Date et page . 1Nexans Cabling Solutions

40G is coming!What is fact – what is Hype?Status Quo in Standardization

Gerd BackhausMarketing Manager D-A-CH

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Agenda

• Cabling in DCs

• Topology, requirements, trends

• Lessons learned from 10G• …40G over twisted pair!...how?

• Requirements/proposals from IEEE, ISO/IEC, TIA

• Which connector?

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40GBase-T…what‘s going on?

Cat 8?Cat 8.1?Cat 8.2?

Channel I ?Channel II ?1600 MHz?2000 MHz?

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IEEE 802.3an10GBase-T

ISO/IEC 11801Cat.5, 6, 6A, 7 + 7A

Class D-E-EA-F-FA

Cenelec EN50173Cat.5, 6, 6A, 7 + 7A

Class D-E-EA-F-FA

TIA 568.C.2Cat.5, 6, 6A

Standardization committees(examples)

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10G Cu.-Cabling requirementsfor data centers

ISO 24764

“6.2.2 Balanced cabling

The main distribution and zone distribution cabling shall be designed to provide a minimum of Class EA channel performance as specified in ISO/IEC 11801.”

Component Choice for Twisted Pair: Category 6A components provide Class EA

balanced cabling performance;

Category 7 components provide Class F balanced cabling performance;

Category 7A components provide Class FA

balanced cabling performance.

TIA-942

“ 7.3.4   Recognized media (for DCs)

· 4-pair 100-ohm balanced twisted-pair cable (ANSI/TIA-568-C.2) – category 6 or category 6A, with category 6A recommended”

Component Choice for Twisted Pair: Category 6A components provide

balanced cabling performance;

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UTP cabling requires Alien Xtalk Tests

Cat6A F/UTP Test Very good headroom

Cat6A U/UTP Test Close to the limits

Test configuration: 2-C link, 6&1 bundle, length 50m/each, tight bundle, no patch cordsCat.6A U/UTP makes a complex (expensive)

chip-architecture necesarry!

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DC CablingTOR vs. EOR

• Switch at the end of Row• Connection to Server via 2 Connector / 3

Connector Twisted Pair Cabling Channel (20-30m) • More Cabling , Fewer Switches• Benefits:

• Interoperability of Equipment by use of internationally standardised copper cabling

• Allows all topologies• Less expensive to Upgrade if correctly

designed• Disadvantages

• Amount of Cables (depend on Topology used)• Scalability (depends on cabling grade used)

• Switch in each Server Rack (or adjacent) connected via Fibre Uplinks

• Connection to Server via Fibre or Copper Patch Cord (1-2m) or very short CC Link (3m)

• Less Cabling, More Switches• Benefits:

• Scalable (with exchange of TOR switch) • Little Cabling (48 Fibres to a Rack)

• Disadvantage• Oversubscription• Upgrade Cost• Congestion when IntraRack traffic

TOREOR

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Another aspect…Required distances in DCs

In DCs shorter lengths are dominant>80% of the lengths are not longer then 30m

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Lessons learned from 10G

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Lessons learned from 10G

Lessons from 10G Lessons for 40G

100m reach not required Reduce reach to match market requirement <50m

UTP Cable spec – Noise Sensititivy took time to overcome

Shielded cable – ANEXT problem eliminated

High PHY power consumption – Required 3 generations of silicon

Reduce PHY power – less distance and less compensation : Positive ACR for increased frequency

Window of opportunity missed (6 years) – enabled TOR

Use current generation of silicon: reduces time to market

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IEEE expectations for 40G

Group Spirit best expressed by http://www.ieee802.org/3/bq/public/may13/booth_01_0513_40GBT

Former project manager for 10GBase-T Leader of AD-HOC Channel Modelling

IEEE802.3bq Working Group

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40GBase-T challenges…

1313

Higher coding

complexity

Rel. lower frequencie

s

Lower attenuatio

n

Longer Reach

Complex chip

design/costs

Cabling related!

Lower coding

complexity

Higher frequencie

s

Higher attenuatio

n

Shorter Reach

Energy costs

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Which cabling system willsupport 40G

and...Is TIA Cat8 better than

ISO Cat7A?

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TP components for 40G

TP Definition started in September 2012

4 pairs cable, not multilane High Density: 48 ports/HU Speed: 40G 2 connector link only No support of 100m distance -> 30m

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TIA Next gen / „US Cat.8“ACR for length of 30m

• Cat 8 Positive ACR up to 800 MHz• Cat 7A/CH II Positive ACR up to 2000Mhz

20

TIA Cat 8 -> positive ACR up to 800 MHzCat 7A enhancend/CHII/8.2 -> positive ACR up to 2000MHz

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BIG SURPRISE AT TIA MEETING,JUNE 2013:

During its meeting the week of June 17, the TIA TR-42.7 Copper Cabling Subcommittee “accepted the concept of adding ISO/IEC Class II cabling performance criteria” into its pending ANSI/TIA-568-C.2-1 category 8 project!!!

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ISO/IEC ISO/IEC Is similar to… TIA channel/

channel components components

Class E Cat 6 Cat 6

Class EA Cat 6A Cat 6A

Class I Cat 8.1* Cat 8*

Class FA Cat 7A (no couterpart)

Class II Cat 8.2 Class II

Comparison: Classes/CategoriesTIA vs ISO/IEC

*Category 8.1 and TIA Cat.8 are NOT backward compatible to Class FA

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Parameter TIA Cat 8 ISO Class I ISO Class II Difference

(at 1GHz in dB) (RJ45) (RJ45)(GG45…

Tera)TIA Cat 8 vs Cl

II

Return loss 8 8 8

Insertion Loss 22 22,5 21,1 0,9

PS-NEXT 16,5 16,6 44,9 28,4

PS-ACRF 9 9 30,1 21,1

PS-ANEXT 70 70 70

PS-AACRF 41 41 41

Comparison of different proposalsTIA vs ISO/IEC

ISO is equal or more performant then TIA in Class I alreadyAnd looking at Class II….this is a much higher league!

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Which connector will make the

running?

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Three different variants:

1.) RJ45 (enhanced) – IEC 60603-7-812.) Tera (enhanced) – IEC 61076-3-104, Ed.33.) GG45 (enhanced) – IEC 60603-7-82

IEC 60603-7-82 is supported by:

• Belstewart (ARJ45)

• Panduit (S-RJ45)

• Nexans (GG45)

(Panduit)

POSSIBLE CONNECTORS FOR 40G

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Eight RJ45 pins100% Class D/E/EA

backward compatible

Four additional GG45™ highspeed pins

for Class F/ FA

GG45™ Interface

GG45™ - functionallity

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Components for 40G ?

connector:• IEC60603-71

cable: • Cat.7A S/FTP cable• 1000/1200/1600 MHz

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= Cat.7A cable with GG45 jacks

= Cat.5, 6 or 6A patch cords with RJ45

10G

10G

today:Equipment requiresRJ45 connections

Migration path with GG45

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40G

40G

In future:New 40G hardware...connected with GG45 cords

= Cat.7A cable with GG45 jacks

= Cat.7A patch cords with GG45 plugs

Migration path with GG45

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I. Concluding considerations to 40G

IEEE probably will make decision for 40GBase-t this yearISO and TIA will follow later (2015?)

Design around length <30m

Copper cabling enables EEE savings

Todays Cat7A are often better then then required due to the standards

GG45 is tried and tested since years – and is the most elegant way for a 40G migration

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…extended drive distances…more than 30m?

…let‘s see what the industry will offer in the future

Will Channel II/Cat 8.2 support 100m for 10G …of course!

II. Concluding considerations to 40G

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Test set up

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Further Informations:

Please find our white papers and other info here:

www.nexans.co.uk/lansystems

Gerd.Backhaus@nexans.com

Thanks for listening?Questions???

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Workshop

http://www.youtube.com/watch?v=GT9Af7W5IPI

http://www.youtube.com/watch?v=up636JoRF4k