Galvanic X.21 Line Data Communication (X.21-Ldcm); Introduction; Design - Hitachi 670 Series Application Manual
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Also See for 670 Series:
- Applications manual (438 pages) ,
- Commissioning manual (284 pages) ,
- Product manual (192 pages)
Table of Contents
Section 5
Communication set-up
Type of LDCM
Total attenuation
Optical link budget
Link margin
1) Applicable for revision r11 and later.
5.4
Galvanic X.21 line data communication (X.21-LDCM)
5.4.1
Introduction
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
The galvanic X.21 line data communication module uses a Hitachi Energy specific PC*MIP Type II
format.
IEC07000196 V2 EN-US
Figure 65:
68
Short range (SR)
9.95 dB
11.8 dB
1.85 dB
Overview of the X.21 LDCM module
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Short range (SR)
Medium range (MR)
13.05 dB
28.04 dB
18.8 dB
28.8 dB
30.8 dB
5.75 dB
0.76 dB
2.76 dB
IEC07000196-2-en.vsdx
1MRK505382-UEN Rev. K
Long range (LR)
28.56 dB
28.7 dB
1)
0.14 dB
1)
GUID-75B89AAC-1A2D-4774-B357-88F7AB7F392A v1
GUID-D02150FC-54F5-4CE4-8D3D-9F8796B6A527 v3
GUID-0570749A-516C-47D6-A818-83416759BA90 v7
Communication set-up, 670/650 series
Application Guide
Table of Contents
