Dear Mr. Harasaki, Mr. Okubo, and other Q.12/16 experts,
Sorry I could not get back to you earlier. Business trip and works have kept me very busy. Now I am on vacation and I finally got chance to go over the H.bmultipoint drift. I have several questions/comments listed below:
1. On page 9, Figure 3, blockdiagram of a Multipoint Control Unit, 1a) Does MC talk to MR too? There is no connection between the two in the diagram. 1b) Should Call Control function be distributed between MC and Network Interface? 1c) There should have multiple inputs/outputs to/from Audio Processing Unit, Video Processing Unit, and Data Processing unit.
2. By checking Chapter 5 and Chapter 7, I could not tell the difference. I understand you want Chapter 5 to be a general system description while chapter 7 to be MCU specifics. But if H.bmultipoint only deal with multipoint with MCU, there is no difference between the two. Or the two chapters should be merged into one because the general system is MCU.
3. In general, multipoint includes multipoint with MCU (centralized) and multipoint without MCU (distributed). If Chapter 5 includes configuration on multipoint without MCU, then there is difference between Chapter 5 and 7, where Chapter 5 is a general system and Chapter 7 is multipoint with MCU. We can make multipoint without MCU for further study since we agreed on Sunriver meeting that we would focus on tightly-coupled multipoint with MCU. In my mind, Chapter 5 can be like 5.1 MC 5.2 MP 5.3 MR 5.4 MCU 5.5 Multipoint configurations 5.5.1 Multipoint without MCU (Text can be found in F.702) 5.5.2 Multipoint with MCU (Text can be found in F.702) *** Four types of VC connection configurations for Centralized MCU. ( Should this be moved to Chapter 7 ??)
Chapter 7: (7.x: VC connection configurations for MCU??) 7.1, 7.2, 7.3 More detailed description about MC, MP, and MR? 7.4 Clock synchronization 7.5 MCU-MCU interconnections---- This should include diagrams to show multi-MCU configurations (from H.231 or F.702)
4. On 5.6, we only listed four H.245 commands/procedures. I think we need more to support multipoint. Should we list they all or we are not really sure what we really want?
5. I like the break up between the basic procedure and advanced procedures. But do they still belong to Chapter 6?
Hope these will not be too late or cause too much confusion. Thanks.
Li
lyan@lucent.com Lucent Technologies