Question 4/4 - Test and measurement techniques and instrumentation for use on telecommunications systems and their constituent parts
(Continuation of Question 4/4 (2001-2004) in a revised version)
- Test and measurement instrumentation is required for the installation, commissioning, bringing
into service and maintenance of telecommunications equipment and networks;
- measurement of the same parameter made with different measuring instruments should give reliable, repeatable and comparable results;
- new transmission technologies, services and facilities are regularly being introduced;
- network operators desire to maximize efficiency by use of automated test systems, wherever possible;
- inter-operator links need to be efficiently installed, commissioned, brought into service and maintained;
- circuits may be provided using analogue, digital and mixed analogue and digital technologies.
- maintenance of the O.series Recommendations, except the O.17x Recommendations on jitter and wander measurement
Study items to be considered include, but are not limited to:
What manual and automatic test and measurement instrumentation and techniques to assess transmission performance need to be specified by ITU-T, and what should be the specifications?
The following are examples of instrumentation and techniques which may be studied:
Lower network layers
- Measurement and evaluation of error performance parameters and objectives;
- test instrumentation and techniques associated with various technologies (e.g. SDH, ATM and OTN);
- test instrumentation and techniques associated with the physical layer of optical fibre systems;
- test instrumentation and techniques to assess end-to-end transmission performance;
- test instrumentation and techniques to assess performance of digital leased lines;
- test instrumentation and techniques associated with transmission of digital/digital compressed video relating, e.g., to broadband and cable TV networks;
- test access lines;
- test instrumentation and techniques to assess performance of digital subscriber lines (xDSL technology);
- test instrumentation and techniques to assess performance of WDM, DWDM and CWDM transmission systems.
Higher network layers
- Test instrumentation and techniques associated with broadband ISDN and ATM;
- test instrumentation and techniques associated with Common Channel Signalling
System No. 7;
- test instrumentation and techniques associated with the TMN;
- test instrumentation and techniques (including delay) associated with IP-based networks;
- General issues related to test instrumentation and techniques;
- Keeping O-Series Recommendations up to date.
The expected results of the work are amendments to existing Recommendations or new Recommendations in the O-series.
Note: Recommendation O.191 was adopted in January 2000. The necessity to produce a revised
version of this Recommendation needs to be established before further work is done.
Tasks include, but are not limited to:
- Revision of Recommendation O.191. Need for revision to be established.
- Development of a new Recommendation O.iptest for test instrumentation to assess performance
of transmission systems supporting IP. Completion date: 2005
- Development of a new Recommendation O.otn for test instrumentation to assess performance of optical transmission systems (OTN). Completion date: 2005
Coordination will be necessary with other Working Parties in ITU-T Study Group 4.
Depending on the subject of the work, coordination may be necessary with other ITU-T Study Groups, e.g. Study Groups 9, 11, 12, 13, 15 and 17.
Other bodies: ATM Forum, Optical Interworking Forum (OIF), Internet Engineering Task Force