Motivation

New transmission technologies, services and facilities are regularly being introduced. Inter-operator links need to be efficiently installed, commissioned, brought into service and maintained. Test and measurement instrumentation is required for the installation, commissioning, bringing into service and maintenance of telecommunications equipment and networks. The measurement of the same parameter made with different measuring instruments should give reliable, repeatable and comparable results. This question needs continuous review to take account of technology changes and improvements of jitter and wander measurement.

The following major Recommendations, in force at the time of approval of this Question, fall under its responsibility:

• O.172, O.173, O.182

Question

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:

• measurement and evaluation of error performance parameters and objectives;
• test instrumentation and techniques associated with various technologies (e.g. SDH, ATM OTN and PNT);
• test instrumentation and techniques associated with the physical layer of optical fibre systems;
• jitter and wander test instrumentation and techniques associated with various technologies (e.g. SDH, ATM OTN and PNT);
• test instrumentation and techniques associated with Optical Phase modulations (ODB, DPSK, and DQPSK).
• keeping O-Series Recommendation up to date.

Tasks

Tasks include, but are not limited to:

• Revision of Recommendation O.182, OTN measurement equipment. Completion date: 2009.
• Revision of Recommendation O.172, SDH jitters and wander measurement equipment. Completion date: 2009.
• Revision of Recommendation O.173, OTN jitter measurement equipment. Completion date: 2009.
• Consider need for new Recommendation on jitter and wander instrumentation for packet-based networks.
• Consider need for new Recommendation on physical layer test instrumentation associated with Optical Phase modulations (ODB, DPSK, and DQPSK).

Relationships

Recommendations:

• G.81X series, G.825, G.783, G.8251, G.826X series, GR 253

Questions:

• Q6/15, Q9/15, Q11/15 and Q13/15

Study Groups:

• ITU-T SG2 on network performance
• ITU-T SG13 on IP and NGN requirements

Standardisation bodies:

• IEC TC86, Optical Interworking Forum (OIF), Internet Engineering Task Force (IETF), IEEE.