Westermo TR-36 - Manual (Page 13)

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LED indicators
LED Status Indication of
RTS OFF RTS signal is inactive
ON RTS signal is active
RD OFF No data
ON / FLASH The modem transmitting data on the DTE interface
TD OFF No data
ON / FLASH The modem receiving data on the DTE interface
DCD OFF DCD signal is inactive
ON DCD signal is active, modem has detected a carrier or the signal is
set to always on
REL OFF Reliable mode is off, direct or normal mode
ON Reliable mode is on
FLASH Reliable mode with error correction and compression
LINE OFF The modem is on-hook
ON The modem is off-hook with a established connection
FLASH Line backup interface in use
PWR OFF The modem has no power
ON The modem is up and running