ABB REL 551-C1 2.3 Series Installation And Commissioning Manual page 54

Line differential protection terminal
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48
Configuring the short range fibre optical
modem
There are also some indication for supervision of the communication channel that can
be seen when the cover around the fibre optic connectors is removed. These LED's are
found above DIP-switch. The function of the LED's are explained in table 3.
Table 3: Indications
LED
Colour
Explanation
RTS
Yellow
Request to send
CTS
Yellow
Clear to send
DSR
Yellow
Data communication correct
DCD
Yellow
Detection of carrier signal
TXD
Yellow
Transmitted data
RXD
Yellow
Received data
RA
Red
Remotely detected problem with link
MA
Red
Memory function for problem with link
LO
Green
Link operation correctly
LA
Red
Locally detected problem with link
Sync
Green
Used when synchronisation is selected
Chapter 8
Configuring the digital
communication modules

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