21-216
(local)
TX
RX
RX
TX
RJ
RJ
RX
TX
TX
RX
Multi-mode
optical fiber
E
IED
(local)
E
G.703
cable
< 10 m
IEC07000155-1-en.vsdx
Multi-mode
optical fiber
21-216
(remote)
IED
(remote)
IEC07000155 V1 EN-US
Figure 78: Communication structure for laboratory testing
5.6
PDH/SDH telecommunication via C37.94 interface to
transceiver 21-219
GUID-42A1D332-A59D-49F9-9821-719F3A993774 v1
5.6.1
Communication requirements
GUID-DCDF94BA-73EE-4970-86AB-676F1E53634D v1
PDH/SDH telecommunication network set-up can be done via 64 kbit/s or 2 Mbit/s C37.94
interface to transceiver type 21-219.
Communication quality in PDH telecommunication networks is usually lower than in SDH
telecommunication networks due to less stable master clocks. The bit error rate is typically
BER10
-6
.
An SDH telecommunication network with an accurate master clock usually enables high quality
communication with very low bit error rate (BER10
-9
).
Communication system requirements are defined in Appendix
.
5.6.2
Communication structure with transceiver 21-219 port
synchronized from SDH master clock
GUID-0146A8BA-6425-43DE-8945-D1E18A1B82F3 v1
Setting up an SDH telecommunication network requires that transceiver 21-219 port is
synchronized from the SDH network master clock (see Figure
). The SDH multiplexer (SDH
MUX) must be configured to fulfil this requirement. The settings are vendor dependent, but
usually SDH MUX is to be set for re-timing, and the format is to be set according to G.704
standard (framed, structured, unstructured, and so on). The transparent format cannot be
used in SDH telecommunication networks because there is no synchronization available in the
transceiver 21–219 SDH port.
1MRK 505 382-UEN E
Section 5
Communication set-up
Communication set-up, 670/650 series
77
Application Guide
© Copyright 2017 ABB. All rights reserved
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