Tài liệu Cabling Standard - TSB-155 - IEEE 802.3an for Cat 6A 10GBase-T System - Draft 4.0 pdf

A.9.2 Computing the power sum ANEXT loss and power sum AELFEXT ...26... WA Horizontal cabling...C optional consolidation Patch cord or jumper cable ...D point connector ...CP Telecommuni

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A.9.2 Computing the power sum ANEXT loss and power sum AELFEXT 26

Power sum alien near-end crosstalk loss: A computation of the unwanted signal coupling

Work area cord A Telecommunications outlet/

Optional transition cabling B connector WA

Horizontal cabling C optional consolidation

Patch cord or jumper cable D point connector CP

Telecommunications room Horizontal cross-connect or

equipment cord E interconnect C1, C2

Channel under test

Test equipment cord F Telecommunications outlet/

Optional transition cabling B connector……… WA

Horizontal cabling C Consolidation point connector………

CP

Horizontal cross-connect or Interconnect……… C1

Permanent link under test

differential ANEXT loss values over the frequency range 1 MHz to 500 MHz as follows in

f ANEXT f

PSANEXT

1

4 1

,

10

) ( 10

log 10 ) ( (dB) (1)

)100log(

151

1001

)100log(

101

f X

f dB

f X

) ( )

avg

f PSANEXT f

)100log(

15)25.21(

1001

)100log(

10)25.21()(

≤

<

−+

≤

≤

−+

≥

f dB

f X

f dB f X

f PSANEXT avg (4)

15)250 6250

6(62

f f

m L IL

100

)(

N

f AELFEXT f

PSAELFEXT

1

4 1

, ,

10

)(10

log10)

N N

j i cl N

j i

gthIL Coupledlen

L DisturbedI f

AELFEXT f

AELFEXT

, , ,

, ,

)(

j i N

min(

) ( f i,j,N DisturbedI LN Disturbing ILi,jgthIL

X PSAELFEXT dB (11)

Table 3– Calculated power sum AELFEXT constants

1

2

Channel Length PSAELFEXT constant (X2) (dB) at 250 MHz (dB) Insertion loss

f PSAELFEXT f

≥

100log2042)

(dB)

Insertion loss

at 250 MHz (dB)

power sum AELFEXT due the reduction in crosstalk coupling for lengths less than 100 meters

.2

250 6250

69

.37

tan

L MHz

IL MCat MHz

IL Cat

33

5 1

0003 0 204 0 0173 0 924

.

f f f

oss InsertionL Channel ≤ + ⋅ + + ⋅ dB (15)

f f

Table 5– Channel insertion loss

1

2

Frequency (MHz)

Insertion loss (dB)

1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0

2.1 4.0 5.7 6.3 8.0 9.0 10.1 11.4 16.5 21.3 31.5 35.9 39.8 46.9 53.4

9

10

)18(500330

)330/log(

5031

)17(3301

20

)100/log(

205410220

)100/log(

153.4410log20

f

f dB

f f

Table 6– Channel NEXT loss, worst pair-to-pair

1

2

Frequency (MHz)

NEXT loss (dB)

1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0

65.0 63.0 58.2 56.6 53.2 51.6 50.0 48.4 43.4 39.9 34.8 33.1 31.7 26.8 22.0

7.2.2 Power sum NEXT loss

10 log(

21

)21(500330

)330/log(

4228

)20(3301

20

)100/log(

205010220

)100/log(

153.4210log20

f

f dB

f f

PSNEXT channel

22

23

24

Table 7– Channel power sum NEXT loss

1

2

Frequency (MHz)

PSNEXT loss (dB)

1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0

62.0 60.5 55.6 54.0 50.6 49.0 47.3 45.7 40.6 37.1 31.9 30.2 28.8 24.5 20.4

7.3 ELFEXT and FEXT loss

201.4310420

)100/log(

208.2710log20

f f

Table 8– Channel ELFEXT, worst pair-to-pair

1

2

Frequency (MHz)

ELFEXT (dB)

1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0

63.3 51.2 45.2 43.3 39.2 37.2 35.3 33.4 27.3 23.3 17.2 15.3 13.7 11.2 9.3

7.3.2 Power sum ELFEXT

10 log(

201.4010420

)100/log(

208.2410log20

f f

channel PSELFEXT dB (24)

Table 9– Channel power sum ELFEXT

1

2

Frequency (MHz)

PSELFEXT (dB)

1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0

60.3 48.2 42.2 40.3 36.2 34.2 32.3 30.4 24.3 20.3 14.2 12.3 10.7 8.2 6.3

Table 10– Channel return loss equations

8

9

Frequency (MHz)

Return loss (dB)

Table 11– Channel return loss

1

2

Frequency (MHz)

Return loss (dB)

1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0

19.0 19.0 19.0 19.0 18.0 17.5 17.0 16.5 14.0 12.0 9.0 8.0 7.2

24

25

5 1

00015 0 18 0 0153 0 687

.

f f f

oss InsertionL PL ≤ + ⋅ + + ⋅ dB (25)

26

Table 12– Permanent link insertion loss

1

2

Frequency (MHz)

Insertion loss (dB)

1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0

1.9 3.5 5.0 5.5 7.0 7.9 8.9 10.0 14.4 18.6 27.4 31.1 34.6 41.1 47.1

)27(500300

)300/log(

4834

)26(3301

20

)100/log(

20541020

)100/log(

153.4410log20

f

f dB

f f

Table 13– Permanent link NEXT loss, worst pair-to pair

1

2

Frequency (MHz) NEXT loss (dB)

1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0

65.0 64.1 59.4 57.8 54.6 53.1 51.5 50.0 45.1 41.8 36.9 35.3 34.0 30.0 25.3

11

)29(500300

)300/log(

404.31

)28(3001

20

)100/log(

20501020

)100/log(

153.4210log20

f

f dB

f f

Table 14– Permanent link power sum NEXT loss

1

2

Frequency (MHz)

PSNEXT loss (dB)

1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0

62.0 61.8 57.0 55.5 52.2 50.7 49.1 47.5 42.7 39.3 34.3 32.7 31.4 28.1 24.2

8.3 Permanent link pair-to-pair ELFEXT

3

For all frequencies from 1 MHz to 250 MHz, the category 6 permanent link ELFEXT meets the

values determined using equation (30) as specified in TIA/EIA-568-B.2-1 For all frequencies

from 250 MHz to 500 MHz the category 6 permanent link ELFEXT of the permanent link should

meet the values determined using equation (30) The values in table 15 are provided for

201.4310320

)100/log(

208.2710log20

f f

ELFEXT (dB)

1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0

64.2 52.1 46.1 44.2 40.1 38.2 36.2 34.3 28.3 24.2 18.2 16.2 14.6 12.1 10.2

8.3.2 Permanent link power sum ELFEXT

1

For all frequencies from 1 MHz to 250 MHz, the category 6 permanent link power sum ELFEXT meets the values determined using equation (31) as specified in TIA/EIA-568-B.2-1 For all frequencies from 250 MHz to 500 MHz the category 6 permanent link power sum ELFEXT should meet the values determined using equation (31) The values in table 16 are provided for information only

201.4010320

)100/log(

208.2410log20

f f

PL PSELFEXT dB (31)

PSELFEXT (dB)

1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0

61.2 49.1 43.1 41.2 37.1 35.2 33.2 31.3 25.3 21.2 15.2 13.2 11.6 9.1 7.2

8.4 Permanent link return loss

6

For all frequencies from 1 MHz to 250 MHz, the category 6 permanent link return loss meets the values determined using the equations in table 17 as specified in TIA/EIA-568-B.2-1 table 31 For all frequencies from 250 MHz to 500 MHz the category 6 permanent link return loss should meet the values determined using the equations in Table 17 The values in table 18 are provided for information only

Return loss (dB)

1 ≤ f < 3 3≤ f <10 10≤ f < 40 40≤ f ≤250 250<f < 396

396 ≤ f ≤ 500

21+4log10(f/3)

21 26-5log10(f) 34-10log10(f) 10-20log(f/250)

6

10

Table 18– Permanent link return loss

1

2

Frequency (MHz)

Return loss (dB)

1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0

19.1 21.0 21.0 21.0 20.0 19.5 19.0 18.5 16.0 14.0 11.0 10.0 8.4 6.0 6.0

0 2 5 t_Floor

Co-located Connectors

Work Areas

2095,95

loor asurementF

Plug with 100 Ω differential and 50 Ω common mode terminations

25 Ω ± 1 %

50 Ω ± 0.1 %

Termination of plug Plug with 100 Ω differential and 50 Ω

common mode terminations

Test unit A

Remote unit

Plug with 100 Ω differential and 50 Ω common mode terminations

Test unit B

The test unit A is connected to the disturbed channel, and the test unit B is connected to a

Plug with 100 Ω differential and 50 Ω common mode terminations

Plug with 100 Ω differential and 50 Ω common mode terminations

Disturbed channel

Disturber channel

A.9 Processing measurement data

10log(

10)

, 1 , =− − PPANEXT N + − PPANEXT N + − PPANEXT N +

N i

f PSANEXT

⋅

− +

- Coupledlen gthIL(f)1,1,N is determined using equation (A-6) as the minimum of the

1010

log(

10)

, 1 , =− − PPAELFEXT N + − PPAELFEXT N + − PPAELFEXT N +

N i

f PSAELFEXT

9

)10

PSAELFEXT 0.1

10 N 1, PSAELFEXT 0.1

10log(10

⋅

− +

⋅

=

Npp

Nps 4 log 10 f dB Nps, floor,4 PSAXtalk f

dB Npp, floor,

0 10 i PSANEXT 1

0 10

log

10

i rected PSANEXTcor

0 10 i PSAFEXT 1

0 10

log

10

i rected PSAFEXTcor

1

)_

min_

_min_

_bof PBO disturbing link PBO disturbed link

j boffN

bof IL f

pr AN

f PSANEXT

1

4 1

,

10

)_)

(_(10log

10)

j boffN

bof IL f

pr AF

f PSAFEXT

1

4 1

, ,

10

)_)

(_(10log

10)

−

+ +

−

−

) ( _ 10 10

5 2 ) ( _ 10 log 10 10

) ( 10

10 ) ( 10

log 10 )

(

f ipl AF f

ipl AN f

PSAFEXT f

PSANEXT f

XW

boffN boffN

500 100

) 100 log(

15 _

100 1

) 100 log(

10 )

( _

f PSANEXT

f dB

f PSANEXT

f ipl

AN

t cons

t cons

log 20 ) (

) (

)(int)

f erval freq

XW f

2

)()

()

int _ f Xw f Xw f highfreque ncy lowfrequen cy

XW N freq erval =⎜⎛ N highfreq + N lowfreq ⎟⎞× − (C-10)

3 ,

2 ,

−

) ( 10

10

) ( 10

log 10 )

(

f PSAFEXT f

PSANEXT f

XX

boffN boffN

f XX f

Step 10 Determine the average margin using equation (C-14)

− +

−

) ( _ 10 10

) ( _ 10 log 10 )

(

f avgl AF f

avgl AN XX

)100log(

15)5.3(

1001

)100log(

10)5.3(

)(_

≤

≤

−+

=

f dB

f PSANEXT

f dB

f PSANEXT

f avgl

AN

t cons

t cons

) ( ) 100 log(

20 ) 4 tan (

) ( _avgl f PSAELFEXTc o ns t f IL f dB f MHz

400 10

= f avg

df f XA

) (

avg

f XA

1

)(

2

)()

()

(