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CSR Volume 12 #22, June 4, 2001 COMMUNICATIONS STANDARDS REVIEW Volume 12, Number 22 June 4, 2001 REPORT OF TR-30.3, DATA COMMUNICATIONS EQUIPMENT EVALUATION AND NETWORK INTERFACES, APRIL 30 – MAY 1, 2001, WILMINGTON, DE The following report represents the view of the reporter and is not the official, authorized minutes of the meeting. TR-30.3, Data Communications Equipment Evaluation and Network Interfaces, April 30 - May 1, 2001, Wilmington, DE..............................................................................................2 Liaisons................................................................................................................................2 PN-3509, Revision of TSB38 (Test Procedures for Evaluating Modem Performance).........2 PN-3857, North American Telephone Network Transmission Model for Evaluating Analog Client and Digitally Connected Server Modems.......................................................4 PN-4254, Network Access Transmission Model for Evaluating xDSL Modem Performance (TIA/EIA 876)..........................................................................................................4 PN-4255, Test Procedures for Evaluating xDSL System Performance.................................4 TR-30.3 Attendance Roster, April 30 – May 1, 2001, Wilmington, DE......................................6 Acronym Definitions........................................................................................................................7 Communications Standards Review Copyright Policy......................................................................8 CSR CDs Provide Additional Resources CSR CDs are machine searchable (Adobe Acrobat) and very useful for reviewing past technical issues as well as providing a base of information for prior-art searches. Your company’s patent or legal departments may also find these CDs useful. Quarterly CDs: 3 months of CSR reports on each CD, in an annual subscription $695 to non-subscribers but only $200 as an add-on to current subscribers Annual CDs: 12 months of CSR reports on a CD for each calendar year 1990 to present $695 to non-subscribers, $200 to current subscribers First Decade CD: all CSR reports from 1990 through 1999 on one CD $2,000 to non-subscribers; subscribers please take a $200 discount for each year of subscription during 1990 – 1999 June 4, 2001 Vol. 12.22 Copyright © CSR 2001 1 COMMUNICATIONS STANDARDS REVIEW REPORT OF TR-30.3, DATA COMMUNICATIONS EQUIPMENT EVALUATION AND NETWORK INTERFACES, APRIL 30 - MAY 1, 2001, WILMINGTON, DE Note: The TR-30.1 and TR-30.2 reports were published in CSR 12.20, May 15, 2001. TR- 30.5 did not meet. J. Douglass (Conexant/Mindspeed) is the TR-30.3 chair. TR-30.3/01-04-028, Report of Meeting #111, St. Petersburg, Florida (March 2001), was accepted with minor changes. TR-30.3/01-04-029 is the Assignment List from the March 2001 TR-30.3 Meeting. TR-30.3/01- 04-029A is the updated Assignment List from this meeting. TR-30.3/01-04-035A is the April 2001 Document Register. TR-30.3/01-04-037 is the TR-30.3 draft Project Status from Communications Standards Summary (published by CSR). Liaisons TR-30.3/01-04-044, Liaison from NRIC V, Focus Group 3 “Wireline Network Spectral Integrity” from E. Eckert (Chairman, NRIC V Focus Group 3), includes the Network Reliability and Interoperability fifth Council (NRIC V) Focus Group 3 status report and recommendations as presented to the Federal Advisory Committee. The purpose of this FCC-chartered committee is to provide recommendations to the FCC and to the telecommunications industry that, when implemented, will assure optimal reliability and interoperability of public telecommunications networks. The recommendations of NRIC V Focus Group 3 support the activities under way in Committee T1, TR-41, DSL Forum and the ITU SG15 Question 4. See <http://www.nric.org> for details of the NRIC. J. Douglass (Conexant/Mindspeed) will send a liaison letter to IEEE 743 Committee to determine if they are interested in having another group revise IEEE 743, Standard Equipment Requirements and Measurement Techniques for Analog Transmission Parameters for Telecommunications. (Editor’s note: CSR 12.14 reported that the IEEE planned to withdraw IEEE-743-1995.) PN-3509, Revision of TSB38 (Test Procedures for Evaluating Modem Performance) Work continued on PN-3509, Test Procedure for Evaluation of 2 Wire 4 kHz Voiceband Duplex Modems (to become TIA/EIA-3800). TR-30.3/01-04-025 is a summary of comments on PN-3509, prepared at the TR-30.3 meeting in St. Petersburg (March, 2001). TR-30.3/01-04-032, PN-3509 Draft 16, was prepared by editors E. Schulz (Agere) and G. Bretting (Compaq). TR-30.3/01-04-030 (G. Bretting, Compaq) is proposed text for PN-3509 section 5.2.4, Throughput over a sustained circuit. TR-30.3/01-04-031, V.92 Test Procedures (W. Henderson, Henderson Labs), provides procedures in eight areas for testing: • Throughput vs. Network Model Coverage (i-model) • Throughput vs. Network Model Coverage (u-model) • PCM Upstream • Call Connect Reliability (CCR) – {and fast connect feature performance} • Modem-on-Hold (MOH) – Functionality / Compatibility 2 Vol. 12.22 Copyright © CSR 2001 June 4, 2001 COMMUNICATIONS STANDARDS REVIEW • Fast Connect • Block Acknowledgement and Character Echo Delay • Procedures specific to V.44, Data Compression TR-30.3/01-04-038, Comments on PN-3509 (A. Torres, Vocal Technologies), provides editorial comments regarding references and table numbers. TR-30.3/01-04-038A includes TR-30.3’s responses to these comments. TR-30.3/01-04-039, V.44 Test Files (W. Henderson, A. Clark, Henderson Labs), proposes modem test files, based on research conducted by A. Clark (Telchemy) with the objective of identifying a set of files that would objectively evaluate lossless compression algorithms. These files were presented as a contribution to ITU Study Group 16 Question 10 and TR-30.1 for use in comparison testing of specific data compression algorithms and to TR-30.3 for use in evaluating transmission products that implement compression schemes. Individual file construction is based on the concept that Internet traffic is a complex construction of diverse content files. TR-30.3 selected a set of application files, including CAD, Database, Facsimile, Graphics, Spreadsheet and Word Processing file types. Included, as well, are files that represent languages other than English. In addition to specifically “Internet-type” files, TR-30.3 submitted for consideration one file from previous evaluation standards. File “4.tst”, a highly non-compressible file, has been part of the testing repertoire for many years and, as noted later in this contribution, serves a unique purpose in product evaluation. The selection of the proposed files was based on evaluating the Entropy and Compression Ratio values for all considered files. TR-30.3/01-04-040, Modem on Hold Test Issues (G. Smock, Rochelle Communications), discusses some of the test issues that relate to the Modem-on-Hold feature of the V.92 standard. It covers the need to simulate and check proper detection of call waiting, CPE Alerting Signal (CAS), and Caller ID signaling by client modems. It asks some questions regarding the client modem’s ability to signal its detection of call waiting and CAS tones. Finally, It discusses two test configurations: A series pass-through configuration allows the use of a tester in conjunction with a telco line or another modem tester. A digital configuration will enable the testing of MOH function with a direct connection to a T1-equipped Remote Access Server (RAS). E. Schulz (Agere) agreed to provide V.92/V.44 client modem code to W. Henderson for PN-3509 V.92 / V.44 modem testing. W. Henderson will perform following tests associated with V.44: • Run proposed V.44 test files on modems with V.44 capability • Compare full V.44 test files to truncated 32 Kbyte V.44 test files • Compare V.42bis performance to V.44 performance • Run V.44 test files on two clients modems with two servers • Draft PN-3509 section on throughput vs. file type • Draft Rationale for test file types W. Henderson (Henderson Labs) will get Calgary Corpus test files from G. Pfeiffer (Telogy Networks). These files will be considered for V.44 testing. E. Schulz (Agere) will provide a new draft of PN-3509. Changes will be based on the following: • Instructions in editor’s notes • Issues list • TR-30.3/01-04-025, Summary of Comments on PN-3509 • Edits made to TR-30.3/01-04-032, Draft 16. • TR-30.3/01-04-038A, Response to VOCAL Technologies comments on PN 3509 June 4, 2001 Vol. 12.22 Copyright © CSR 2001 3 COMMUNICATIONS STANDARDS REVIEW TR-30.3 discussed methods for adding Call Waiting and Caller ID functions using existing lab equipment. J. Douglass (Conexant/Mindspeed) will set up a conference call to discuss PN-3509 on June 14 at 11:00 PDT. PN-3857, North American Telephone Network Transmission Model for Evaluating Analog Client and Digitally Connected Server Modems TR-30.3/01-04-034, Proposed Draft Supplement to T1.403.02 to Add Informative Annex on V.90 Modem Compatibility (P. Dillon, Marconi Communications), provides an informative annex on V.90 modem compatibility (Annex A, V.90 modem compatibility with certain robbed-bit signaling patterns). This contribution is a revision of T1E1.3/2001-009, and contains the changes agreed by working group T1E1.3 at their February meeting. PN-4254, Network Access Transmission Model for Evaluating xDSL Modem Performance (TIA/EIA 876) PN-4255, Test Procedures for Evaluating xDSL System Performance TR-30.3 agreed to review ETSI Permanent TM6 (98)10, Laboratory Performance Tests for xDSL Systems (TR-30.3/01-03-021©, see CSR 12.14) to determine if it can be used as a basis for creating an international version of PN-4254. TR-30.3/01-04-026, Test Loop Scores for xDSL Project (R. Perez, Telcordia), provides statistical results from the Telcordia Loop Survey. The Telcordia Loop Survey was a statistical sampling with a 95% confidence level (i.e., 5% error factor). A total of 1947 loops were randomly obtained and analyzed. The work done for TR-30.3 xDSL project was to extract the non-loaded pairs with a maximum length of 18,500 feet.
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