FIELD TESTER CAPABILITY FOR BALANCE MEASUREMENT

Transcription

1 FIELD TESTER CAPABILITY FOR BALANCE MEASUREMENT Everett, WA Brillhart 8.3bq NGBT Task Force Geneva, 3

2 INTRODUCTION Definitions of Balance measurements. Measurement Procedures used for this contributions Overlay and accuracy Results for channel & PL measurements of TCL and ELTCTL Other possible measurement Conclusions Brillhart 8.3bq NGBT Task Force Geneva, 3

3 DEFINITIONS The above diagrams are copied from TIA568 C. and clarify the definition of the TCL and TCTL, as well as showing the main points of the test configuration Brillhart 8.3bq NGBT Task Force Geneva, 3 3

4 DESCRIPTION OF RESULTS Overlay plots are shown without processing for both VNA and field tester results. Accuracy plots were calculated by normalising the voltage difference between the field tester and VNA results against the limit line according to TIA 5, section Comparison method using full frequency responses. The limit lines used for these calculations were the Draft TIA Cat 8 channel limits for TCL and ELTCTL to MHz. This trials were conducted as part of an evaluation of field testers to Level V requirements, so all results are displayed to MHz. Results using 3m PL are shown in the presentation, additional results using 6m and 9m CH & PLs are included as an Appendix to this presentation. Brillhart 8.3bq NGBT Task Force Geneva, 3 4

5 CHANNEL MEASUREMENT SETUP All VNA measurements were taken using procedures for direst 6 port characterisation using the fixtures shown. All results were converted to terminations. Cables were calibrated using Ecal, hence fixtures are included in VNA measurement. Brillhart 8.3bq NGBT Task Force Geneva, 3 5

6 CHANNEL MEASUREMENT SETUP The channel configurations with the following topology were used: 3m 3m 3m 3m 6m 3m 3m 9m 3m All cable products were 5MHz Cat 6A RJ45. Brillhart 8.3bq NGBT Task Force Geneva, 3 6

7 3M CHANNEL TCL RESULTS Limit Mag. INT VNA Limit 36 Mag. INT VNA Limit 45 Mag. INT VNA Limit 78 Mag. INT VNA Brillhart 8.3bq NGBT Task Force Geneva, 3 7

8 3M CHANNEL TCL ACCURACY VNA VNA 36 VNA 45 VNA Brillhart 8.3bq NGBT Task Force Geneva, 3 8

9 3M CHANNEL ELTCTL RESULTS Limit Limit 4 pair INT VNA 4 pair 36 INT VNA Limit pair 54 INT VNA 45 4 Limit pair 78 INT VNA Brillhart 8.3bq NGBT Task Force Geneva, 3 9

10 3M CHANNEL ELTCTL ACCURACY VNA VNA 36 VNA 45 VNA Brillhart 8.3bq NGBT Task Force Geneva, 3

11 PL MEASUREMENT SETUP All VNA measurements were taken using procedures based on 6 port characterisation. All results were converted to terminations. VNA Cables were calibrated using Ecal. Fixtures removed using a 6 port deemebbed approach. Calibration plane is at Samtec jack, hence results include Salsa Plug. Brillhart 8.3bq NGBT Task Force Geneva, 3

12 PL MEASUREMENT SETUP Channel limit lines used to give reference to a limit. No PL balance limits in Draft.7 568C. This limit is not a proposal for PL limit. It is only used for comparison to channel accuracy. Link lengths 3m, 6m and 9m RJ45 C6A construction. Brillhart 8.3bq NGBT Task Force Geneva, 3

13 3M PL TCL RESULTS Mag. INT VNA Mag. INT VNA Mag. INT VNA Mag. INT VNA Brillhart 8.3bq NGBT Task Force Geneva, 3 3

14 3M PL TCL ACCURACY VNA VNA 36 VNA 45 VNA Brillhart 8.3bq NGBT Task Force Geneva, 3 4

15 3M PL ELTCTL RESULTS ' INT VNA '36 INT VNA ' '78 INT VNA 45 4 INT VNA Brillhart 8.3bq NGBT Task Force Geneva, 3 5

16 3M CHANNEL PL ACCURACY VNA VNA 36 VNA 45 VNA Brillhart 8.3bq NGBT Task Force Geneva, 3 6

17 TCL IMPROVEMENT FOR C6A LIMITS TCL Improvement When using C6A vs C8 Limits (Pair ) TCL Accuracy@Limit Improvement When using C6A vs C8 Limits (Pair 36).5.5 Diff Diff TCL Accuracy@Limit Improvement When using C6A vs C8 Limits (Pair 45) TCL Accuracy@Limit Improvement When using C6A vs C8 Limits (Pair 78) Dif 45.5 Diff Data shown was produced using 3m Channel Results. Brillhart 8.3bq NGBT Task Force Geneva, 3 7

18 ELTCTL IMPROVEMENT FOR C6A LIMITS ELTCTL Improvement When using C6A vs C8 Limits (Pair ) ELTCTL Accuracy@Limit Improvement When using C6A vs C8 Limits (Pair 36).5.5 Diff Diff ELTCTL Accuracy@Limit Improvement When using C6A vs C8 Limits (Pair 45) ELTCTL Accuracy@Limit Improvement When using C6A vs C8 Limits (Pair 78) Dif 45.5 Diff Brillhart 8.3bq NGBT Task Force Geneva, 3 8

19 OTHER BALANCE TESTS Although the TIA568 series of documents only specifies TCL and ELTCTL, other mixed mode measurements are possible using field testers. These include: RLcc (Common Mode Return Loss) NEXTcd (Intermodal NEXT) ELFEXTcd (Intermodal ELFEXT) Brillhart 8.3bq NGBT Task Force Geneva, 3 9

20 CONCLUSIONS Currently specified channel balance requirements can be measured in the field. Balance measurements can be performed on Permanent links and channels. (PL measurements produce better accuracies.) Accuracy improves significantly, when calculated at the limit for the cable under test (C6A) vs C8 limits. Additional balance properties not currently specified by the TIA 568 Series could also be tested in the field. Brillhart 8.3bq NGBT Task Force Geneva, 3

21 THANK YOU Brillhart 8.3bq NGBT Task Force Geneva, 3

22 ADDITIONAL RESULTS FOR 6M AND 9M CONFIGURATIONS Available from the authors upon request. Brillhart 8.3bq NGBT Task Force Geneva, 3