Fluke Networks

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Fluke Networks Your Partner in Network Testing
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• Copper Testing Standards Update

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Types of Standards

• Component specifications
• Define performance and grades of cables,
  connectors and hardware
• Example ANSI/TIA/EIA 568-B.2
• Installed Link Specifications
• Permanent Link and Channel
• Example ANSI/TIA/EIA 568-B.1
• Network Technology Standards (Applications)
• Define performance requirements for all elements
  of a the network
• Example IEEE 802.3

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Developments in Cabling Requirementsfor 10
Gigabit Ethernet

• The IEEE 802.3an committee is studying the
  implementation for 10 Gigabit Ethernet over
  twisted-pair copper cabling (10GBASE-T)
• Several companies are actively participating in
  the study of medium performance parameters and
  transmission requirements to support 10GBASE-T
• This high-performance cabling system will require
  a high-performance field tester
• Increased frequency range (1 to 500 MHz)
• Higher accuracy specification (Accuracy Level
  IIIe and IV)
• Capable of supporting Alien Crosstalk measurements

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10GBASE-T

• IEEE 802.3an task force has delegated study of
  the physical medium to TIA and ISO/IEC workgroups
• The signal-to-noise ratio budget analysis is
  complex and consists of two components
• In-channel requirements for all parameters, are
  initially set to ISO/IEC 11801 Class E limits,
  extended to 500 MHz
• Between-Channel crosstalk requirements are
  becoming very important in the Signal-to-Noise
  Ratio
• Referred to as Alien Crosstalk
• Also known as Alien NEXT or Alien FEXT

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Alien Crosstalk

• Crosstalk induced in a wire-pair in the (victim)
  cable by wire-pairs in adjacent cables
  (disturbers) in the bundle
• General rules
• This crosstalk is worst between wire-pairs with
  the same twist rate
• The effect is greater if cables stay in parallel
  at the link ends
• Impact increases with the distance over which the
  cables run in parallel
• Impact increases with the frequency of the
  transmitted signals

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Development Status of 10 Gigabit Ethernet

• IEEE 802.3an 10GBASE-T standard
• Expected to pass June-July 2006
• Includes references to TIA and ISO/IEC for
  physical medium
• A single testing methodology for field testing of
  Alien Crosstalk will be included in TIA, ISO and
  IEEE as the only standards-compliant methodology
  for field testing of Alien Crosstalk

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Status on TIA and ISO

• ANSI/TIA-TSB-155 Additional Guidelines for
  4-pair 100 O Category 6 Cabling for 10GBASE-T
  Applications.
• This document creates the guidelines how Cat 6
  links can be certified for the 10Gb/s Ethernet
  application.
• Expected to pass Q3 2006.
• ANSI/TIA/EIA-568-B.2-10 Transmission
  performance specifications for 4-pair 100 O
  augmented Category 6 cabling.
• This amendment 10 defines a new cabling type
  called Augmented Cat 6 abbreviated as Cat 6A.
• Expected to pass Q1-Q2 2007
• ISO/IEC 11801 Edition 2.1 (draft) Information
  Technology Generic cabling for customer
  premises. (Draft document number ISO/IEC JTC 1/SC
  25 N 755.
• This document will include the definition of
  Augmented Class E and Augmented Class F cabling
  systems.
• Expected to pass Q4 2006.
• ISO/IEC 24750 Guidelines for support of
  10GBASE-T over Copper Balanced pairs of Class E
  and Class F as per ISO/IEC 118012002 and
  IEEE802.3an.
• This is a Working Draft for an amendment to
  ISO/IEC 118012002.
• Expected to pass Q1 2007

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Cable Types Expected to Support 10GBASE-T
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10Gig over Copper Solution for Field Testing
and Certification
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Alien Crosstalk measurement methodsPair-To-Pair
Alien NEXT Measurements

• The main and remote units are sitting
  side-by-side at one end of the cabling bundle
  under test.
• These units are plugged into different cables.
• A standard patch cord connects the
  synchronization of the Alien Crosstalk modules
  plugged into each of the testers to allow the
  testers to perform all of the pair-to-pair NEXT
  measurements between the wire pairs of the two
  selected cabling links.

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Alien Crosstalk measurement methodsPair-To-Pair
Alien FEXT Measurements

• The main and remote units are plugged into
  different cabling links at opposite ends of the
  bundle under test.
• A spare channel in this bundle (not to be used as
  disturber or victim) connects the synchronization
  modules to allow the testers to perform all of
  the pair-to-pair FEXT measurements between the
  wire pairs of selected cabling links.

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Field Testing Alien Crosstalk

• Perform In-Channel certification using the
  appropriate test standard
• IEEE 10GBASE-T, Cat 6A or ISO Class EA
• Save the test results using results management
  software and create a project file
• Tester setup for PSANEXT
• Insert the Alien Crosstalk modules in Main and
  Remote Cable Analyzer units
• Connect main unit with USB cable to PC
• Connect the testers as shown in previous slide
• Plug terminators into victim and selected
  disturber links
• Launch PSAXTalk software on PC and select cabling
  links to test
• See next slide

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Selection of Cabling Links in the Tests

• Disturbed (or victim) linksSelect the longest
  links in the installation
• Links with the highest Insertion Loss
• IEC recommends to pick the 10 longest links
• TIA recommends to pick the 6 longest links
• Identify the bundles to which these longest links
  belong
• All links in these bundles should be used as
  disturbers in calculating the PSAXTalk
  performance
• This is an important argument to keep the number
  of links in each bundle relatively small
• In addition, verify that all cables in adjacent
  panel jacks have been included in the test as
  well
• If they have not, they should be added to the
  list of disturbers

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Test Result with One Disturber PSAELFEXT
Test limit line for individual pair measurements
Test limit line for average of four pairs
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Test Result with Mulitple Disturbers PSAELFEXT