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To: MikeM54321 who wrote (362)	7/8/2000 4:49:22 PM
From: ftth	Read Replies (1) \| Respond to of 46821

Unless your P-MP is one hop away, there will always be portions of the P-MP route that are P-P. It is in those portions where you get the bandwidth conservation, providing the stream is tagged and set up as multicast. There are a number of ways I can think of to get the P-MP effect w/ optical wireless. One way where a P-P system could be used as P-MP without the outer network itself needing to be P-MP is, within a building, there could perhaps be just one central receive point, and the multipoint fanout could take place internally via their wired infrastructure. This would of course require the central receive point to know that this particular stream is to be multicast locally. It seems to me that in general, for businesses that need multicast, the multipoint fanout would be a static set of routes that seldom if ever changes. You probably wouldn't want your multicast going to "others" but your business may span several buildings or several non-adjacent floors. Still, these remain static once known. Reprovisioning for growth of your business doesn't need to be instantaneous, and once this is done it's static again. A pretty good introduction to multicast is: www1.fatbrain.com