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  • Standards compliant testing of Cat.6A permanent

    links is a true foundation for an in interoperable

    and trouble free performing channel

    Christian SchillabProduct Manager InfrastructureSuperVision

    Fluke Networks EuropeMember British Standards Institute Working Group TCT 7/-/1

    & CENELEC TC215 WG1 PTH und PTT

    christian.schillab@flukenetworks.com

    mailto:christian.schillab@flukenetworks.com

  • 2

    The Goal Of This Presentation

    Update on the relevant testing standards and

    introduction to the feature set to look for in a

    field tester, which is capable to test a system for

    10GABSE-T readiness or Cat.6A compliance

  • 3

    Agenda

    10Gigabit Ethernet

    What are we testing ?

    Testing Models and Connectivity

    Significance of the test plug

    Accuracy

  • 4

    Development of 10GBase-T

    IEEE (Institute of Electrical and Electronics Engineers) 802.3an task force

    Develop 10 Gb/s Ethernet application over twisted pair copper medium

    (10GBASE-T)

    Define signal encoding and requirements for electronic devices and used

    bandwidth up to 500MHz

    IEEE is focused on the Channel requirements for 10 Gb/s transmission

    Study and develop the detailed specifications of the physical medium

    (twisted-pair copper cabling) in cooperation with ISO/IEC and TIA

    workgroups

  • 5

    Twisted-Pair Cabling Expected to Support 10GBASE-T

    Currently Installed Cabling Channel

    Length

    (m)

    Comments

    ISO Class F 100 Supported (IEEE objective)

    ISO Class E/

    TIA Cat 6 UTP

    55 (33?) Supported (IEEE objective)

    ISO Class E ScTP 100 Expected to meet requirements

    ISO Class E /

    TIA Cat 6

    55 to 100 Requires additional (field) test of PS AXTalk

    parameters

    New Cabling

    TIA: Augmented Cat.6 (Cat.6A)

    ISO: Class EA

    100 Some standards still in progress

    Only channel requirements are final in all

    ISO/IEC, TIA and CENELEC

  • 6

    Twisted-Pair Cabling supporting 10GBASE-TThe role for field testing !

    Currently Installed

    Cabling

    Channel

    Length (m)

    Comments

    ISO Class F 100 Supported (IEEE objective)

    ISO Class E/

    TIA Cat 6 UTP

    55 (33) Supported (IEEE objective) (*)

    ISO Class E ScTP 100 Expected to meet requirements

    ISO Class E /

    TIA Cat 6

    55 to 100 Requires additional (field) test of PS AXTalk

    parameters (*)

    New Cabling

    TIA: Augmented Cat 6

    ISO: Class EA

    100 Some standards still in progress

    Only channel requirements are final in all

    ISO/IEC, TIA and CENELEC

    Expected !?!?

    How to make sure?

    TEST per

    TSB-155 or ISO-TR24750

    1.AXT parameters

    are not depending on

    workmanship and met

    By Design

    2.Pair to Pair (In

    Channel) parameters

    continue to depend

    on workmanship

    needs testing

  • 7

    PATCH

    CORD

    Cross-

    connect

    Panel

    HORIZONTAL CABLE

    TO

    PATCH

    CORD

    WORKSTATION

    TELECOMMUNICATIONS

    ROOM

    WORK AREA

    Testing The CHANNEL

    CP *

    * Consolidation Point

    (Optional)

    excluded from

    the measurement

    excluded from the

    measurement

  • 8

    Test

    Leads HORIZONTAL CABLE TO

    Test

    Leads

    WORK AREA

    Testing the Permanent Link

    CP *

    * Consolidation Point (Optional)

    Measurement does not

    include contributions by the

    test leads but does include

    the mated NEXT and RL of

    test plug and jack

  • 9

    Definition for a PATCH CORD Test Head

    How the standards establish limits..

    Definition of requirements and limits for the CHANNEL: Length,

    Crosstalk, Reflections, Attenuation

    Requirements for the Permanent LINK

    Requirements for components: Plugs & Jacks (CHW),

    Cables

    Definition of the component test procedure

    Range of

    TEST Plugs

    Certification of compliant jacks in

    laboratories

    The way to INTEROPERABILITY !Permanent Link = True foundation for a buildings cabling infrastructure

  • 10

    Example: System Solution vs. Mix & Match Manufactuere A and B belong to the top 10

    Both offer Cat.6A products since 2006

    5.7 4.3

    0.1

    0.0

    System Solution

    Mix &

    Match

  • 11

    Background on test plugs

    QUESTIONS:

    Why is the test plug so

    important ?

    Who defines the

    properties of a test plug ?

    What could it be compared

    with ?

    ANSWERS:

    All modular jacks (RJ45) use

    compensation to achieve

    Cat.5e/Cat.6/Cat.6a performance

    Experts in the standards bodies

    define procedures for the selection of

    test plugs

    It could be compared with the meter

    prototype established by the

    Acadmie Des Sciences in Paris in

    the 17th century

  • 12

    NEXT Compensation ?What if the test plug is different or wrong ?

    Case A B C

    Test plug properties Compliant & centered Better &

    non-compliant

    Worse &

    non-compliant

    NEXT at 100 MHz - 37dB - 39dB - 35dB

    mV/V 14 11 18

    Mated NEXT Compliant =

    better -54db (2mV)

    Non-compliant Non-compliant

    Comment The jack is over

    compensating

    The jack is under

    compensating

    jackplug

    mated

    jackplug

    matedjack

    plug

    mated

    Conclusion:

    Wrong Test Plug = Wrong Test Result !!!

  • 13

    The significance of the test plug when testing the Permanent Link in an installation or components for compliance in a laboratory

    This is TRUE

    The standards define the properties of a test plug

    In the laboratory a set of test plugs low / centered / high - is used to certify the compliance of a component

    Testing with a compliant and centered test plug is a true foundation for a compliant link and channel without a test of the channel

    A non compliant test plug could show optimistic results with a non-compliant jack. The odds are 50/50

    This is NOT TRUE

    A regular patch cord has a centered plug

    A patch cord can be used to achieve reproducible results

    A normalization process can be used to compensate for non-centered or undefined test plugs

    A non-compliant cord represents a worst case scenario.

  • 14

    Cat.6A = an other Cat.6 Dj Vu ?

    Definition of requirements and limits for the CHANNEL: Length,

    Crosstalk, Reflections, Attenuation

    Requirements for the Permanent LINK

    Requirements for components: Plugs & Jacks (CHW),

    Cables

    Definition of the component test procedure

    Range of

    TEST PlugsCertification of compliant jacks

    Definition for a PATCH CORD Test Head

    TIA finished Feb.8, 2008 TIA-568B.2 Addendum 10

    wich is based on Draft 10

  • 15

    ISO/IEC Class EA = Cat.6 Dj Vu ?

    Definition of requirements and limits for the CHANNEL: Length,

    Crosstalk, Reflections, Attenuation

    Requirements for the Permanent LINK DRAFT

    Requirements for components: Plugs & Jacks (CHW),

    Cables DRAFT

    Definition of the component test procedure

    Range of

    TEST PlugsCertification of compliant jacks

    Definition for a PATCH CORD Test Head

    Component Test Procedure: First DRAFT

  • 16

    In the field:

    A PCB based test plug has proven to

    provide reproducible results

    First version in 2001

    NEW version in 2007: DTX-PLA002

    with a replaceable tip

    In the laboratory: The setup is very complex

    Typically many test plugs had to be sampled to

    find the max. of 12 needed (Cat.6 / 250MHz)

    PCB based test plugs are a convenient and

    reliable alternative

    The standards recognizes the benefit

    of a PCB based test plug

    If a test plug looks different from a patch cord

    ../../../../DSP/Competition/Ideal/LT_WS2/Pictures/IMG_1670.JPG

  • 17

    Benefits of a rugged test plug with replaceable tips ?

    1. The cost of ownership (COO) is reduced significantly if only the

    contact block needs replacing

    2. A solid metal case will wear little.

    example shows a test plug

    after 17780 insertions

    3. There is no tab which might break off

  • 18

    Cat.6A and Class EAwhat it is important to keep in mind ?

    Component specification were either finalized only recently or they are still in draft. TIA-568B Add.10 was finished only recently Feb.8

    The manufacturers warranty program will determine whether the Channel or Permanent Link is tested

    Certification of the CHANNEL could be important for System Solutions (single source)

    Performance margins will be significantly smaller than with Cat.6

    Alien Crosstalk is a parameter of large significance.

  • 19

    0.0

    10.0

    20.0

    30.0

    40.0

    50.0

    60.0

    70.0

    0 100 200 300 400 500 600

    TIA Cat.6a

    10GBASE-T

    Cat.6 CH

    Cat.5e CH

    1000BASE-T

    MHz

    dB

    NEXT Anforderungen

    Slim performance margins of early Cat.6A systems demand high accuracy from the field tester !

    Better then Level-IIIe ?

    1000BASE-T works with Class.D/Cat.5e !

    1000BASE-T allowed Room for Error

    or Optimism

    10GBASE-T gives little room for error

    First 10G NICS are expected for 2008 !

    NEXT Requirement

  • 20

    ISO/IEC 619