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CHAPTER 12 TROUBLESHOOTING
12
12.
3
C
hecking t
he LEDs
(7) When the LINK LED turns off
If the above actions do not solve the problem, perform the following tests on the master/local module to check for an
error.
• Hardware test (
• Self-loopback test (
• Cable test (
Check item
Action
Are 1000BASE-T-compliant Ethernet cables used?
Replace the cables with 1000BASE-T-compliant Ethernet cables.
(
Is the station-to-station distance 100m or less?
Change the station-to-station distance to 100m or less.
Does the cabling condition (bend radius) meet the
specification?
Refer to the manual for the Ethernet cable, and correct the bend radius.
Is any Ethernet cable disconnected?
Replace the Ethernet cable.
Are the switching hub and other stations connected to the
master/local module normal?
Power on the switching hub and the other stations.