit
Language	English