IDEAL INDUSTRIES Inc. 7-1
7 Troubleshooting & Frequently Asked Questions
Failing DHCP Tests
Upon performing a wire map test, SIGNALTEK sends a low
voltage pulse down the cable to detect the presence of a short or
open condition. Many Cisco
®
(and possibly other brand) switches
will detect this pulse and temporarily de-activate the port. When
this happens SIGNALTEK will be unable to request an IP address
and the DHCP and Ping tests will fail.
To prevent this from occurring, go to SIGNALTEK’s Autotest
Preferences screen and de-select the Wire map test. Doing this will
allow the Link Establishment, DHCP, and Ping tests to function
normally.
Failing Wire map when testing active LAN links
Most 10/100 switches and PC interface cards internally short or
ground the unused (4/5 and 7/8) pairs to prevent EMI/RFI on the
cable. SIGNALTEK detects these shorts and notifies the user of
their presence. This is a function of the Ethernet device and cannot
be changed, but it does not represent a cabling problem. A short
on the 1/2 or 3/6 pair is critical since this indicates a cabling fault
and needs to be corrected.
Wire map/length passes with no cable connected
In the no-link (open ended) configuration, SIGNALTEK expects to
see an open condition for each conductor. In this test, there is no
minimum cabling length required and the test will only indicate a
failure when a short is detected.
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