Cabling for 10GBASE-T and Beyond - A Tangled Web

Transcription

1 Augmented Category 6 Category 6 A CLC TR TIA/EIA-TSB-155 TIA/EIA-568-B.2-10 ISO/IEC A1.1 Class E A Class F A ISO/IEC A1.2 Category 7 A ISO/IEC TR ISO/IEC Cabling for 10GBASE-T - A Tangled Web The impact of pre-standard products on the supply industry

2 Mike Gilmore Standards Activities Member: JTC1 SC25 WG3: Generic Cabling Convenor: WG3 CITG: Cabling Implementation Convenor: WG3 IPTG: Industrial Premises (Cabling) Convenor: TC215 WG1: IT Cabling Secretary: TC215 WG2 Mike Gilmore Managing Director e-ready Building Chairman TCT7: Telecommunications - Installation Requirements Chairman TCT7/-/1: Infrastructure design, planning and commissioning TCT7/-/3: Infrastructure standards - UK implementation panel FIA Technical and Standards Director Fibreoptic Industry Association Director Telecommunications Infrastructure Advisory Board Mobile: +44 (0) mike.gilmore@btinternet.com

3 Cabling Categories and Classes Component ANSI TIA/EIA Link/channel Component ISO/IEC CLC BSI Link/channel Class A Class B Category 3 Category 5e Category 6 Category 3 Category 5e Category 6 Performance Category 5 Category 6 Category 7 Class C Class D Class E Class F Frequency Frequency Frequency Frequency

4 Application Support ANSI TIA/EIA Link/channel ISO/IEC CLC BSI Link/channel Category 5e Class D 1000BASE-T Gigabit Ethernet

5 Famous Quotes Customers The cheque s in the post Alan Hansen You ll win nothing with kids Mike Gilmore Never trust an even numbered Category Mike Gilmore There ll never be an application that only operates over Category 6 cabling

6 UCISA - Q1, 2006 Dissenting Voices. Category 6 may be a better investment than Category 5e for new-build installations. In its lifetime the cabling will probably support several generations of equipment. The capital cost is higher, but the long-term cost of ownership may well be lower than Category 5e. Cabling suppliers You ve already got Category 5 Buy Category 6 now!

7 10GBASE-T: IEEE 802.3an IEEE 802.3an: Link segment transmission parameters A link segment consisting of up to 100 m of Class E that meets the transmission parameters of this subclause provides a reliable medium nominal impedance delay parameters The transmission parameters of the link segment include insertion loss ELFEXT NEXT loss (NEXT) MDNEXT loss (PSNEXT) return loss extended to 500 MHz by extrapolating the formulas with appropriate adjustments for length when applicable as specified in: ISO/IEC TR-24750; TIA/EIA TSB-155; EN extended to 500 MHz by utilizing the equations referenced in: ISO/IEC TR-24750; TIA/EIA TSB-155; EN Requirements for the alien crosstalk (AXT) coupled between link segments: ISO/IEC TR-24750, TIA/EIA TSB-155, EN A link segment consisting of up to 100 m of Class F

8 10GBASE-T: IEEE 802.3an IEEE 802.3an:2006 Supported link segment distances 55 m 100 m Link segment transmission parameters Cabling Class E unscreened Category 6 unscreened Class E screened Category 6 screened Cabling reference ISO/IEC TR 24750, EN TIA/EIA TSB-155 ISO/IEC TR 24750, EN TIA/EIA TSB-155 Class F ISO/IEC 11801

9 10GBASE-T Technical Reports TIA/EIA TSB-155 ISO/IEC TR Guidelines for the assessment and mitigation of installed Category 6 cabling to support 10GBASE-T Information technology - Assessment and mitigation of installed balanced cabling channels in order to support IEEE GBASE-T CLC TR Cabling guidelines in support of IEEE GBASE-T Based on ISO/IEC but with improved text re-mitigation (taken from both other TRs) BSI PD CLC TR Cabling guidelines in support of IEEE GBASE-T

10 10GBASE-T Technical Reports TR Cabling intended for the validation of installed cabling re-verification of performance to 500MHz determination of AXT PSANEXT and PSAACR-F intended for the validation of installed CHANNELS AXT failures dealt with by relaxed limits based on insertion loss and length trade-offs between PSANEXT and PSAACR-F based on measured results for an installed channel mitigation techniques NOT intended for the the specification of new material

11 70 10GBASE-T PSANEXT Attenuation dependent parameter 4-pair average shall be 2.5 db higher than limits shown IL = 35.9 db = ~100 m X1 = 62 db db IL = 20.3 db = ~55 m X1 = 47 db IL 6.3 db X1 = 33.5 db Frequency (MHz)

12 10GBASE-T PSAELFEXT Attenuation and length dependent parameter 4-pair average shall be 4 db higher than limits shown db IL = 35.9 db = ~100 m X2 = 37.9 db IL = 20.3 db = ~55 m X2 = 33.7 db IL 10 db X2 = 32.5 db Frequency (MHz)

13 AXT Testing

14 Mitigation Techniques the number of connections involving connecting hardware with high coupling; including screened connectors that are not individually screened; screened connecting hardware with poor transfer impedance; the performance, length and dressing of equipment cords. PROCESSES TO IMPROVE SPECIFIC ANEXT FAILURES Unbundle and randomise cords SOURCES OF SPECIFIC ANEXT FAILURES Increase the distance between cords at each location Utilise cords sufficiently specified to mitigate the AXT coupling Reduce the number of connections in the channel Increase separation distance between interfaces at each location Utilise longer cords (within channel limits) Unbundle and randomise the installed cables at appropriate ends SOURCES OF SPECIFIC AACR-F FAILURES as above plus the performance, length and dressing of the entire channel; the mixture of short and long channels. PROCESSES TO IMPROVE SPECIFIC AACR-F FAILURES As above plus Segregate long and short channels

15 70 60 Class E Channel Class E Chnl RL Class E Chnl ll Class E Chnl NEXT Class E Chnl PSNEXT Class E Chnl ELFEXT Class E Chnl PSELFEXT NEXT, PSNEXT informative for IL < 4.0 db ACR (i.e. NEXT- IL), PSACR normative db RL informative for IL < 3.0 db Parameters not shown ACR PSACR DC loop resistance Resistance unbalance Operating voltage Current capacity Power capacity 1 Coupling attenuation Unbalance attenuation Delay Delay skew Frequency (MHz) / f ns (max) 50 ns (max) 1 Not present in EN standards

16 70 10GBASE-T Cabling 10GBASE-T Chnl RL 10GBASE-T Chnl ll 10GBASE-T Chnl NEXT 10GBASE-T Chnl PSNEXT 10GBASE-T Chnl ELFEXT 10GBASE-T Chnl PSELFEXT Parameters not shown PSANEXT PSAELFEXT db Frequency (MHz) Delay (2-500 MHz) 580 ns Delay skew (all f) 50 ns (max)

17 70 60 Class F Channel Class F Chnl RL Class F Chnl ll Class F Chnl NEXT Class F Chnl PSNEXT Class F Chnl ELFEXT Class F Chnl PSELFEXT NEXT, PSNEXT informative for IL < 4.0 db ACR (i.e. NEXT- IL), PSACR normative db RL informative for IL < 3.0 db Parameters not shown ACR PSACR DC loop resistance Resistance unbalance Operating voltage Current capacity Power capacity 1 Coupling attenuation Unbalance attenuation Delay Delay skew Frequency (MHz) / f ns (max) 50 ns (max) 1 Not present in EN standards

18 The Hierarchical Principle Component ANSI TIA/EIA Link/channel Component ISO/IEC CLC BSI Link/channel Class A Class B Category 3 Category 5e Category 6 Aug. Cat. 6 Category 3 Category 5e Category 6 Aug. Cat. 6 Performance Category 5 Category 6 Category 6 A Category 7 Class C Class D Class E Class E A Class F Category 7 A Class F A Frequency Frequency Frequency Frequency

19 New Performance Standards ISO/IEC ISO/IEC Ed.2 A Ed.2 A1.2 Information technology: Generic cabling for customer premises Class E A and Class F A channels Amendments to channel Classes D, E and F Deadline: 02/08 Information technology: Generic cabling for customer premises Class E A and Class F A links Amendments to link Classes D, E and F Category 6 A and Category 7 A components Amendments to component Cats 5, 6 and 7 ~ 12/08 ANSI TIA/EIA -568-B -568-B.2 Addendum 10 Commercial Building Telecommunications Cabling Standard Balanced Cabling Transmission performance specifications for 4-pair 100 Ω Augmented Category 6 cabling Deadline: Q1, 08

20 Comparisons CHANNELS Class E A is more stringent than Augmented Category 6 NEXT PSNEXT ACR-F PSACR-F CABLES Augmented Category 6 = Category 6 A CONNECTIONS Class E A is more stringent than Augmented Category 6 NEXT PSNEXT PERMANENT LINKS Class E A is more stringent than Augmented Category 6 Augmented Category 6 is more stringent than Class E A NEXT PSNEXT RL PSAACR-F

21 Cable Constructions ISO/IEC 11801: 2002 ACRONYM X X / X X X CLC TR : 2008 A.1 OVERALL SCREEN U = Unscreened F = Foil screened S = Braid screened SF = Braid and foil screened CABLE ELEMENT TP = Twisted pair Q = Quad ELEMENT SCREEN U = Unscreened F = Foil screened U/UTP Typical CA: Type I Typical CA: Type II U/FTP S/FTP Typical CA: Type III F/UTP Typical CA: Type II Typical CA: Type III SF/UTP

22 Conclusions Mike Gilmore Never trust an even numbered Category Mike Gilmore There ll never be an application that only operates over Category 6 cabling. Category 6 may be a better investment than Category 5e for new-build installations.? UCISA - Q1, 2006 In its lifetime the cabling will probably support several generations of equipment.? The capital cost is higher, but the long-term cost of ownership may well be lower than Category 5e.? Cabling suppliers You ve already got Category 6 Buy Augmented Category 6/Category 6 A now!

23 CLC TR Augmented Category 6 Category 6 A Class E A ISO/IEC A1.1 TIA/EIA-TSB-155 TIA/EIA-568-B.2-10 Class F A ISO/IEC A1.2 Category 7 A ISO/IEC TR ISO/IEC The End