LD
CM
LD
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LD
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LD
CM
LD
CM
LD
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LD
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LD
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LD
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en06000519-2.vsd
IEC06000519 V2 EN-US
Figure 191:
Direct fibre optical connection between two IEDs with LDCM
The LDCM can also be used together with an external optical to galvanic G.703
converter as shown in figure
. These solutions are aimed for connections to a
multiplexer, which in turn is connected to a telecommunications transmission
network (for example PDH).
Telecom. Network
*)
*)
Multiplexer
Multiplexer
en05000527-2.vsd
*) Converting optical to galvanic G.703
IEC05000527 V2 EN-US
Figure 192:
LDCM with an external optical to galvanic converter and a
multiplexer
When an external modem G.703 is used, the connection between LDCM and the
modem is made with a multimode fibre of max. 3 km length. The IEEE/ANSI
C37.94 protocol is always used between LDCM and the modem.
19.1.3
Setting guidelines
M12454-3 v6
64 kbit and 2 Mbit mode common settings
ChannelMode
defines how an IED discards the LDCM information when one of
the IEDs in the system is out of service: it can either be done on the IED out of
service by setting all local LDCMs to channel mode
OutOfService
or at the remote
1MRK 506 375-UEN A
Section 19
Remote communication
Railway application RER670 2.2 IEC
455
Application manual
Summary of Contents for RELION RER670
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