ITU--T Telecommunication Standardization Sectorhfill Document AVC--876 
Study Group 15hfill January 10, 1996
Experts Group for Video Coding and Systems
in ATM and Other Network Environment

SOURCE    : Japan
TITLE     : Common Bitrate for H.310 Terminals
PURPOSE   : Proposal

1. Introduction

This document proposes that the two common bitrate of 6.xyz Mbit/sec
and 9.abc Mbit/sec that were defined at Yokosuka Meeting (Oct. 1995)
to be 6.144Mbit/sec and 9.216Mbit/sec, respectively.

2. Background

Our previous document AVC--839, `Common Bitrate for H.310 Terminals',
Oct. 1995, discussed the necessity of defining a single or a set of
common bitrate for H.310 terminals.

At Yokosuka Meeting, it was agreed that there shall be two common
bitrate, measured at AAL-SAP, and that the bitarate shall be 6.xyz
Mbit/sec and 9.abc Mbit/sec, both mutually in simple relationship.

In this document, we propose two specific bitrate that are to be
common bitrate.

3. Discussions

We first assume that 9.abc Mbit/sec should be 3/2 times
6.xyz Mbit/sec, because this combination gives the most
simple relationsip.

Then, there there shall be the following candidates for
the bitrate of 6.xyz Mbit/sec;

 94 * 64kbit/sec =6.016 Mbit/sec,  96 * 64kbit/sec =6.144 Mbit/sec,
 98 * 64kbit/sec =6.272 Mbit/sec, 100 * 64kbit/sec =6.400 Mbit/sec,
102 * 64kbit/sec =6.528 Mbit/sec, 104 * 64kbit/sec =6.656 Mbit/sec,

and among them, the number 96 (=2*2*2*2*2*3) has the largest
number of divisors.

Finally, the bitrate of 9.abc Mbit/sec shall be 9.216Mbit/sec
(=(3/2)*96*64kbit/sec).

7. Conclusion

This document proposes that the two common bitrate
shall be 6.144Mbit/sec and 9.216Mbit/sec, respectively.

END