ISO/IEC 11801:2002/Amd 1:2008
(Amendment)Information technology — Generic cabling for customer premises — Amendment 1
Information technology — Generic cabling for customer premises — Amendment 1
Technologies de l'information — Câblage générique des locaux d'utilisateurs — Amendement 1
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Standards Content (Sample)
ISO/IEC 11801
Edition 2.0 2008-04
INTERNATIONAL
STANDARD
AMENDMENT 1
Information technology –
Generic cabling for customer premises
ISO/IEC 11801 A1:2008(E)
---------------------- Page: 1 ----------------------
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ISO/IEC 11801
Edition 2.0 2008-04
INTERNATIONAL
STANDARD
AMENDMENT 1
Information technology –
Generic cabling for customer premises
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
P
ICS 35.200 ISBN 2-8318-9715-7
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– 2 – 11801 Amend. 1 © ISO/IEC:2008(E)
FOREWORD
Amendment 1 to International Standard ISO/IEC 11801:2002 was prepared by
subcommittee 25: Interconnection of information technology equipment, of ISO/IEC joint
technical committee 1: Information technology.
This International Standard has been approved by vote of the member bodies, and the voting
results may be obtained from the address given on the second title page.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
__________
---------------------- Page: 4 ----------------------
11801 Amend. 1 © ISO/IEC 2008(E) – 3 –
INTRODUCTION to Amendment 1
This amendment provides requirements for new Class E and F channels plus additions and
A A
corrections to ISO/IEC 11801:2002. Amendment 2 of ISO/IEC 11801:2002 will provide
balanced cabling models, requirements and normative references for Category 6 and 7
A A
components, requirements for Class E and F links, together with amendments to the
A A
requirements for optical fibre cabling.
Update references to Tables, the numbers of which have been changed.
---------------------- Page: 5 ----------------------
– 4 – 11801 Amend. 1 © ISO/IEC:2008(E)
Page 6
Replace, in the list of figures, the title of Figure 10 by the following new title:
Figure 10 – Balanced cabling: channel, permanent link and CP link.
Page 13
2 Normative references
Replace, on page 14 to 17, the following references by the updated references as indicated
below:
IEC 60512-25-5, Connectors for electronic equipment – Basic tests and measurements – Part
1
25-5: Test 25e – Return loss
IEC/PAS 60793-1-49:2002, Optical fibres – Part 1-49: Measurement methods and test
procedures – Differential mode delay
2
IEC 60794-2:1989, Optical fibre cables – Part 2: Product specification (indoor cable)
Amendment 1 (1998)
IEC/PAS 61076-3-104:2002, Connectors for electronic equipment – Part 3-104: Detail
specification for 8-way, shielded free and fixed connectors, for data transmissions with
frequencies up to 600 MHz
IEC 61935-1:2000, Generic cabling systems – Specifications for the testing of balanced
communication cabling in accordance with ISO/IEC 11801 – Part 1: Installed cabling
Amendment 1 (under consideration)
IEC 61935-2, Generic cabling systems – Specification for the testing of balanced
communication cabling in accordance with ISO/IEC 11801 – Part 2: Patch cords and work
1)
area cords
ISO/IEC TR 14763-1, Information technology – Implementation and operation of customer
premises cabling – Part 1: Administration
ISO/IEC 18010:2002, Information technology – Pathways and spaces for customer premises
cabling
Updated references:
IEC 60512-25-5, Connectors for electronic equipment – Tests and measurements – Part 25-5:
Test 25e – Return loss
1
To be published.
2
There exists a consolidated Edition 4.1 (1998) of IEC 60794-2 that includes Edition 4.0 (1989) and its
amendment 1 (1998).
---------------------- Page: 6 ----------------------
11801 Amend. 1 © ISO/IEC 2008(E) – 5 –
IEC 60793-1-49, Optical fibres – Part 1-49: Measurement methods and test procedures –
Differential mode delay
IEC 60794-2, Optical fibre cables – Part 2: Indoor cables – Sectional specification
IEC 61076-3-104, Connectors for electronic equipment – Product requirements – Part 3-104:
Detail specification for 8-way, shielded free and fixed connectors for data transmissions with
3
frequencies up to 600 MHz minimum
IEC 61935-1, Testing of balanced communication cabling in accordance with ISO/IEC 11801 –
Part 1: Installed cabling)
IEC 61935-2, Testing of balanced communication cabling in accordance with ISO/IEC 11801 –
Part 2: Patch cords and work area cords
ISO/IEC 14763-1, Information technology – Implementation and operation of customer
premises cabling – Part 1: Administration
ISO/IEC 18010, Information technology – Pathways and spaces for customer premises
cabling
Page 17
3 Definitions, abbreviations and symbols
3.1 Definitions
Replace the existing titles by the following new titles:
3 Terms and definitions, abbreviations and symbols
3.1 Terms and definitions
Page 20
3.1.35
Replace the existing term number, term, definition and NOTE by the following new term
number, term, definition and NOTE:
3.1.45
insertion loss
loss incurred by inserting a device between a source and load of equal impedance. The
device itself may have a different impedance from the load and source impedance
NOTE The terms operational attenuation or operational insertion loss are sometimes associated with this
definition.
3.1.36
Replace the existing term number and definition by the following new term number and
definition:
3.1.46
insertion loss deviation
difference between the measured insertion loss of cascaded components and the insertion
loss determined by the sum of the individual component insertion losses
3
A new edition (edition 3.0) to support measurements up to 1 000 MHz is under consideration.
---------------------- Page: 7 ----------------------
– 6 – 11801 Amend. 1 © ISO/IEC:2008(E)
Page 21
3.1.41
Replace the existing term number and definition by the following new term number and
definition:
3.1.51
link
transmission path between two cabling system interfaces, including the connections at each
end
Pages 17 to 23
Insert, in the existing list of terms and definitions, the following new terms and definitions in
alphabetical order and renumber the existing terms and definitions accordingly:
3.1.2
alien (exogenous) crosstalk
signal coupling from a disturbing pair of a channel to a disturbed pair of another channel
NOTE This also applies to the signal coupling from a disturbing pair within a permanent link or component, used
to create a channel, to a disturbed pair within a permanent link or component, used to create another channel.
3.1.3
alien (exogenous) far-end crosstalk loss (AFEXT)
signal isolation between a disturbing pair of a channel and a disturbed pair of another
channel, measured at the far-end
NOTE This also applies to the measurement of the signal isolation between a disturbing pair within a permanent
link or component, used to create a channel, and a disturbed pair within a permanent link or component, used to
create another channel.
3.1.4
alien (exogenous) near-end crosstalk loss (ANEXT)
signal isolation between a disturbing pair of a channel and a disturbed pair of another
channel, measured at the near-end
NOTE This also applies to the measurement of signal isolation between a disturbing pair within a permanent link or
component, used to create a channel, and a disturbed pair within a permanent link or component, used to create another
channel.
3.1.7
attenuation to alien (exogenous) crosstalk ratio at the far-end (AACR-F)
difference, in dB, between the alien far-end crosstalk loss from a disturbing pair of a channel
and the insertion loss of a disturbed pair in another channel
NOTE This also applies to the calculation using the alien far-end crosstalk loss from a disturbing pair within a
permanent link or component, used to create a channel, and the insertion of a disturbed pair within a permanent
link or component, used to create another channel.
3.1.8
attenuation to alien (exogenous) crosstalk ratio at the near-end (AACR-N)
difference, in dB, between the alien near-end crosstalk loss from a disturbing pair of a
channel and the insertion loss of a disturbed pair in another channel
NOTE This also applies to the calculation using the alien near-end crosstalk loss from a disturbing pair within a
permanent link or component, used to create a channel, and the insertion loss of a disturbed pair within a
permanent link or component, used to create another channel.
3.1.9
attenuation to crosstalk ratio at the far-end (ACR-F)
difference, in dB, between the far-end crosstalk loss from a disturbing pair of a channel and
the insertion loss of a disturbed pair of the same channel
---------------------- Page: 8 ----------------------
11801 Amend. 1 © ISO/IEC 2008(E) – 7 –
NOTE This also applies to the calculation using the far-end crosstalk loss from a disturbing pair within a
permanent link or component, used to create a channel, and the insertion loss of a disturbed pair within the
permanent link or component, of the same channel.
3.1.10
attenuation to crosstalk ratio at the near-end (ACR-N)
difference, in dB, between the near-end crosstalk loss from a disturbing pair of a channel and
the insertion loss of a disturbed pair of the same channel
NOTE This also applies to the calculation using the near-end crosstalk loss from a disturbing pair within a
permanent link or component, used to create a channel, and the insertion loss of a disturbed pair within the
permanent link or component, of the same channel.
3.1.11
average power sum alien (exogenous) near-end crosstalk loss
the calculated average of the power sum alien near-end crosstalk loss of the pairs of a
disturbed channel
NOTE This also applies to the calculation using the pairs within a permanent link used to create a channel.
3.1.12
average power sum attenuation to alien (exogenous) crosstalk ratio far-end
the calculated average of the power sum attenuation to alien crosstalk ratio at the far-end of
the pairs of a disturbed channel
NOTE This also applies to the calculation using the pairs within a permanent link used to create a channel.
3.1.35
equal level far-end crosstalk ratio (ELFEXT)
difference, in dB, between the far-end crosstalk loss from a disturbing pair of a channel and
the insertion loss of a disturbing pair of the same channel
NOTE This also applies to the calculation using the far-end crosstalk loss from a disturbing pair within a
permanent link or component, used to create a channel, and the insertion loss of a disturbing pair within a
permanent link or component, of the same channel.
3.1.55
operating temperature
stabilised temperature of the cabling combining ambient temperature with any increase due to
the application being supported
3.1.64
power sum alien (exogenous) far-end crosstalk loss (PS AFEXT)
power sum of the signal isolation between multiple disturbing pairs of one or more channels
and a disturbed pair of another channel, measured at the far-end
NOTE This also applies to the calculation using the multiple disturbing pairs within one or more permanent links
or components and a disturbed pair within a permanent link or component, used to create another channel.
3.1.65
power sum alien (exogenous) near-end crosstalk loss (PS ANEXT)
power sum of the signal isolation between multiple disturbing pairs of one or more channels
and a disturbed pair of another channel, measured at the near-end
NOTE This also applies to the calculation using the multiple disturbing pairs within one or more permanent links
or components and a disturbed pair within a permanent link or component, used to create another channel.
3.1.66
power sum attenuation to alien (exogenous) crosstalk ratio at the far-end (PS AACR-F)
difference, in dB, between the power sum alien far-end crosstalk loss from multiple disturbing
pairs of one or more channels and the insertion loss of a disturbed pair in another channel
---------------------- Page: 9 ----------------------
– 8 – 11801 Amend. 1 © ISO/IEC:2008(E)
NOTE This also applies to the calculation using the power sum alien far-end crosstalk loss from multiple
disturbing pairs within one or more permanent links or components and the insertion loss of a disturbed pair within
a permanent link or component, used to create another channel.
3.1.67
power sum attenuation to alien (exogenous) crosstalk ratio at the near-end (PS AACR-N)
difference, in dB, between the power sum alien near-end crosstalk loss from multiple
disturbing pairs of one or more channels and the insertion loss of a disturbed pair in another
channel
NOTE This also applies to the calculation using the power sum alien near-end crosstalk loss from multiple
disturbing pairs within one or more permanent links or components, and the insertion loss of a disturbed pair within
a permanent link or component, used to create another channel.
3.1.68
power sum attenuation to crosstalk ratio at the far-end (PS ACR-F)
difference, in dB, between the power sum far-end crosstalk loss from multiple disturbing pairs
of a channel and the insertion loss of a disturbed pair in the same channel
NOTE This also applies to the calculation using the power sum far-end crosstalk loss from multiple disturbing
pairs within one or more permanent links or components, used to create a channel, and the insertion loss of a
disturbed pair within a permanent link or component, of the same channel.
3.1.69
power sum attenuation to crosstalk ratio at the near-end (PS ACR-N)
difference, in dB, between the power sum near-end crosstalk loss from multiple disturbing
pairs of a channel and the insertion loss of a disturbed pair in the same channel
NOTE This also applies to the calculation using the multiple disturbing pairs within one or more permanent links
or components, used to create a channel, and the insertion loss of a disturbed pair within a permanent link or
component, of the same channel.
3.1.70
power sum equal level far-end crosstalk ratio (PS ELFEXT)
power sum of all disturbing pairs of a channel, of the difference, in dB, between the far-end
crosstalk loss and the insertion loss of each disturbing pair
NOTE This also applies to the calculation using the multiple disturbing pairs within one or more permanent links
or components, used to create a channel, and the insertion loss of a disturbing pair within a permanent link or
component, of the same channel.
Update the reference numbers to the terms and definitions throughout the document.
Pages 23 to 24
3.2 Abbreviations
Replace the existing items as follows:
ISO International Standardisation Organisation
ELFEXT Equal level far-end crosstalk attenuation (loss)
PS NEXT Power sum NEXT attenuation (loss)
PS ELFEXT Power sum ELFEXT attenuation (loss)
PS FEXT Power sum FEXT attenuation (loss)
---------------------- Page: 10 ----------------------
11801 Amend. 1 © ISO/IEC 2008(E) – 9 –
by the following amended items:
ELFEXT Equal level FEXT
ISO International Organization for Standardization
PS ELFEXT Power sum ELFEXT
PS FEXT Power sum FEXT (loss)
PS NEXT Power sum NEXT (loss)
Insert, in the existing Table, the following new abbreviations in alphabetical sequence:
AACR-F Attenuation to alien crosstalk ratio at the far-end
ACR-F Attenuation to crosstalk ratio at the far-end
ACR-N Attenuation to crosstalk ratio at the near-end
AFEXT Alien far-end crosstalk (loss)
ANEXT Alien near-end crosstalk (loss)
ELTCTL Equal level TCTL
PS AACR-F Power sum attenuation to alien crosstalk ratio at the far-end
PS AACR-F Average power sum attenuation to alien crosstalk ratio at the far-end
avg
PS ACR-F Power sum attenuation to crosstalk ratio at the far-end
PS ACR-N Power sum attenuation to crosstalk ratio at the near-end
PS AFEXT Power sum alien far-end crosstalk (loss)
PS AFEXT Normalized power sum alien far-end crosstalk (loss)
norm
PS ANEXT Power sum alien near-end crosstalk (loss)
PS ANEXT Average power sum alien near-end crosstalk (loss)
avg
Pages 24 and 25
3.3.1 Variables
Insert, in the existing list, the following new variables in alphabetical order:
l number of the disturbing channel
N number of disturbing channels
Page 25
3.3.2 Indices
Insert, in the existing list, the following new indices in alphabetical order:
avg index to denominate average of the associated parameter across all of the pairs in
the same channel or permanent link
norm index to denominate scaling of the associated parameter
Page 25
4 Conformance
Replace the entire text of this clause by the following text.
For a cabling installation to conform to this International Standard the following applies.
a) The configuration and structure shall conform to the requirements outlined in Clause 5.
b) The performance of balanced channels shall meet the requirements specified in Clause 6.
---------------------- Page: 11 ----------------------
– 10 – 11801 Amend. 1 © ISO/IEC:2008(E)
This shall be achieved by one of the following:
1) a channel design and implementation ensuring that the prescribed channel
performance is met;
2) attachment of appropriate components to a permanent link or CP link design
meeting the prescribed performance class of Clause 6 and Annex A. Channel
performance shall be assured where a channel is created by adding more than one
cord to either end of a link meeting the requirements of Clause 6 and Annex A;
3) using the reference implementations of Clause 7 and compatible cabling
components conforming to the requirements of Clauses 9, 10 and 13, based upon a
statistical approach of performance modelling.
4
Until amendment 2 of ISO/IEC 11801:2002 has been published:
• conformance for Classes D, E and F with regards to TCL, ELTCTL and coupling
attenuation can only be achieved by option 1) above;
• conformance for Classes E and F can only be achieved by option 1) above.
A A
c) The implementation and performance of optical fibre cabling channels shall meet the
requirements specified in Clause 8.
d) The interfaces to the cabling at the TO shall conform to the requirements of Clause 10
with respect to mating interfaces and performance.
e) Connecting hardware at other places in the cabling structure shall meet the performance
requirements specified in Clause 10.
f) If present, screens shall be handled as specified in Clause 11.
g) System administration shall meet the requirements of Clause 12.
h) Regulations on safety and EMC applicable at the location of the installation shall be met.
In the absence of the channel, the conformance of the link shall be used to verify
conformance with the standard.
Specifications marked "f.f.s." are preliminary specifications, and are not required for
conformance to this International Standard.
Page 30
5.5 Accommodation of functional elements
Replace the existing text of the last paragraph of this subclause by the following new text:
Telecommunications outlets are typically located in the work area.
4
Amendment 2 to ISO/IEC 11801 is under consideration.
---------------------- Page: 12 ----------------------
11801 Amend. 1 © ISO/IEC 2008(E) – 11 –
Page 37
Figure 10
Replace the title of this Figure by the following new title:
Figure 10 – Balanced cabling: channel, permanent link and CP link
Page 38
6.2 Layout
Replace the existing text of the third paragraph by the following new text and note:
The performance limits for balanced cabling channels are given in 6.4. These limits are
derived from the component performance limits of Clause 9 and 10 using reference
implementations specified in Clause 7.
NOTE Component performance requirements for Category 6 and Category 7 will be available in amendment 2
A A
to ISO/IEC 11801:2002.
Replace, on page 39, the existing text of the first paragraph by the following new text:
The performance limits for balanced cabling permanent links and CP links are given in
Annex A. These limits are derived from the component performance limits of Clauses 9 and
10 using reference implementations specified in Clause 7.
NOTE Permanent link and CP link requirements for Class E and Class F will be available in amendment 2 to
A A
ISO/IEC 11801:2002.
Page 39
6.3 Classification of balanced cabling
Replace, in the existing list, Class E and Class F by the following:
Class E is specified up to 250 MHz.
Class E is specified up to 500 MHz.
A
Class F is specified up to 600 MHz.
Class F is specified up to 1 000 MHz.
A
Page 39
6.4.1 General
Add, at the end of the second paragraph, the following new sentence:
For the purposes of this standard, insertion loss is measured with source and load
impedances of 100 Ω.
Add, at the end of the third paragraph, the following new sentence:
When required for assessment, channels shall be measured according to IEC 61935-1, unless
otherwise specified in this clause.
---------------------- Page: 13 ----------------------
– 12 – 11801 Amend. 1 © ISO/IEC:2008(E)
Page 39
6.4.2 Return loss
Replace, on page 40, the existing Tables 2 and 3, by the following new Tables 2 and 3:
Table 2 – Return loss for channel
Class Frequency Minimum return loss
MHz dB
C
1≤ f ≤ 16 15,0
1≤ f < 20 17,0
D
20≤ f ≤ 100 30− 10 lg( f )
1≤ f < 10 19,0
E 10≤ f < 40 24− 5 lg( f )
40≤ f ≤ 250 32− 10 lg( f )
1≤ f < 10 19,0
10≤ f < 40 24− 5 lg( f )
E
A
40≤ f < 398.1 32− 10 lg( f )
398.1≤ f ≤ 500 6,0
1≤ f < 10 19,0
10≤ f < 40 24− 5 lg( f )
F
40≤ f < 251,2 32− 10 lg( f )
251,2≤ f ≤ 600 8,0
1≤ f < 10 19,0
10≤ f < 40 24− 5 lg( f )
40≤ f < 251,2 32− 10 lg( f )
F
A
251,2≤ f < 631 8,0
631≤ f ≤ 1 000 36− 10 lg( f )
Table 3 – Informative return loss values for channel at key frequencies
Frequency Minimum return loss
MHz dB
Class C Class D Class E Class E Class F Class F
A A
1 15,0 17,0 19,0 19,0 19,0 19,0
16 15,0 17,0 18,0 18,0 18,0 18,0
100 N/A 10,0 12,0 12,0 12,0 12,0
250 N/A N/A 8,0 8,0 8,0 8,0
500 N/A N/A N/A 6,0 8,0 8,0
600 N/A N/A N/A N/A 8,0 8,0
1 000 N/A N/A N/A N/A N/A 6,0
---------------------- Page: 14 ----------------------
11801 Amend. 1 © ISO/IEC 2008(E) – 13 –
Page 40
6.4.3 Insertion loss/attenuation
Replace, on page 41, the existing Tables 4 and 5, by the following new Tables 4 and 5:
Table 4 – Insertion loss for channel
a
Frequency Maximum insertion loss
Class
MHz dB
f = 0,1 16,0
A
f = 0,1 5,5
B
f = 1 5,8
1≤ f ≤ 16
C
1,05×(3,23 f)+ 4× 0,2
1≤ f ≤ 100
D
1,05×(1,910 8 f + 0,022 2× f + 0,2 f)+ 4× 0,04× f
1≤ f ≤ 250
E
1,05×(1,82 f + 0,016 9× f + 0,25 f)+ 4× 0,02× f
1≤ f ≤ 500
E
1,05×(1,82 f + 0,009 1× f + 0,25 f)+ 4× 0,02× f
A
1≤ f ≤ 600
F
1,05×(1,8 f + 0,01× f + 0,2 f)+ 4× 0,02× f
1≤ f ≤ 1 000
F
1,05×(1,8 f + 0,005× f + 0,25 f)+ 4× 0,02× f
A
a
Insertion loss (IL) at frequencies that correspond to calculated values of less than 4,0 dB
shall revert to a maximum requirement of 4,0 dB.
Table 5 – Informative insertion loss values for channel at key frequencies
Maximum insertion loss
Frequency
dB
MHz
Class A Class B Class C Class D Class E Class E Class F Class F
A A
0,1 16,0 5,5 N/A N/A N/A N/A N/A N/A
1 N/A 5,8 4,2 4,0 4,0 4,0 4,0 4,0
16 N/A N/A 14,4 9,1 8,3 8,2 8,1 8,0
100 N/A N/A N/A 24,0 21,7 20,9 20,8 20,3
250 N/A N/A N/A N/A 35,9 33,9 33,8 32,5
500 N/A N/A N/A N/A N/A 49,3 49,3 46,7
600 N/A N/A N/A N/A N/A N/A 54,6 51,4
1 000 N/A N/A N/A N/A N/A N/A N/A 67,6
---------------------- Page: 15 ----------------------
– 14 – 11801 Amend. 1 © ISO/IEC:2008(E)
Page 41
6.4.4.1 Pair-to-pair NEXT
Replace, on page 42, the existing Tables 6 and 7, by the following new Tables 6 and 7:
Table 6 – NEXT for channel
a
Frequency Minimum NEXT
Class
MHz dB
f = 0,1 27,0
A
0,1≤ f ≤ 1 25 - 15 lg ( f )
B
1≤ f ≤ 16 39,1 - 16,4 lg ( f )
C
65,3 − 15 lg ( f ) 83 − 20 lg ( f )
⎛ ⎞
⎜ ⎟
− 20 − 20
1≤ f ≤ 100 − 20 lg 10 + 2× 10
D
⎜ ⎟
⎜ ⎟
⎝ ⎠
74,3− 15 lg ( f ) 94− 20 lg ( f )
⎛ ⎞
⎜ ⎟
− 20 − 20
1≤ f ≤ 250
E - 20 lg 10 + 2× 10
⎜ ⎟
⎟
⎜
⎝ ⎠
74,3− 15 lg ( f ) 94− 20 lg ( f )
⎛ ⎞
⎜ ⎟
b, d
− 20 − 20
1≤ f ≤ 500
E - 20 lg 10 + 2× 10
A
⎜ ⎟
⎜ ⎟
⎝ ⎠
102,4− 15 lg ( f ) 102,4− 15 lg ( f )
⎛ ⎞
⎜ ⎟
− 20 − 20
1≤ f ≤ 600
F − 20 lg 10 + 2× 10
⎜ ⎟
⎜ ⎟
⎝ ⎠
105,4− 15 lg ( f ) 116,3− 20 lg ( f )
⎛ ⎞
⎜ ⎟
c, d
− 20 − 20
1≤ f ≤ 1 000
F − 20 lg 10 + 2× 10
A
⎜ ⎟
⎜ ⎟
⎝ ⎠
a
NEXT at frequencies that correspond to calculated values of greater than 65,0 dB shall revert to a
minimum requirement of 65,0 dB.
b
Whenever the Class E channel insertion loss at 450 MHz is less than 12 dB, subtract the term
A
1,4((f –450)/50) to the equation stated above for the range of 450 MHz to 500 MHz.
c
Whenever the Class F channel insertion loss at 900 MHz is less than 17 dB, subtract the term
A
2,8((f –900)/100) to the equation stated above for the range of 900 MHz to 1 000 MHz.
d
The terms in the equations are not intended to imply component performance.
---------------------- Page: 16 ----------------------
11801 Amend. 1 © ISO/IEC 2008(E) – 15 –
Table 7 – Informative NEXT values for channel at key frequencies
Minimum channel NEXT
Frequency
dB
MHz
Class A Class B Class C Class D Class E Class E Class F Class F
A A
0,1 27,0 40,0 N/A N/A N/A N/A N/A N/A
1 N/A 25,0 39,1 63,3 65,0 65,0 65,0 65,0
16 N/A N/A 19,4 43,6 53,2 53,2 65,0 65,0
100 N/A N/A N/A 30,1 39,9 39,9 62,9 65,0
250 N/A N/A N/A N/A 33,1 33,1 56,9 59,1
500 N/A N/A N/A N/A N/A 27,9 52,4 53,6
600 N/A N/A N/A N/A N/A N/A 51,2 52,1
1 000 N/A N/A N/A N/A N/A N/A N/A 47,9
Page 42
6.4.4.2 Pair-to-pair NEXT
Replace, on page 43, the existing Tables 8 and 9, by the following new Tables 8 and 9:
Table 8 – PS NEXT for channel
a
Class Frequency Minimum PS NEXT
MHz dB
62,3− 15 lg ( f ) 80− 20 lg ( f )
⎛ ⎞
⎜ ⎟
− 20 − 20
1≤ f ≤ 100
D − 20 lg 10 + 2× 10
⎜ ⎟
⎜ ⎟
⎝ ⎠
⎛ 72,3− 15 lg ( f ) 90− 20 lg ( f )⎞
⎜ ⎟
− 20 − 20
1≤ f ≤ 250 − 20 lg 10 + 2× 10
E
⎜ ⎟
⎜ ⎟
⎝ ⎠
72,3− 15 lg ( f ) 90− 20 lg ( f )
⎛ ⎞
⎜ ⎟
b, d
− 20 − 20
1≤ f ≤ 500
E − 20 lg 10 + 2× 10
A
⎜ ⎟
⎜ ⎟
⎝ ⎠
99,4− 15 lg ( f ) 99,4− 15 lg ( f )
⎛ ⎞
⎜ ⎟
− 20 − 20
1≤ f ≤ 600 − 20 lg 10 + 2× 10
F
⎜ ⎟
⎜ ⎟
⎝ ⎠
102,4− 15 lg ( f ) 113,3− 20 lg ( f )
⎛ ⎞
⎜ ⎟
1≤ f ≤ 1 000
c, d
− 20 − 20
F
− 20 lg 10 + 2× 10
A
⎜ ⎟
⎜ ⎟
⎝ ⎠
a
PS NEXT at frequencies that correspond to calculated values of greater than 62,0 dB shall revert to a
minimum requirement of 62,0 dB.
b
Whenever the Class E channel insertion loss at 450 MHz is less than 12 dB, subtract the term
A
1,4((f - 450)/50) from the equation stated above for the range of 450 MHz to 500 MHz.
c
Whenever the Class F channel insertion loss at 900 MHz is less than 17 dB, subtract the term
A
2,8((f - 900)/100) from the equation stated above for the range of 900 MHz to 1 000 MHz.
d
The terms in the equations are not intended to imply component performance.
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– 16 – 11801 Amend. 1 © ISO/IEC:2008(E)
Table 9 – Informative PS NEXT values for channel at key frequencies
Minimum PS NEXT
Frequency
dB
MHz
Class D Class E Class E Class F Class F
A A
1 60,3 62,0 62,0 62,0 62,0
16 40,6 50,6 50,6 62,0 62,0
100 27,1 37,1 37,1 59,9 62,0
250 N/A 30,2 30,2 53,9 56,1
500 N/A N/A 24,8 49,4 50,6
600 N/A N/A N/A 48,2 49,1
1 000 N/A N/A N/A N/A 44,9
Page 44
6.4.5 Attenuation to crosstalk ratio (ACR)
Replace the title and the entire existing text and tables 10 and 11 of subclause 6.4.5 as
follows:
6.4.5 Attenuation to crosstalk ratio at the near-end (ACR-N)
6.4.5.1 General
ACR-N requirements are applicable to Classes D, E, E , F and F only.
A A
In prior editions of this standard, the term ACR was used. Except for the name, the definition
and equations for ACR-N are identical t
...
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