Fluke DTX Series - The Alternate Method

DTX Series CableAnalyzer
Technical Reference Handbook
B-8
The Alternate Method
Like Method B/A.1, the alternate method described in
this section produces results that account for the loss of
two connections plus the fiber in the link. The advantage
of this method is that you can test links that have small
form-factor (SFF) connectors or different connector styles
at each end.
Figure B-4 shows reference and test connections for the
alternate method. The link under test has MT-RJ
connectors at one end, and LC connectors at the other
end.
Using an SC to MT-RJ patch cord and an SC to LC patch
cord for reference and test connections may seem like
the an easier way to connect to the link; however, that
would require an MT-RJ to LC patch cord for reference
connections. The reference and test connections would
be the Method C/A.3 configuration, as shown in Figure
B-3. The loss results would account for the loss of only
the fiber in the link.
To account for the loss of both connections in the link,
you must add connections to each end after referencing,
as shown at the bottom of Figure B-4. Each fiber path
then has four connections. Since two connections were
canceled out during referencing, the test results include
the loss of the two connections at the ends of the link.
You may also use the alternate method to test links that
have the same connector style at both ends. For
referencing, use the connections shown at the top of
Figure B-4. For testing, add the appropriate short patch
cords at each end. Figure B-5 shows two examples of
these test connections: one for a link with SC connectors
at both ends, and one for a link with MT-RJ connectors at
both ends.