Table 23: 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
Factory splice
attenuation
0.3 dB
0.45 dB
0.64 dB
0.96 dB
Repair splices
0.1 dB
0.3 dB
0.8 dB
1.2 dB
Fiber margin for
aging
0.2 dB
0.3 dB
0.8 dB
1.2 dB
Total attenuation
8.6 dB
12.05 dB
26.04 dB
28.56 dB
Optical link budget
9 dB
13 dB
26.8 dB
28.7 dB
Link margin
0.4 dB
0.95 dB
0.76 dB
0.14 dB
5.4
Galvanic X.21 line data communication (X.21-LDCM)
GUID-75B89AAC-1A2D-4774-B357-88F7AB7F392A v1
5.4.1
Introduction
GUID-D02150FC-54F5-4CE4-8D3D-9F8796B6A527 v3
The galvanic X.21 line data communication module is used for connection to
telecommunication equipment, for example leased telephone lines. The module supports 64
kbit/s data communication between IEDs.
Examples of applications:
•
Line differential protection
•
Binary signal transfer
5.4.2
Design
GUID-0570749A-516C-47D6-A818-83416759BA90 v5
The galvanic X.21 line data communication module uses a ABB specific PC*MIP Type II format.
Section 5
1MRK 505 382-UEN E
Communication set-up
66
Communication set-up, 670/650 series
Application Guide
© Copyright 2017 ABB. All rights reserved
Summary of Contents for Relion 670 series
Page 1: ...Relion 670 650 SERIES Communication set up 670 650 series Version 2 2 Application Guide...
Page 2: ......
Page 10: ...4...
Page 99: ...93...