[opendtv] Re: Can FireWire again save the day?
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 12 May 2006 15:40:14 -0400
Craig Birkmaier wrote:
> The issue is not bandwidth Bert. The issue is the
> ability to establish multiple "channels" of
> isochronous communications across the in-home
> network.
As usually happens, Craig, in your zeal to go in "transmit mode," you
miss the point. The reason channel-based techniques, like ATM, failed to
take over as promised is that you don't need to establish "multiple
channels of isochronous communications" to get effective, time-sensitive
communications. Get it? Not if you have enough excess bandwidth. And if
getting excess bandwidth is cheaper than alternatives, guess what wins?
As I said before, these same arguments occurred a decade ago or more.
Now we have IP telephony over Ethernet or any other link layer. I wonder
how that happened.
> The following paragraph from the EETimes article
> you posted should have told you smething:
>
>> The 1394 Trade Association doesn't agree, nor do HANA
>> promoters. HANA chairman Jack Chaney, the director
>> of the DMS Labs at Samsung, flatly said, "HANA is
>> IP-based and guarantees delivery." Peter Johansson,
>> vice president of Congruent Software Inc. (Bellevue,
>> Wash.), concurred. "Ethernet and Internet Protocol are
>> not one and the same thing. IP is so easy to carry
>> . . . Ethernet carries IP, 1394 carries IP and coax
>> carries IP."
What is it about "we heard these same arguments before" that isn't
clear, Craig? Read again why these arguments don't hold water. I won't
repeat myself.
By the way, in special circumstances such as in production facilties,
you may very well want to use special purpose link layer techniques. And
in those cases, any IP layering will be basically unused, if it even
exists. You would want to avoid any sort of "IP routing," to retain your
synchronous behavior, which makes the IP layer superfluous. Or you can
ballyhoo the use of "IP" just for the sake of mindless hype.
Bert
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
Other related posts: