NEC NEFAX 671 User Manual page 260

9.2 Getting Ready
About the LEDs
LED1 (LINK):
LED2 (ACT):
This LED ligths up when the network cable is connected
correctly. If this LED is not lit, check the connection
again, even if the copier appears to be connected
correctly. If this LED is not lit when both ends are
connected correctly, the network cable may be
damaged.
This LED blinks when data is being transferred.
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