ABB ProtectIT REL 551 2.5 Installation And Commissioning Manual page 74

Differential protection terminal
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Configuring the short range galvanic modem
Table 7:
Indications
LED
Explanation
DCD
Detection of carrier signal
TD
Transmitted data
RD
Received data
Chapter 8
Configuring the 56/64 kbit data
communication modules
65

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