Re: You forgot about videophones (useful for the deaf among us)! (was: Re: adsl)
On Mon, Dec 18, 2000, Omer Zak wrote about "You forgot about videophones (useful for the deaf among us)! (was: Re: adsl)": VIDEOPHONES! VIDEOPHONES!! VIDEOPHONES!!! VIDEOPHONES They need at least 384Kbps in each direction to provide high quality pictures. Correct me if I'm wrong, but doesn't *DSL technology allows for a fixed *total* bandwidth, and it is up to the implementation to decide how much bandwidth it reserves for each direction? The 64kbps choice was probably made because typical users don't send much upstream (forget about videophones for a moment...) and reserving, say 500mbps for upstream will mean that most of that bandwidth will be wasted. So why can't Bezek give some of the users DSL lines with a different bandwidth division? Please correct me if I have made wrong assumptions. There may be a more sinister explanation for the asymetric nature of ADSL: typical users will not sit by the computer 24/7 downloading stuff. However, if their computer is connected all the time, it's easy to set up a server that serves files 24/7, potentially using huge amounts of bandwidth. So by limiting the upstream bandwidth, they limit the amount of bandwidth you can se up! And another question? I know that videophones over ISDN exist for many years now. Does that mean that 128kbps is maybe enough for a videophone? Or does that mean the image will be too small or too fuzzy to read lips, or something? -- Nadav Har'El| Monday, Dec 18 2000, 21 Kislev 5761 [EMAIL PROTECTED] |- Phone: +972-53-245868, ICQ 13349191 |Take my advice, I don't use it anyway. http://nadav.harel.org.il | = To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: You forgot about videophones (useful for the deaf among us)! (was: Re: adsl)
- Original Message - From: "Nadav Har'El" [EMAIL PROTECTED] Correct me if I'm wrong, but doesn't *DSL technology allows for a fixed *total* bandwidth, and it is up to the implementation to decide how much bandwidth it reserves for each direction? The 64kbps choice was probably made because typical users don't send much upstream (forget about videophones for a moment...) and reserving, say 500mbps for upstream will mean that most of that bandwidth will be wasted. So why can't Bezek give some of the users DSL lines with a different bandwidth division? Please correct me if I have made wrong assumptions. You are wrong (sorry). ADSL is completly asynchronous (that's what the A stands for). Oded .. Geoffrey : "I have a feeling this is going to be the beginning of a beautiful hatred." -- from "The Two Mrs. Carrolls" = To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: You forgot about videophones (useful for the deaf among us)! (was: Re: adsl)
On Mon, Dec 18, 2000, Oded Arbel wrote about "Re: You forgot about videophones (useful for the deaf among us)! (was: Re: adsl)": - Original Message - You are wrong (sorry). ADSL is completly asynchronous (that's what the A stands for). I'm sorry, but you got it wrong yourself... the "A" stands for Asymmetric, not asynchronous (you probably confused it with the A in ATM. Well, at least didn't confuse it with the A in Hawthorne's "The Scarlet Letter" :)) I don't know what you mean that ADSL is "asynchronous". So what? Can't it still split up the frequency range in an asymmetric way between the two directions, giving more frequencies to the downstream range? Anyway, I believe that ADSL is synchronous, not asynchronous... Take a look for example at http://www.adsl.com/adsl_tutorial.html -- Nadav Har'El| Monday, Dec 18 2000, 21 Kislev 5761 [EMAIL PROTECTED] |- Phone: +972-53-245868, ICQ 13349191 |Cigarette: tobacco wrapped in paper, http://nadav.harel.org.il |fire at one end, and a fool at the other. = To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: You forgot about videophones (useful for the deaf among us)! (was: Re: adsl)
Nadav Har'El wrote: On Mon, Dec 18, 2000, Omer Zak wrote about "You forgot about videophones (useful for the deaf among us)! (was: Re: adsl)": VIDEOPHONES! VIDEOPHONES!! VIDEOPHONES!!! VIDEOPHONES They need at least 384Kbps in each direction to provide high quality pictures. And another question? I know that videophones over ISDN exist for many years now. Does that mean that 128kbps is maybe enough for a videophone? Or does that mean the image will be too small or too fuzzy to read lips, or something? We have an ISDN (128k) videophone at work. Usually we supplement the video with a regular audio call on a speakerphone. If the camera is focused on the persons lips and they s-p-e-a-k--s-l-o-w-l-y you might be able to read their lips, but don't expect to watch a speaker at a podium and do it. The image being digital is always sharp and clear (depending upon the focus of the camera). If the viewing are is too big, or the action too fast (such as a fast pan around the room), it just becomes jerky.. ... Geoff. -- Geoffrey S. Mendelson Tel: 972-(0)3-6944-211 Fax: 972-(0)3-6944-225 Email: [EMAIL PROTECTED] I knew that Crowley said that "Do what thou wilt is the whole of the law", but I never thought it applied to the US Supreme Court. = To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
