IEEE 802.3bp Alien crosstalk measurements
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1 IEEE 802.3bp Alien crosstalk measurements Thomas Müller, Stephan Kunz, Gunnar Armbrecht (Rosenberger) Supporters: Mehmet Tazebay (Broadcom) Sujan Pandey (NXP) Rainer Pöhmerer (Leoni) Martin Huber (MD Elektronik)
2 Channel measurements Outline Coupling between twisted pair cables Alien crosstalk measurement setup Measurement results Conclusion 2
3 Alien Crosstalk Coupling between twisted pair cables For well balanced cables, direct differential coupling is predominant over mode conversion related coupling (diff. -> com. com. -> diff.) Direct differential coupling between cables is mainly determined by distance and twist lengths per pair (e.g. CAT6 cables use different twist lengths per pair) twist length 1 cable 1 cable 2 distance twist length 2 3
4 Alien Crosstalk Four around one Measurement setup Four port VNA measurement setup Four around one configuration With 50 mm isolation material over conducting ground Measurement pair feed via single adapter boards to SMA Termination with multi- or single-port connectors Breakout-Boards floating against ground ISO 50 mm GND 4
5 Sdd21 [db] Alien Crosstalk Four around one Five meter cable without inline Typical FlexRay TM cable PSANEXT FLEXRAY a1 PSANEXT 2 x 0.35 qmm D = 4.0 mm 5 m PSANEXT DUT01 PSANEXT DUT02 PSANEXT DUT03 PSANEXT DUT04 PSANEXT DUT05 RT Proposal f [MHz] Typical jacketed FlexRay TM cables fail to meet the alien crosstalk baseline proposal 5
6 Sdd21 [db] Alien Crosstalk Four around one Five meter cable without inline Typical FlexRay TM cable PSAACR-F 0 FLEXRAY a1 PSAACR-F x 0.35 qmm D = 4.0 mm 5 m PSAACR-F DUT01 PSAACR-F DUT02 PSAACR-F DUT03 PSAACR-F DUT04 PSAACR-F DUT05 f [MHz] Typical jacketed FlexRay TM cables fail to meet the alien crosstalk baseline proposal 6
7 Alien Crosstalk Four around one Five meter cable without inline Standard RTPGE cable PSANEXT LEU-G a1 PSANEXT 2 x 0.14 qmm D = 3.2 mm 3 x 1.66 m PSANEXT DUT01 PSANEXT DUT02 PSANEXT DUT03 PSANEXT DUT04 PSANEXT DUT05 Standard RTPGE cables don t meet the alien crosstalk baseline proposal 7
8 Alien Crosstalk Four around one Five meter cable without inline Standard RTPGE cable PSAACR-F 0 LEU-G a1 PSAACR-F x 0.14 qmm D = 3.2 mm 3 x 1.66 m PSAACR-F DUT01 PSAACR-F DUT02 PSAACR-F DUT03 PSAACR-F DUT04 PSAACR-F DUT05 Standard RTPGE cables don t meet the alien crosstalk baseline proposal 8
9 Alien Crosstalk Four around one Five meter cable without inline Crosstalk-optimised RTPGE cable PSANEXT LEU-G a1 PSANEXT 2 x 0.14 qmm D = 3.2 mm 5 m PSANEXT DUT01 PSANEXT DUT02 PSANEXT DUT03 PSANEXT DUT04 PSANEXT DUT05 Crosstalk-optimised RTPGE cables provide ~10 db better performance, but still don t meet the baseline proposal 9
10 Alien Crosstalk Four around one Five meter cable without inline Crosstalk-optimised RTPGE cable PSAACR-F 0 LEU-G a1 PSAACR-F x 0.14 qmm D = 3.2 mm 5 m PSAACR-F DUT01 PSAACR-F DUT02 PSAACR-F DUT03 PSAACR-F DUT04 PSAACR-F DUT05 Crosstalk-optimised RTPGE cables provide ~10 db better performance, but still don t meet the baseline proposal 10
11 Sdd21 [db] Alien Crosstalk Four around one Five meter cable with two inline connectors Crosstalk-optimised MTD cable PSANEXT LEU-G20 3x1660 4a1 PSANEXT 2 x 0.14 qmm D = 3.2 mm 3 x 1.66 m PSANEXT DUT01 PSANEXT DUT02 PSANEXT DUT03 PSANEXT DUT04 PSANEXT DUT05 f [MHz] The influence of inline-connectors on alien crosstalk is low 11
12 Sdd21 [db] Alien Crosstalk Four around one Five meter cable with two inline connectors Crosstalk-optimised RTPGE cable PSAACR-F 0 LEU-G20 3x1660 4a1 PSAACR-F x 0.14 qmm D = 3.2 mm 3 x 1.66 m PSAACR-F DUT01 PSAACR-F DUT02 PSAACR-F DUT03 PSAACR-F DUT04 PSAACR-F DUT05 f [MHz] The influence of inline-connectors on alien crosstalk is low 12
13 Sdd21 [db] Alien Crosstalk Four around one 1.66 meter cable without inline connectors Crosstalk-optimised RTPGE cable PSANEXT LEU-G20 1x a1 PSANEXT 2 x 0.14 qmm D = 3.2 mm 1.66 m PSANEXT DUT01 PSANEXT DUT02 PSANEXT DUT03 PSANEXT DUT04 PSANEXT DUT05 f [MHz] The influence of cable length on PSAACR-F is larger than on PSANEXT 13
14 Sdd21 [db] Alien Crosstalk Four around one Five meter cable with two inline connectors Crosstalk-optimised MTD cable PSAACR-F 0 LEU-G20 1x a1 PSAACR-F x 0.14 qmm D = 3.2 mm 1.66 m PSAACR-F DUT01 PSAACR-F DUT02 PSAACR-F DUT03 PSAACR-F DUT04 PSAACR-F DUT05 f [MHz] The influence of cable length on PSAACR-F is larger than on PSANEXT 14
15 Alien Crosstalk Conclusion Alien crosstalk is mainly caused by differential than common mode crosstalk, which is highly depended on distance between cables Alien crosstalk between differential pairs can be improved by using different twist-lengths, as used in in structured wiring LAN cables, which is not an option for automotive Current cables are optimised for low attenuation and high balance while maintaining minimum size, weight and cost Increasing the distance between cables by increasing the jacket diameter will substantially increase space, weight, attenuation and cost Baseline proposal should not end up in a single source for cables Is this strict alien crosstalk limit really technically needed for reliable link operation? Request to change the baseline proposal for PSNEXT to more generally attainable values 15
16 Alien Crosstalk Backup Backup 16
17 Sdd21 [db] Sdd21 [db] Alien Crosstalk Baseline Proposal PSANEXT PSANEXT scenario to be verified Existing baseline log log f 100 f 100 [1 to 100 MHz] 6 ( f 100 ) [100 to 600 MHz] 400 Proposed baseline log log f 100 f 100 [1 to 100 MHz] 6 ( f 100 ) [100 to 600 MHz] 400 3x1660 4a1 PSANEXT 3x1660 4a1 PSANEXT PSANEXT DUT05 Existing baseline Proposed baseline f [MHz] PSANEXT DUT01 PSANEXT DUT02 PSANEXT DUT03 PSANEXT DUT04 PSANEXT DUT01 PSANEXT DUT02 PSANEXT DUT03 PSANEXT DUT04 PSANEXT DUT05 Existing baseline Proposed baseline f [MHz] 17
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