pdf class i vs. class ii cabling - ieee 802 · class i vs. class ii cabling alan flatman principal...

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Class I vs. Class IIClass I vs. Class IICablingCabling

Alan FlatmanAlan FlatmanPrincipal ConsultantPrincipal ConsultantLAN TechnologiesLAN Technologies

Email: Email: [email protected][email protected]

Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH

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Content

1. Class I vs. Class II performance2. cable & connector construction3. relative costs for a 30m channel4. standardisation status & plans


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ISO/IEC TR 11801-99-140GBASE-T Cabling Guidance

speculative project approved March 2012 to support Next Gen. BASE-T initiatives underway within IEEEmotivation to offer range of optionsrange of options for 40GBASE-TTechnical Report route chosen to expedite processexpedite processPDTR had substantial support in 1st national review2nd PDTR circulated in April 2013 for approval as DTRISO/IEC 11801-99-1 expected to be approved 1Q14


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ISO/IEC TR 11801-99-1 Deliverables

Cat 6A Cat 7A

Perf

orm

ance

Req

uire

men

tsfo

r 30m

, 2-c

onne

ctor

Cha

nnel

Legacycomponents

Legacycomponents

Legacycomponents to

higher frequency

Enhancedcomponents to

higher frequency

Enhancedcomponents to

higher frequency

Tutorial on Channel Capacity,Assumptions, other PHY-related

Legacycomponents to

higher frequency


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ISO/IEC TR 11801-99-1 Next Generation CablingPe

rfor

man

ce R

equi

rem

ents

for 3

0m, 2

-con

nect

or C

hann

el

Legacy Cat 6AComponentsto 500 MHz

Legacy Cat 7AComponentsto 1000 MHz

Legacy Cat 7AComponentsto 1,600 MHz*

Class I Channel withCat 8.1 Components

to 1,600 MHz*

Class II Channel withCat 8.2 Components

to 1,600 MHz*

Tutorial on Channel Capacity,Assumptions, other PHY-related

Next GenerationCabling for 40G

* Upper Frequency of 2 GHz For Further Study


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Horizontal Balanced Cabling Models


Equipment C EquipmentC

FlexibleCord

= connection (mated pair)

CEquipment

FlexibleCord

C C EquipmentC

Channel (30m max)

Interconnect

EquipmentOutletFixed

CableFlexible

Cord

Channel (~10m max)

C

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Cable Construction

Typical Cat 8.1/Cat 8 Cable Typical Cat 8.2 Cable

Twisted pairs

Inner foil sheaths

Braid

Outer foil sheath F/UTP S/FTP

Note: ISO/IEC 11801 & IEC 61156 do not specify cable construction


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Connectors

IEC 60603-7-71GG45 has a switch

1,000 MHz Cat 7A

IEC 61076-3-110ARJ45 8-contacts

600 - 3,000 MHz Cat 7A & 8.2

IEC 60603-7RJ45 8-contacts

3 - 2,000 MHzCat 3 to 6A& 8.1

IEC 61076-3-104Tera 8-contacts600 - 2,000 MHz

Cat 7A & 8.2Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH

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Comparison of Class I & Class II Channels

RL

ISO/IEC 11801-99-1 2nd PDTRClass I Channel

ISO/IEC 11801-99-1 2nd PDTRClass II Channel

631<f<1000 36-10*log(f)1000<f<2000 6dB

631<f<1000 35-9*log(f)1000<f<2000 8dB

IL 0.32(1.8√f+0.005f+0.25/√f) + 2x0.02√f 0.32(1.8√f+0.005f+0.25/√f) + 2x0.02√f

TCL

ELTCTL

CA 30<f<100 50dB100<f<2000 90-20*log(f)

30<f<100 50dB100<f<2000 90-20*log(f)

PSANEXT 1<f<100 100-10*log(f)100<f<2000 110-15*log(f)

1<f<100 105-10*log(f)100<f<2000 115-15*log(f)

PSAACRF 56-20*log(f/100) 61-20*log(f/100)

1<f<79.5 38-20*log(f) 1<f<79.5 38-20*log(f)

1<f<1600 60-17*log(f)1600<f<2000 40dB max

1<f<1600 60-17*log(f)1600<f<2000 40dB max


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Comparison of Class I & Class II Channels

ISO/IEC 11801-99-1 2nd PDTRClass I Channel @ 1GHz

ISO/IEC 11801-99-1 2nd PDTRClass II Channel @ 1GHz

6.0dB 8.0dB

21.1dB 21.1dB

22.6dB 47.9dB

10.5dB 33.1dB

30.0dB

65.0dB 70.0dB

36.0dB 41.0dB

RL

IL

NEXT

ACR-F

CA

PSANEXT

PSAACRF

70.0dB

41.0dB

8.0dB

47.9dB

Perf

orm

ance

Adv

anta

ge H

ighl

ight

edPe

rfor

man

ce A

dvan

tage

Hig

hlig

hted

30.0dB

33.1dB


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Class I/II Channel RL Performance

6

8

10

12

14

16

18

20

1 10 100 1000 10000

dB

Frequency (MHz)

Class FClass FAAClass EClass EAA

Class IIClass II

Class IClass I


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0

10

20

30

40

50

60

70

80

1 10 100 1000 10000

NEXT(dB)

Class IIClass II

Class IClass I

Frequency (MHz)

Class FClass FAA

Class EClass EAA

Class I/II Channel IL & NEXT Performance

IL(dB) 100m

30m


Class I/II PSANEXT Performance

40

50

60

70

80

90

100

1 10 100 1000 10000Frequency (MHz)

dB

13

Class FClass FAA

Class EClass EAA

Class IIClass IIClass IClass I


20

30

40

50

60

70

80

90

100

1 10 100 1000 10000Frequency (MHz)

Class I/II PSAACR-F Performance

14

dB

Class FClass FAA

Class EClass EAA

Class IIClass IIClass IClass I


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Capacity Assessment

Case 1:Fixed Assumptions

CN = 40dB

Case 2:Variable Assumptions

CN = variable

CF = 25dB

CR = 55dB

BN = -150dBm/Hz

Tp = 3dBm

ignored due to screening

NEXT Noise Suppression

FEXT Noise Suppression

Echo Noise Suppression

Background Noise PSD

Transmit Signal Power

PSANEXT Noise

PSAACRF Noise ignored due to screening

BN = -150dBm/Hz

Tp = 3dBm



CF = variable

CR = variable

10GBASE10GBASE--TTSuppressionSuppression

Case 1:Fixed Assumptions

CN = 40dB

CF = 25dB

CR = 55dB


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Class I/II Capacity Assessment

Background noise level = Tp – BN – 10log(f) Margin to Capacity based on bliss_01_0912_NGBT


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Class I/II Capacity Assessment

reduce CN + CF for same margin as Class I

CN = 20dB lessCF = 20dB less


Cable Dimensions

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8 major cabling suppliers surveyed for cable ODssuppliers produce both F/UTP & S/FTP cablesLSZH solid conductor cable types considered

Cat 8.1 cable an enhanced version of Cat 6A F/UTPCat 6A F/UTP OD in range 6.8 - 7.4 mm (mean 7.1 mm)Cat 8.1 F/UTP OD 7.6mm (larsen_01a_1112_NGBT)

Cat 8.2 cable an enhanced version of Cat 7A S/FTPCat 7A S/FTP OD in range 7.2 - 7.8 mm (mean 7.5 mm)Cat 8.2 S/FTP OD 8.0mm (early products)


Relative Costs

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7 major cabling suppliers surveyed for component pricessuppliers produce UTP, F/UTP and S/FTP cablesLSZH cable types considered (no plenum types)average 2012 supplier volume EMEA selling prices

relative mean cost of 30m, 2-connector channel calculated as:2m cord + 26m cable + 2m cord

3 different Cat 7A connector types *

cost of enhancement of Cat 6A to Cat 8.1 & Cat 7A to Cat 8.2 considered to be similar

F/UTP S/FTP S/FTP

Cat 6A Cat 7A

100% 102% 104% - 136%*UTP

126%


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ISO/IEC TR 11801-99-1Plan for Completion & Next Steps

2nd PDTR circulated in April for approval as DTRISO/IEC 11801-99-1 planned to be published 1Q14definition of 30m, 2-connector channels underwayguide to be provided on use of cords as channelsnew Cats/Classes to be part of ISO/IEC 11801 Ed.3

will be influenced by preferences within 802.3bq


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Class I vs. Class II CablingSummary

Cable OD difference ~5% greater for Class II

Cable bulk difference ~10% greater for Class II

30m channel cost difference(components only) 4-36% greater for Class II

NEXT & FEXT cancellationfor same margin to capacity ~20dB less less for Class II

Cost & cable bulk are NOT major decision factorsCost & cable bulk are NOT major decision factors

Channel performance IS a major decision factor!Channel performance IS a major decision factor!


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Inspiration from booth_01_0513_40GBT


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