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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
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
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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
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
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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
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
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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
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
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Horizontal Balanced Cabling Models
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
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
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
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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
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
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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
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
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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
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
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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
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
Class I/II PSANEXT Performance
40
50
60
70
80
90
100
1 10 100 1000 10000Frequency (MHz)
dB
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Class FClass FAA
Class EClass EAA
Class IIClass IIClass IClass I
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
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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
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
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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
ignored due to screening
ignored due to screening
CF = variable
CR = variable
10GBASE10GBASE--TTSuppressionSuppression
Case 1:Fixed Assumptions
CN = 40dB
CF = 25dB
CR = 55dB
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
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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
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
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Class I/II Capacity Assessment
reduce CN + CF for same margin as Class I
CN = 20dB lessCF = 20dB less
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
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)
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
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%
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
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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
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH
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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!
Contribution to IEEE 802.3bq Task Force; 16-18 July 2013, Geneva, CH