Communication Via Built-In X.21 Galvanic Interface; Service Settings For The Line Differential Protection Ied With X.21 Galvanic Interface; Pdh Telecommunication Via C37.94 Interface To External Transceiver C37.94-X.21 - Hitachi 670 Series Application Manual

1MRK505382-UEN Rev. K
5.4.5

Communication via built-in X.21 galvanic interface

LOCAL
IEC07000259 V2 EN-US
Figure 68:
IED
X.21
PCM
5.4.5.1 Service settings for the line differential protection IED with X.21 galvanic
interface
X.21 Micro D-sub 15–pole male connector according to V11 (X:27) balanced version is used for X.21
communication.
5.4.5.2 PDH telecommunication via C37.94 interface to external transceiver
C37.94-X.21
When the distance between IED and PCM equipment is more than 10 meters and an X.21 interface
on the PCM needs to be used, it can be accomplished by using an external converter from C37.94 to
X.21.
Communication set-up, 670/650 series
Application Guide
< 10 m
IED PCM
Built-in X.21
galvanic
interface
Communication structure via built-in X.21 galvanic interface
Terminal used for binary signal transfer
Built-in galvanic iterface
Pulse code multiplexer
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GUID-C0B90D43-0B15-4B17-835D-64114CF968E9 v1
REMOTE
< 10 m
PCM IED
Built-in X.21
galvanic
interface
IEC07000259-2-en.vsdx
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Section 5
Communication set-up
71