rudholm wrote: > ceejay Wrote: > >>Well, at the top end: a 100Mbps LAN should give you about 50Mbps of >>usable throughput, so divide 50,000 by 256 to get 195 theoretical >>streams. > > 50Mbps? > > I'm curious why you don't expect 100Mb/second from your 100Mb/second > Ethernet.
Because Ethernet uses Carrier Sense Multiple Access with Collision Avoidance to control traffic. No Ethernet can deliver its rated speed, even getting 50% of its rated speed is hard if not impossible if there is any sharing of the network. And then you have to add overhead, addressing, error correcting, ack/nak messages, etc. For a practical example for Slim users, a WiFi 'b' network is rated as 11 megabits/second but it rarely can actually delivery uncompressed audio. This is a problem for SB1 users, since the SB1 only does WiFi B, and can't do Flac on the fly The RedBook specifies that stereo music is to be recorded in 16-bit PCM sampled at 44.1 kHz. A little arithmetic shows that the data stream of CD audio must be at least: Data Rate = "X" = 16 bits * 2 channels * 44.1kHz = 16 * 2 * 44100 = 1,411,200 bits/second = 176,400 bytes/second = 172 Kbytes/second So while Red Book (or uncompressed audio) is only 1.4 mb/s and that is only 12% or so of a WiFi "b" link speed, you can't get it. Assuming that you can get 10% of the rated speed is probably good engineering. -- Pat http://www.pfarrell.com/music/slimserver/slimsoftware.html _______________________________________________ discuss mailing list discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss