Question 28/XV - Characteristics of new multiplexing equipment for the
digital hierarchy as given in Recommendation G.702

Considering

(1) that there are needs from subscribers and network operators for new
facilities and interfaces;

(2) that CCITT Recommendations on the G.730, G.740 and G.750-series for
PCM, ADPCM and digital multiplexing equipment are well established;

(3) that it is likely that new types of multiplexing equipment will be
developed which do not come within the scope of these existing
Recommendations, nor within the scope of Questions 19/XV and 17/XV,

1. What characteristics should be recommended for new multiplexing
equipment which uses low bit rate encoding techniques?
2. What characteristics should be recommended for other types of new
multiplexing equipment for the digital hierarchy as given in
Recommendation G.702?

Points for study

1.Characteristics of transmission interfaces.

2. Maintenance aspects.

3.Applications of Operations, Administration and Maintenance interfaces
as given in Recommendation G.771 - any unique features required.

4.Information and control signals that may need to be passed between
multiplexing equipment of this type and a TMN.

Notes

1. Study of Operations, Administration and Maintenance interfaces on
transmission equipment is carried out under Question 9/XV.

2. Study of this Question should be coordinated with the study of
Question 18/XV.

3.Equipment for use in the local network is studied in Question 17/XV.

4. The mapping of 1544 kbit/s signals within a 2048 kbit/s signal is
given in Recommendation G.802. However no corresponding equipment has
been recommended.