B&B Electronics 850-14940--49 - Manual - Manual (Page 6)

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LEDs on iMcV-LIM
The LED functions are as follows:
LL Glows green when FX LinkLoss is enabled.
LNK Glows green when a link is established on the port.
XMT Blinks green when port is transmitting data.
RCV Blinks yellow when port is receiving data.
FA* Glows green when FiberAlert is enabled.
*FiberAlert is not available/applicable on single-strand versions of iMcV-LIM.
LEDs on iMcV-S2MM/S2SM/M2MM
The LED functions on iMcV-S2MM/S2SM/M2MM are as follows:
ENA Glows green when port is enabled.
ACT Glows yellow in normal operation, indicating that fiber
is connected and the receiver is seeing light pulses.
(As these are protocol-independent modules, there is
no true link signal available.)