5.5.2 Communication structure via C37.94 interface to transceiver
21-216
GUID-0072DAE4-B2D8-4866-B820-4E7B3F8B1CDA v1
LOCAL REMOTE
< 10 m
IED
C37.94
Transceiver
21-216xx
PCM
Multi-mode
fibre-optic
< 3 km
Galvanic
connection
interface
G.703
Internal clock
(master)
External clock
(slave)
External clock
IEC07000260-1-en.vsdx
IED
C37.94
< 10 m
Transceiver
21-216xx
PCM
(slave)
Galvanic
connection
interface
G.703
Multi-mode
fibre-optic
< 3 km
IEC07000260 V1 EN-US
Figure 70: Communication structure via C37.94 interface to transceiver 21–216
IED
Terminal used for binary signal transfer
Transceiver 21–216 Optical-to-electrical interface converter
PCM Pulse code multiplexer
5.5.3 Setting up transceiver 21–216
GUID-0206E4D5-50DA-49E2-80E3-4F89A2540A7B v1
Confirm that the attenuation of the fibre-optic cable, including splices and patch cables, does not
exceed the system budget. Remember to add a safety margin (minimum 3dB).
Make sure that the local fibre-optic transmitter (marked Tx) is connected to the remote unit's fiber-
optic receiver (marked Rx). Local Rx is to be connected to remote Tx.
1MRK505382-UEN Rev. K Section 5
Communication set-up
Communication set-up, 670/650 series 73
Application Guide
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