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The maximum allowed length of the Permanent Link is 90 meters. This link is most
often used by installers to prove the xed portion of the cabling system (excluding
user cords) meets the requirements of ANSI/TIA/EIA-568 or ISO/IEC 11801. The cabling
vendor offering the warranty will require this. If you see an installer making these
measurements using Channel adapters, you may wish to stop them and ask why they are
not making Permanent Link measurements.
Figure 1
To obtain meaningful results, it is essential to select the appropriate autotest and link
model.
Permanent Link
The Permanent Link performance is dened in such a way that after adding good patch
cords to a passing link, the channel performance is automatically met. By good patch
cords, we mean patch cords that pass the same class or category rating as the link or a
higher level of performance.
For this reason, it is recommended that new cabling installations are certied using
the Permanent Link model and test standard. Patch cords and equipment cords may be
changed many times during the life of the permanent link.
Link models
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