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TIA TR42 update

10GBASE-T apps, data centre best practices among topics discussed at recent meeting in San Diego.

March 1, 2011  

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I recently attended the TIA cabling standards meetings held in San Diego, Calif. The location was a welcome break from the snow and cold temperatures that have inundated eastern Canada and the U.S. this winter. While it is still fresh in my mind, I wanted to present some of the highlights from these meetings.

First, the TIA TR 42 engineering committee is broken up into several subcommittees that are responsible for developing and maintaining standards for Commercial Building Telecommunications Cabling and Data Centers (TR 42.1), Telecommunications Pathways and Spaces (TR 42.3), Telecommunications Administration (TR 42.6), Telecommunications Copper Cabling Systems (TR 42.7), Industrial Telecommunications Infrastructure (TR 42.9), Optical Fiber Systems (TR 42.11) and Optical Fibers and Cables (TR 42.12).

The key issues in each subcommittee are as follows: TR 42.1 reviewed and resolved ballot comments on draft TIA 942-A, “Telecommunications Infrastructure Standard for Data Centers.” The revised document will be issued for a 1st industry ballot.

A contribution from the U.S. Department of State, Bureau of Economic, Energy, and Business Affairs on “Green Data Centers development Best Practices” was reviewed in the subcommittee.

TR 42.3 reviewed and resolved ballot comments to draft 7 of TIA-569-C, “Telecommunications Pathways and Spaces Standard.”

A motion was approved unanimously to have the document released for a 2nd industry ballot. A report of the power separation task group was submitted and reviewed in the subcommittee.

This task group is addressing difficult issues on the subject of power separation guidelines for 10GBASE-T applications.

System test results reported by two different labs did not show any link failures when using second generation 10GBASE-T network interface cards (NICs) under worst case conditions. To date, there is insufficient data to explain performance differences that have been observed between first and second generation NICs.

TR 42.6 approved a new project request to revise TIA-606-A, “Administration Standard”. The revised TIA 606-B standard will incorporate addendum 1, harmonize with ISO/IEC 14763-2-1 and consider new technologies.

Work has already started in a task group that is developing a new section on Automated Infrastructure Management System. The automated infrastructure management system can be software based, software and hardware based, and may include technology required to communicate infrastructure changes (e.g. pre-printed serialized bar codes, human readable text, RFID chip technology, electrical continuity contacts).

The estimated date for the revised administration standard to be approved for publication is March 2013.

TR-42.7 approved PN-3-0396-A-1 (TSB-190) “Guidelines on Shared Pathways and Shared Sheaths” and SP-3-0382-B-1 (568-C.4) “Broadband Coaxial Cabling and Components Standard” for publication after a final editorial review. TR 42.7 also reviewed and resolved ballot comments on SP-3-0383-B, (TIA 1183) draft 2.0.

This is a new standard under development that describes test fixtures and procedures for “balun-less” measurements of balanced components and systems, currently specified up to 1 GHz.

A revised draft 2.1 will be sent for a second 45-day SP ballot. Concurrently, a task group was formed as part of ballot resolution of TIA 1183 to investigate extending testing bandwidth using these fixtures up to 2.0 GHz.

TR 42.7 approved a Project Authorization Request (PAR) to develop next generation balanced cabling for data transmission higher than 10Gbps. The work will be divided among several task groups. This work may form a recommendation for a new category of balanced twisted-pair telecommunications cabling and associated field testing requirements.

TR 42.9 reviewed and resolved ballot comments to draft 3 of TIA-1005-A, “Telecommunications Infrastructure Standard for Industrial Premises.” This draft contains more detailed information on Grounding and Bonding than the published TIA-1005 standard, including an illustration of a Star Grounding System.

A motion was approved to have draft 4 of the document released for industry ballot.

TR 42.11 received a contribution on a connector loss budget proposal for different channel grades. This proposal is based on allocating a statistical connector loss performance (instead of a fixed per mated pair loss) as a function of the number of mated pair connections. A straw poll indicated support for developing a TSB based on this proposal. TR 42.11 are also developing Addenda to TIA 568-C.0 and C.3 on array polarity and testing.

TR 42.12 is revising a number of FOTP documents. The subcommittee also reviewed liaison reports from ITU-T, IEC SC86A and ICEA. The most noteworthy work item is a newly formed task group that is investigating the impact of bend insensitive multimode fiber (BIMMF) on connector loss, numerical aperture, core size and bandwidth measurements. This subject has garnered a lot of attention recently in the industry. There is a lot more work that needs to be done and it may take up to a year to get all the answers.

As you can see from this brief overview, there are a lot of activities that are taking place in the TIA standards groups in order to introduce new technologies and in support of higher speed applications. CNS

Paul Kish is Director, Systems and Standards at Belden. The information presented is the author’s view and is not official TIA correspondence.