ITU-T Agrees to Agilent-Initiated O.172 Appendix VII Draft Procedure

10/25/2004 - Agilent Technologies Inc. (NYSE: A) announced that at a meeting of the International Telecommunications Union (ITU) Study Group 4, the Jitter Working Party has agreed in principle to the draft of ITU-T O.172 Appendix VII, "Method for Verification of Measurement Result Accuracy and Intrinsic Fixed Error." The methodology and content of O.172 Appendix VII was initiated and driven by Agilent, primarily from its facility in South Queensferry, Scotland, which is the design and production center for its OmniBER family of jitter measuring equipment. The September 2004 meeting was hosted at this facility and involved participants from the leading jitter test equipment manufacturers and standards bodies.

O.172 Appendix VII provides a procedure for verifying receiver accuracy of jitter measuring equipment, and requires the production of jitter "accuracy maps," which provide detailed indications of individual receiver accuracy performance. The draft will be submitted for ratification at the next ITU-T Study Group 4 meeting in early 2005.

"Since its inception, Recommendation O.172 has specified the measurement accuracy of jitter instruments but has not detailed how to verify this performance," said David Taylor, Agilent's representative (ITU "rapporteur") on the ITU-T Jitter Working Party. "The new O.172 Appendix VII will fill this gap and provide the basis for receiver-only performance calibration and specification, enhancing accuracy and box-to-box result consistency."

An O.172 Appendix VII-based accuracy enhancement is already standard on Agilent's OmniBER OTN jitter products, and provides a receiver-only, fixed jitter accuracy specification of 15 mUI. In addition, O.172 Appendix VII accuracy maps (for both 2.5 and 10 Gb/s rates) are supplied with every new OmniBER OTN unit.

Another new O.172 proposal, Appendix VIII "Method for Characterization of Transmit Intrinsic Jitter," was also discussed at the meeting. This appendix serves as a diagnostic tool for the characterization of test equipment jitter transmitters under certain restricted conditions. Agilent advanced this draft appendix by proposing a new measurement algorithm, which was accepted. The Jitter Working Party also agreed in principle to this draft, which is being submitted for ratification at the early-2005 ITU-T Study Group 4 meeting.

About the Agilent OmniBER OTN
The Agilent OmniBER OTN (J7231B) is a second-generation SONET/SDH jitter analyzer designed to have extremely low intrinsic jitter, a key enabler of greater measurement accuracy. It is the market-leading transport design conformance tester, providing both functional (for example, next-generation SONET/SDH) and jitter conformance testing in a single product. More information about the Agilent OmniBER OTN is available at Product photos are available at

U.S. Pricing and Availability
The Agilent OmniBER OTN J7231B, ITU-T O.172 Guaranteed Receiver Specification (Option 210), is available now at a price of $12,338. The price of the OmniBER OTN J7231B base unit starts at $181,929.

About Agilent Technologies
Agilent Technologies Inc. (NYSE: A) is a global technology leader in communications, electronics, life sciences and chemical analysis. The company's 28,000 employees serve customers in more than 110 countries. Agilent had net revenue of $6.1 billion in fiscal year 2003. Information about Agilent is available on the Web at

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