LOCAL REMOTE
< 10 m
IED
C37.94
C37.94/X.21
converter
PCM
Multi-mode
fibre-optic
< 3 km
Galvanic
connection
interface
G.703
Internal clock
(master)
External clock
(slave)
External clock
IEC18000099-1-en.vsdx
IED
C37.94
< 10 m
PCM
(slave)
Galvanic
connection
interface
G.703
Multi-mode
fibre-optic
< 3 km
C37.94/X.21
converter
IEC18000099 V1 EN-US
Figure 69: PDH Communication structure using PCM with X.21
Contact your local Hitachi Power grids representative for more details about C37.94 to
X.21 converters.
5.5 PDH telecommunication via C37.94 interface to
transceiver 21-216
5.5.1 Communication requirements
GUID-1BF17CA3-93F5-4661-9695-368FE7F359E2 v1
A PDH telecommunication network set-up can be done via 64 kbit/s C37.94 interface to transceiver
type 21-216.
There is a short delay in alarm time, typically 100 ms, for a communication fail in the relay, and it is
derived from the dependability of the line differential protection function. This requires a high quality
communication system as defined in Appendix
Sample specification of communication requirements.
If the telecommunication network is disturbed for more than 100 ms, an alarm will be issued.
Section 5 1MRK505382-UEN Rev. K
Communication set-up
72 Communication set-up, 670/650 series
Application Guide
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