Steve I think you are overexagerating to make your case...
1-Managed switches verse off the shelf linksys/d-link
is night and day. First off on a typical off
the shelf switch everything is broadcast or multicast.
Every bit of data on the network is exposed to
the entire network(every port). THis limits your
ability to scale past 4-8 ports even in a midley
used home network. In a managed switch, which
is only configured by well trained pros, you are
You can buy switches off the shelf that are unmanaged. If you can install a dumb hub, you can install a unmanaged switch. Netgear, Linksys, D-link, and others all make them. No programming necessary.
2. First off MHz has nothing to do with ethernet.
I beleive you ment to say Mbs or megabits per
second. An uncompressed 24 bit audio stream is
2-3 Mbs. An uncompressed SD video stream is 9-12
Mbs. HD video is more on the line of 20+ Mbs.
Guess what you don't get all 100Mbs out of ethernet,
the head room is more like 50-70 mbs.
First off, audio is generally compressed for most solutions out there. Netstreams will take your compressed audio, and uncompress it. How convenient.
Uncompressed SD video is 4-5Mbs out of a DVD player, but in reality most of the storage systems out there will compress it alot more than that. HD video, also compressed, is max 19Mbs, so you were close on that one.
Therefore if I have a network with a couple computers
browsing or downloading audio, I've got a few
streams of audio running in the house, and say
two feed of video. I have maxed out standard
Level 1 IP switches.
True, so pay an extra $75 at CompUSA and buy the switch instrad of the hub. Joe "DIY" consumer will have figured this out by the time he gets all his C4 gear installed, as well as networked Tivos etc.
Even netstreams( who is
not in error) is selling what is called a level
2 switch with IGMP- It is built by D-link and
runs $550 it also requires sophisticated software
to setup. My tech is testing netstreams digilinx
and is seeing network issues whenever we hook
into a level1 router to ping the web/free db for
the request box. Streams fail and freeze and
delete packet buffers as the network congests.
If you truely understand how a switch works, then I think you would know that there is something else wrong here. The switch should have learned that the traffic between netstream box A and netstream box B is private traffic, and does not need to also go to the port where your level 1 router is. The switch fabric will create a private conversation betyween the Request and the router, as not to disturb the netstream system traffic. Even a crap ass unmanaged switch can handle this. I don't know what netstreams uses as a buffer size, or what IP protocol they are using, but it doesn't sound robust enough to me from what you are saying.
Kaleidescap is running a dedicated level 3 network
and can only do four streams of video. DSS will
have tivo units that are dvr that can sink up
to 4 units on a dedicated network to deliver Q4
as well. There is a reason for this- network congestion.
I would seriously consider the risk of putting
control systems onto an IP network with audio
and video. As I said earlier, it is great for
audio and video and consumers are used to waiting
for a dvd to load, but if I push a button on my
lighting sytem and 3-5 seconds later it comes
on, I don't call that acceptable. Your Thoughts?
I can stream a video (320x240), and two sources of CD quality compressed audio, all coming from the extremely unpredictable internet, and send all that through a level 1 router, and a daisy chained level 1 hub for one segment, and not drop audio or video.
A control packet of some sort is by nature, very small. It does not sit around for 3 to 5 seconds. If it didn't get acknwoledged in milliseconds, it dropped or collided or whatever, and will go again automatically, probably before I even lift my finger from the light switch. Anything short of that is crappy software, not architechural problems.
To put things in perspective, I wait much longer for my dammed compact flouresent bulbs to light up than I would ever wait for an ethernet packet to get through to a controller.
I'm not saying you are completely off base, just that LAN congestion is not some impending doom on the industry the way you make it sound. Demand for bandwith goes up, so network equipment gets faster.
But back on topic to C4....