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The Permanent Link shown in Figure 1 includes an optional Consolidation Point. Other
Permanent Link models may have a second patch panel instead of the TO which is
typically seen in a Data Center. The Permanent Link measurement includes the RJ45
plug at the end of the test lead, but does not include the cable portion of the test lead
or connection to the test equipment (See Figure 1). In the case of the DSX Permanent
Link adapters, the RJ45 plug is guaranteed to meet the NEXT, FEXT and Return Loss
requirements of the earlier mentioned standards. The cable portion of the test lead is
removed from the measurement using calibration constants stored in the adapter.
Another Permanent Link configuration that's being seen more often nowadays is the
Modified Permanent Link. This is not recognized in TIA or ISO/IEC, but is supported in
ANSI/BICSI-004. The Modified Permanent Link is used to asses a horizontal link that
results in a direct connection to equipment like a PoE (Power over Ethernet) Wireless
Access point or CCTV camera. To assess this type of link the TIA Permanent Link test limit
must be used. The main tester must be connected via a Permanent Link adapter to the
patch panel. A Channel adapter on the remote unit at the remote end must be used to
connect the RJ45 plug of the direct connection.
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