Werner Heeren Fluke Networks Europe werner'heerenflukenetworks'com Dubai 2003 June 1

1
Ratification of Cat.6 affected recommended
practices for field testing ofLinks, Channels,
Patch Cords and Cable.

• Werner HeerenFluke Networks Europewerner.heeren_at_
  flukenetworks.comDubai - 2003 June 1

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Cat 6 Standard has been Approved

• TIA/EIA-568-B.2-1 (Addendum 1)
• The last challenge Fine tune the performance
  specification of the Cat 6 connecting hardware
• Component measurement methodology
• Plug characterization amplitude and phase
  specification of NEXT disturbance signals
• Fluke Networks has actively contributed to
  standards RD efforts
• Goal achieve interoperability (as well as
  backwards compatibility)

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Purpose of industry Standards(TIA ISO)

• Define an application independent, open system
• Provide guidance for building professionals to
  allow for a cabling infrastructure before
  specific requirements are known
• Define a flexible cabling scheme such that
  modifications are both easy and economical
• Define a cabling system that supports current
  applications and that is a basis for future
  development of network products

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Testing the Permanent Link
Test results do not include contributions by the
tester patch cables
TO
CP
TESTER PATCH CABLE
HORIZONTAL CABLE
TESTER PATCH CABLE
WORK AREA
Consolidation Point (Optional)
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A detailed look at the Permanent Link

• The Permanent portion of the cabling link
• it does not include the adapter cords !

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NEXT Variability In Connections
Variability from the patch cord plug mating

• Significant for NEXT,
• much less for Return Loss!
• The PL test model renders worst case test !

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..De-Embedded ? ...Compliant ?? ...Centered
??? ..Universal ???? explained in 5 minutes

• An attempt !!!

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Category 6 Connector family affairs
?
OR
poor poor good
poor poor not good enough
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The balancing act for connector NEXT
37 dB ? dB
37 dB 0.6 dB
gt54dB
Jack
Plug
Point of observation
If the plug and jack like each other they can
achieve a Mated NEXT of gt 54 dB
NOTELarge dB value GOODSmall dB value POOR
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Cat.6 Performance of miscellaneous Jacks and
Plugs
Cat.6 Jack Plug
Cat.6 Jack Plug
Class E Jack Plug
Cat.6 Jack Plug
Cat.6 Limits(54/52.5db at 100 Mhz)
NEXT Values _at_ 100 MHz (Paar 1-3) for 4 different
Cat.6 Systems
Cat.5 Limit
35
39
36
34
37
38
Cat.5e Plug Range
Cat.6 Plug Range as per TIA-568B.2-1
Courtesy NEXANS
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How does one determine the de-embedded values

• Its complex !
• It can be done in the lab only
• Only a few are up todo it
• An ongoing round robinis backing results up

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How is it possible to pick a centered plug ?

• Method ASelect from a large number of
  conventional IDC based plugs
• Time consuming (expensive)
• Bad yield - only a few will be centered on
  allwire pairs

• Method BUse a printed circuit board based
  solution
• close to neglectable variation
• All pairs are centered

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Conclusions

• Using the right plug is crucial
• Today only a standads compliant TIA compliant
  plug can be right plug
• Using a compliant as well as centered plug is
  beneficial
• A universal plug is electromechanical voodoo

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Patch Cord and Spool Test
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Problem Solution

• Field test paradigm
• (1) Test permanent link model
• (2) If pass, add compliant patch cords to
  complete end-to-end channel connection
• (3) This channel is compliant without
  re-certifying with a Channel test
• Key issue
• Do you know whether your patch cords comply
  with the standard?

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Patch Cord Performance is very Important to the
Channel

• Proximity to the transmitter
• Impact of NEXT in Patch cord and mated connection
• Impact of RL in patch cord cable

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Patch Cord Performance is very Important to the
Channel

• Most important is the mated NEXT performance of
  the plugs at the end of the patch cord also due
  to their proxomity to the transmitter
• Impact of NEXT in Patch cord and mated connection
• Major impact on RL of the channel
• Impact of RL in patch cord cable
• Test must include full evaluation of both of
  these parameters

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Standards Define Patch Cord Test

• TIA/EIA-568-B.2-1
• Paragraph 7.2.1.3 NEXT Loss
• NEXT Loss of near-end connection
• Worst-case addition of the NEXT Loss of the
  remote connection compensated for the round trip
  attenuation of the cable
• Plus NEXT of patch cord cable
• Plus an allowance for reflected FEXT (0.5 dB)
• NEXT Loss test limits of patch cords is
  length-dependent
• Very similar to latest draft of IEC 61935-2 (now
  in FDIS)

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NEXT, RL and Wiremap Measurement
Tester Adapter
Tester Adapter
AdapterModular Jacks
Remote Unit
Main Unit

• NEXT measurement
• Modular jacks must be selected to meet but not
  exceeed the Cat 6 component-level definition
  (centered and critical)
• These jacks can also be used to certify Cat 5e
  patch cords

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Testing the Channel
TELECOMMUNICATIONSROOM
Consolidation Point (Optional)
WORK AREA
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Can I test a patch cord as a channel ?
End of Channel

• Channel test excludes the end connectors
• Limit line assumes
• Up to 90 m of horizontal cable
• Up to 10 m of patch cord
• Up to four (4) connecting points

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Can I test a patchcord in Channel with a Golden
Link ?

• Common practice in the past
• Was o.k. with proprietary systemAlso here one
  of the connectors NEXT is excluded (needs testing
  twice)
• Exceptionally performing jacks or non centered
  jacks would hide bad patch cords or non
  compliant cords
• Exceptional horizontal cabling (NEXT RL) would
  hide bad patch cords as well

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Problem - Solution

• Verify the quality of the cable before installing
  or processing
• Horizontal Links (solid core)
• Patch Cords (stranded)
• A single ended test allows the testing of 300,
  500 1000m spools
• Supports solid core horizontal cable and stranded
  cable to construct patch cords

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Test Setup
Select appropriate standard in the Setup mode
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Spool Test Results
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Thank you for your time and interest.Questions?
Werner HeerenFluke Networks Europewerner.heeren_at_
flukenetworks.com