1 Type of Question

Question intended to lead to a Recommendation.

2 Motivation

MPEG-2 Transport Streams may be subject to degradation in signal quality (particularly jitter/wander) after transport over telecommunication networks. This degradation may be caused by inherent effects of telecommunication networks such as stuffing jitter in PDH networks, stuffing jitter and pointer actions in SDH networks, or cell delay variation in ATM-based networks. In order to ensure reliable limits for these effects on MPEG-2 Transport Streams, enabling safe operation of terminals and equipment at the end of the chain (e.g. modulators for digital television transmitters if using SFN networks), standardized templates for maximum permitted signal deviations are required.

3 Question

• What are the appropriate jitter/wander values for MPEG-Transport Streams demapped from telecommunication networks?
• What parameter tolerances need to be specified?

4 Expected results and anticipated target dates

It is expected that this Question will result in the preparation of a new Recommendation by the end of 2001.

5 Relationships

Liaison with ITU-R Study Group 6 for the definition of tolerance characteristics of equipment receiving the MPEG-TS is required in the study of this Question.