The permanent link has been defined in TIA568 B and ISO 11801
AM2, and includes: all the permanently installed horizontal
cable, the mated connection at the wiring closet end of the
link, the telecommunications outlet at the far end of the link,
and an optional transition point (used forexample in the case
of modular furniture).
The permanent link is used to verify the performance of permanently
installed cabling. It differs from the basic link in that
it does not include the field tester cord. Of the course,
the field tester cord is necessary, but this link definition
requires the field tester to somehow compensate for all the
characteristics of the cord so that as much as possible the
test cord is invisible to the measurement. This is very difficult
to do, and to be done properly requires very sophisticated
electronics and software in the field tester. The permanent
link definition does include the mated plug at the end of
the field tester cord, but not the cord itself.
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