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2.7 Performing Loop Back Test
To perform a loop back test between a local MC and a remote MC con-
nected by a fiber cable, the steps are:
1. Push and press Loop back test button of local MC.
2. Check RTP LINK LED. It blinks to indicate the MC is in loop back
test mode.
3. Check RTP 100M LED. It is ON to indicate a complete of loop back
test and OFF during test.
4. Check RTP FDX LED for the test result. It is ON to indicate a TEST
PASS and OFF for TEST FAIL.
5. Release Loop back test button. RTP LINK/100M/FDX LEDs are back
to display remote TP port status.
Summary of Loop Back Test LEDs
LED
Status
Interpretation
RTP LINK
Blink
The MC is on Loop Back Test mode.
RTP 100M
On
Loop back test complete
Off
Loop back test in operation
RTP FDX
On
Loop back test Ok
Off
Loop back test fail
