Loss Test Methods for Fiber Cabling
The Alternate Method
B-11
B
The Alternate Method
Like Method B/A.1, the alternate method produces results
that account for the loss of two connections plus the fiber
in the link.
An advantage of this method is that you can test links that
have different connector styles at each end.
Figure B-6 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 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-6. 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. As with
modified Method B, this method lets you test links when
you do not have the correct connector adapters for the
tester. For referencing, use the connections shown at the
top of Figure B-6. For testing, add the appropriate short
patch cords at each end. Figure B-7 shows an example of
these test connections for a link with MT-RJ connectors at
both ends.
On the tester select Method B as the Test Method when
using these alternate connections.
To Next Page
Loading...
Need help?
General
