Here's a look at the key developments at the recent TR-42 committee meetings in Vancouver.
November 1, 2000
The TR-42 Engineering Committee and associated Subcommittees for Telecommunications Cabling Infrastructure met during the week of August 14th in Vancouver. The following is a summary of the major developments that took place at the meetings:
BALLOTS IN PROGESS
Standards Proposal No. 4425-B to be published as TIA/EIA 568-B.1. This document was reviewed in the TR-42.1 Subcommittee and the ballot comments were resolved. It was agreed to distribute a default ballot covering two remaining issues:
1. Patch cord bend radius — A task group was formed to develop a recommendation on patch cable bend radius by November 1. If a recommendation is ready, it will be included in a default ballot; if a recommendation is not ready, the proposal will contain a note that the minimum bend radius conditions for patch cables are under further study.
2. Channel testing — A note will be added which indicates that channel testing is recommended if cross-connections are used.
Standards Proposal No. 4722-A, to be published as Addendum 5 to ANSI/TIA/EIA-569-A on underfloor pathways. This document was reviewed in the TR-42.3 Subcommittee and the ballot comments were resolved. It was agreed to distribute a default ballot covering some technical changes to definitions and drawings.
PN-3727 document entitled, “Transmission Performance Specifications for 4-Pair 100 W Category 6 Cabling”. This document was reviewed in the TR-42.7 Subcommittee. Significant progress was made in resolving outstanding issues on channel modelling and cable temperature. This document still contains some TBDs (to be determined) for balance parameters and de-embedded plug FEXT procedures. However, it was agreed to distribute draft 7 of the proposed Category 6 standard for a 30-day committee (green) ballot.
PN-4655 draft document for “Building Automation Systems”. Some of the terms in the current draft must still be reviewed in the TR-42.5 Subcommittee. In addition, changes to current capacities (marked as TBD) must match the numbers in ISO SC25/WG3 document. It was agreed to distribute the draft BAS Standard for a 30-day committee (green) ballot once the aforementioned changes are implemented. A copy should go to NECA and NFPA, Panel 16.
The RJ Style Interface. A letter was issued to SC48B on the use of an RJ Style Interface for Industrial Applications. The letter stated that the TIA TR-42.9 Engineering Committee is considering the inclusion of an industrial IEC 60603-7 compatible interface, and suggests that a project be initiated within IEC 48B to address this need. When available, a draft of the connector specifications will be forthcoming.
Cable Return Loss Performance. A letter was issued to the US TAG to ISO/IEC JTC1 SC25/WG3, CENELEC TC215B on Cable return loss performance requirements. The letter states that TR-42 recommends the US TAG support the position that the return loss requirements for Category 5e and Category 6 cables (reference ANSI/TIA/EIA-568-A-5 and draft 7 of the TR-42.7 document entitled, “Transmission Performance Specifications for 4-Pair 100 W Category 6 Cabling”) replace the proposed cable return loss requirements in the ISO/IEC 11801-2000+ draft standard. In particular, TR-42 recommends that:
a 100 meter length be specified for testing cable performance,
mean characteristic impedance requirements be removed,
input impedance be derived from the TIA Category 5e and Category 6 cable return loss requirements as referenced above, and
return loss requirements be specified from 1 MHz to the highest referenced frequency.
Connector Specifications. A letter was issued to TIA FO 6.3.10 on Connector Specifications. TIA FO 6.3.10 is developing a Technical Service Bulletin (TSB) called “Generic Workmanship Guidelines for Optical Interoperability”.
The TIA TR-42 Engineering Committee supports the development of guidelines for connector endface parameter specifications. As connector specifications for singlemode performance may not be applicable for multimode terminations, TR-42 requests that specifications for multimode connectors be determined and listed separately from singlemode connectors. Additionally, TR-42 recommends the inclusion of specifications for small form factor connectors.
Additional Transmission Performance Specifications for Optical Fiber Cabling Systems. A new project was opened to develop a standard for next generation optical fiber telecommunications cabling components that are used within a commercial building (up to and including the telecommunications outlet/connector, and between buildings in a campus environment). It specifies the minimum performance requirements for the optical fiber cabling components such as cable, connectors, connecting hardware, patch cords and field test equipment. CS
Paul Kish is Director of IBDN Systems & Standards at NORDX/CDT in Pointe Claire, PQ. He is also Chair of the TR-42 engineering committee.
Disclaimer: The information presented is the author’s view and is not official TIA correspondence.