Problem indication:
• The SYS LED on the front panel is not lit even though the DSLAM is powered up
• Alarm that indicates a system power up problem
• Aubscribers connected to the DSLAM do not have DSL service; POTS service is ok
1 Check that the power is being supplied to the DSLAM.
2 Check that the power feeds are connected to the DSLAM, and that power is present on the two
power feeds with correct polarity.
3 Replace the VX-MD4024 .
4 Contact your provider.
Problem indication:
• The GBE1/GBE2 LED on the system front panel is not lit (maybe the signal power detected by
the fiber optical receiver being below the minimum power threshold) but the SFP interface has
been activated
• Alarm that indicates loss of signal
• Subscribers connected to the DSLAM do not have DSL service; POTS service is ok
1 Check the connection of the fiber optics link. Check that the connections are secure and that the
transmit and receive connections are not reversed.
2 Disconnect the fiber optics link from the dual fiber optics connector and do a physical loopback
at the VX-MD4024 .
a If the GBE1/GBE2 LED turns green, the problem is with the fiber optics link.
b If the GBE1/GBE2 LED does not turn green, the problem is with the DSLAM. Follow
Procedure 3-1 to troubleshoot the DSLAM.
3 If the problem is with the fiber optics cabling, clean or replace as appropriate.
4 Contact your provider.
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