40G is coming!
What is fact – what is Hype?
Status Quo in Standardization
Gerd Backhaus
Marketing Manager D-A-CH
Nexans Cabling Solutions
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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?
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Standardization committees
(examples)
IEEE 802.3an
10GBase-T
ISO/IEC 11801
Cat.5, 6, 6A, 7 + 7A
Class D-E-EA-F-FA
TIA 568.C.2
Cat.5, 6, 6A
Cenelec EN50173
Cat.5, 6, 6A, 7 + 7A
Class D-E-EA-F-FA
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10G Cu.-Cabling requirements
for 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;
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;
Category 7 components provide Class F
balanced cabling performance;
Category 7A components provide Class FA
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:
Cat.6A
U/UTP makes a complex (expensive)
2-C link, 6&1 chip-architecture
bundle, length 50m/each,necesarry!
tight bundle, no patch cords
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DC Cabling
TOR vs. EOR
• 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
• 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)
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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
IEEE802.3bq Working Group

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
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40GBase-T challenges…
Lower
coding
complexity
Higher
frequencies
Higher
attenuation
Shorter
Reach
Energy
costs
Higher
coding
complexity
Rel. lower
frequencies
Lower
attenuation
Longer
Reach
Complex
chip design/
costs
Cabling
related!
13
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Which cabling system will
support 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
TIA Cat 8
-> positive ACR up to 800 MHz
• 7Cat
7A/CH II Positive ACR
up toACR
2000Mhz
Cat
A enhancend/CHII/8.2
-> positive
up to 2000MHz
20
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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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Comparison: Classes/Categories
TIA vs ISO/IEC
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
Class II
Cat 8.2
(no couterpart)
Class II
*Category 8.1 and TIA Cat.8 are
NOT backward compatible to Class FA
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Comparison of different proposals
TIA vs ISO/IEC
Parameter
(at 1GHz in dB)
TIA Cat 8
ISO Class I ISO Class II
Difference
(GG45…Tera) TIA Cat 8 vs Cl II
(RJ45)
(RJ45)
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
ISO is equal or more performant then TIA in Class I already
And looking at Class II….this is a much higher league!
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Which
connector will make the
running?
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POSSIBLE CONNECTORS FOR 40G
Three different variants:
1.) RJ45 (enhanced) – IEC 60603-7-81
2.) Tera (enhanced) – IEC 61076-3-104, Ed.3
3.) GG45 (enhanced) – IEC 60603-7-82
(Panduit)
IEC 60603-7-82 is supported by:
• Belstewart (ARJ45)
• Panduit
(S-RJ45)
• Nexans
(GG45)
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GG45™ - functionallity
Eight RJ45 pins
100% Class D/E/EA
backward compatible
Four additional
GG45™ highspeed pins
for Class F/ FA
GG45™ Interface
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Components for 40G ?
connector:
• IEC60603-71
cable:
• Cat.7A S/FTP cable
• 1000/1200/1600 MHz
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Migration path with GG45
today:
Equipment requires
RJ45 connections
= Cat.7A cable with GG45 jacks
= Cat.5, 6 or 6A patch cords with RJ45
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Migration path with GG45
In future:
New 40G hardware
...connected with GG45 cords
= Cat.7A cable with GG45 jacks
= Cat.7A patch cords with GG45 plugs
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I. Concluding considerations to 40G
IEEE probably will make decision for 40GBase-t this year
ISO 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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II. Concluding considerations to 40G

…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!
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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
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