DSP-4000 Series
Users Manual
8-14
Notes for Table 8-4
1. Verification of dynamic accuracy is required up to the specified range for NEXT loss and FEXT loss.
2. The dynamic accuracy is based on dynamic accuracy performance for insertion loss (attenuation) and NEXT
loss, and is assumed to combine the dynamic accuracy for ELFEXT as specified. The FEXT loss dynamic
accuracy is tested to ± 0.75 dB.
3. Performance verification of residual NEXT and residual FEXT is up to 85 dB maximum, with an assumed
frequency response change of 20 dB/decade.
4. Performance verification of Output Signal Balance and Common Mode Rejection is up to 60 dB maximum,
with an assumed frequency response change of 20 dB/decade.
5. The performance requirements for tracking, directivity, and source match for the permanent link adapter apply
after the permanent link adapters have been calibrated with the test tools they are attached to.
Typical Measurement Accuracies
The DSP-4000 Series test tools substantially exceed the measurement accuracy
requirements of draft Level III TIA and IEC proposals. Typical measurement
accuracy is determined as follows:
• For each performance parameter (for example, source/load return loss, residual
NEXT, etc.) at every frequency, the worst result for any wire pair or wire-pair
combination is obtained.
• The values of the worst case wire pair or wire pair combinations are
substituted in the accuracy equation given by TIA and IEC guidelines.
• Worst case assumptions for link performance that affect measurement
accuracy are used. These include the assumptions for link return loss,
common-mode-to-differential-mode gain, and differential-to-common-mode
gain.
Typical measurement accuracies are used to determine if test results are within the
test tool’s accuracy range. Results within the accuracy range are marked with an
asterisk.
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