10
While the CNT 10 L can identify a bad cable, it cannot
determine if the wire or the connectors are at fault. The
user must examine the different parts of the cable to
determine the cause of failure and take the appropriate
steps to correct the problem.
7.3 Which end is bad?
The CNT 10 L like many cable
testers, cannot find the location of the faul, or even
determine which end or connector is bad. lt simply
knows that a fault exists. The user must locate the fault
and take the appropriate action.
7.4 Cables with Molded on ends:
Many cables have
molded on ends that cannot be opened up for repair.
The entire cable must be replaced, or the molded on
end removed and replaced with a user serviceable
connector. These types of cables usually fail from
Opens or Shorts. They seldom fail from a Crossed
connection.
7.5 Cables with Crimped on RJ connectors:
Crim-
ped on RJ connectors cannot be reused or repaired.
New connectors must be installed on the cable. If the
cable being tested has just been made up or put in ser-
vice, and it tests as Open or Crossed, the RJ connec-
tors have probably been installed incorrectly. Shorts
very seldom occur as the result of a badly crimped RJ
connector, so the user should suspect a problern with
the wire (possibly a staple or mail through the wire, or
a crushed or pinched wire) if the CNT 10 L indicates a
short. A visual examination of the RJ connectors may
reveal the fault··· but keep in mind that whatever the
cause of a connector problem (i.e. miswiring, improper
stripping of the wire, bad crimp, etc.) The only solution
is to replace the connector. Consequently, it is not
necessary for the user to know the exact cause of the
problem, simply to make sure that he installs the new
connector correctly!
7.6 Conflicting Results:
Sometimes, the tests results
of the tester seem to conflict with the performance of
the cable ··· i.e., the cable tests badly but works OK,
or vice versa. The following items Iist some of the
reasons why.
7.6.1 The tester lndicates the cable is not working,
but my LAN works oK:
Installed LAN cables with
RJ- 45 connectors that bave been in service and
working OK may lest as Open, Shorted, or Crossed.
Here‘s why·· ·
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