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Chapter 4: Operation
LGC300A-R2 724-746-5500 | blackbox.com Page 11
4. Operation
4.1 LED Operation
The Industrial SFP/SFP contains four
status LED indicators. Each LED is
dual color and has three states: off, red,
or green. A loss of signal on one SFP
causes the TX of the other SFP to turn
off. This action does not activate the
red TX Fault LED.
LED Color or State
Red OFF Green
PWR
Card does not pass
the self-test.
Unit does not
have power.
Power is applied to the
card.
All internal self-test
functions must pass
before the PWR LED is
green.
SD I
SD 2
LED transmitter has
an active fault.
No active fault
on transmitter.
LOS indication
on receiver.
Valid signal is detected
by the SFP and LED
transmitter is not in
fault.
MSA
LEDs
One or both SFPs
are not installed or
not detected. The
TX inhibit must not
be active if a SFP is
missing.* Or, both
SFPs are installed,
but their speed
settings are
different. This
condition disables
both SFPs.
N/A Indicates that both
SFPs with the same
speed are securely
installed.
* To help in troubleshooting, the Link Loss (LL) feature is always ON. That is, if a
LOS is detected on an incoming SFP port, the Optical transmitter on the other SFP
port is turned OFF. This provides a Link Loss carry forward function to alert the
device downstream of the existing problem. This function is "ON" in both directions
at the same time. The LL function is inhibited if either SFP is not installed.