Pdh Telecommunication Via C37.94 Interface To Transceiver 21-216; Communication Requirements - Hitachi 670 Series Application Manual

Section 5
Communication set-up
LOCAL
IEC18000099 V1 EN-US
Figure 69:
5.5 PDH telecommunication via C37.94 interface to
transceiver 21-216
5.5.1

Communication requirements

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
If the telecommunication network is disturbed for more than 100 ms, an alarm will be issued.
72
< 10 m
IED
C37.94/X.21
PCM
converter
C37.94
Multi-mode
fibre-optic
< 3 km
Galvanic
connection
interface
G.703
External clock Internal clock
(slave) (master)
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.
© 2017 - 2023 Hitachi Energy. All rights reserved
< 10 m
PCM C37.94/X.21
converter
Multi-mode
fibre-optic
Galvanic
connection
interface
G.703
External clock
(slave)
Sample specification of communication
Communication set-up, 670/650 series
1MRK505382-UEN Rev. K
REMOTE
IED
C37.94
< 3 km
IEC18000099-1-en.vsdx
GUID-1BF17CA3-93F5-4661-9695-368FE7F359E2 v1
requirements.
Application Guide