19 megabits on an unloaded cable modem node is quite practical, especially for brief speed tests.The U.S. cable modem architecture is based around nodes that share 35 megabits or so downstream. RCN even sells a 20 megabit service, which David Reed buys and reports gives him the promised 20 megabits most of the time. In practice, most nodes run with 5-10 megabits typical load, as only a fraction of the time multiple users on one node simultaneously download megabits and fill the pipe. Statistical multiplexing (sharing) works much better than people expect on cable modem networks, especially on well managed nets that split nodes and otherwise expand capacity when needed because a node gets frequently congested.
Comcast and cable suppliers are working on several techniques to allow customers to get more than the 6 or 8 meg typically allocated, while not causing undue congestion. "Speed burst" technology tests the network load, and if uncongested temporarily raises the speed of an individual modem making a fast download for a brief period. While that's marketed as "doubling" speeds to 12 and 16 megabits, bursts to 20 and 25 megabits are also practical.
The new technologies require upgraded equipment and are typically being tested first and then rolled out market by market. So it would be no surprise if a subscriber in Philadelphia (Comcast's home town) is benefiting from a test or early deployment of faster speeds than Comcast customers elsewhere.
100 megabit+ (shared) cable modems are being deployed in Japan, Quebec, and France, bonding 3 or 4 35 megabit channels for higher speeds. These are early "DOCSIS 3.0" products, unlikely to be widely deployed in the U.S. until 2009. Comcast's CEO, Brian Roberts, demonstrated 100 megabits at the cable show in Las Vegas this spring, and will probably test widely in 2008 and go into deployment (especially where Verizon is building FIOS) the following year. DOCSIS 3.0 requires a new cable modem unit, however, so this customer is unlikely to be an early tester.
That doesn't explain why the test to San Francisco only ran at 4 megabits, which could be explained by node congestion a few minutes later, inferior Comcast backbone connections to Speakeasy's host in San Francisco, or other circumstances.
For more details on coming faster cable modems, google DOCSIS 3.0.
I look forward to Apple's website reflecting Raskin's role more fully, perhaps reflecting some of the excellent material at Digibarn, including Jef's original review of the project in 1981.
But the slowness of a Sunday response on the website should not be taken as evidence of lack of respect. After hearing that Jef also had pancreatic cancer, Steve Jobs reached out directly to him privately. The battles of twenty years ago do not need to still be re-fought; far more interesting is to support the Archy project, which Jef in his last days was trying to get to an alpha release.
It would be a fitting tribute for Apple to step in with support, and incorporating some of Jef's recent work would make the Mac a much more efficient machine for many kinds of work.
Time to coome together, and support and extend Jef's work as a tribute.
db
From Linda Blum, his wife, comes this note:
Dear Friends,
Jef died this evening, surrounded by friends and family, with some favorite music playing. While I am overcome by a profound sense of sadness and am not looking forward the days, weeks and years ahead without him, I am also relieved that he did not suffer for a long time and that he is at peace and no longer in pain. There will be a memorial service, time and date to be determined.
-----------
My first thoughts:
We lost one of the great ones today, a good and generous man.
Jef Raskin died of cancer this evening, after being sick for several months. A wonderful spirit and renaissance man, who inspired me and many others. He created the Macintosh project at Apple in 1979, naming it after his personal favorite fruit He left Apple to form Information Appliances, where he designed the Canon Cat with an innovative interface. He continued refining human interface design, publishing his ideas in The Humane Interface (Addison Wesley, 2000.) The Humane Interface ideas are being implemented in the Raskin Center project Archy, where is son, Aza, is a programmer.
His artwork was displayed at New York's Museum of Modern Art. He conducted the San Francisco Chamber Opera Society and wrote the score for a movie, "Smog Patterns," shown on PBS. He has a patent for a "Construction Technique for an Airplane Wing," and was a noted model airplane designer, an accomplished archer, and an occasional race car driver.
Website is http://jef.raskincenter.org/home/index.html.There is also a collection of photographs and history at http://www.digibarn.com/friends/jef-raskin/index.h tml Jennie Bourne and I are in the midst of making a movie about him http://www.jefthemovie.com .
Slashdot Mirror
Comcast and cable suppliers are working on several techniques to allow customers to get more than the 6 or 8 meg typically allocated, while not causing undue congestion. "Speed burst" technology tests the network load, and if uncongested temporarily raises the speed of an individual modem making a fast download for a brief period. While that's marketed as "doubling" speeds to 12 and 16 megabits, bursts to 20 and 25 megabits are also practical.
The new technologies require upgraded equipment and are typically being tested first and then rolled out market by market. So it would be no surprise if a subscriber in Philadelphia (Comcast's home town) is benefiting from a test or early deployment of faster speeds than Comcast customers elsewhere.
100 megabit+ (shared) cable modems are being deployed in Japan, Quebec, and France, bonding 3 or 4 35 megabit channels for higher speeds. These are early "DOCSIS 3.0" products, unlikely to be widely deployed in the U.S. until 2009. Comcast's CEO, Brian Roberts, demonstrated 100 megabits at the cable show in Las Vegas this spring, and will probably test widely in 2008 and go into deployment (especially where Verizon is building FIOS) the following year. DOCSIS 3.0 requires a new cable modem unit, however, so this customer is unlikely to be an early tester.
That doesn't explain why the test to San Francisco only ran at 4 megabits, which could be explained by node congestion a few minutes later, inferior Comcast backbone connections to Speakeasy's host in San Francisco, or other circumstances. For more details on coming faster cable modems, google DOCSIS 3.0.
Dave Burstein
Editor, DSL Prime
I look forward to Apple's website reflecting Raskin's role more fully, perhaps reflecting some of the excellent material at Digibarn, including Jef's original review of the project in 1981. But the slowness of a Sunday response on the website should not be taken as evidence of lack of respect. After hearing that Jef also had pancreatic cancer, Steve Jobs reached out directly to him privately. The battles of twenty years ago do not need to still be re-fought; far more interesting is to support the Archy project, which Jef in his last days was trying to get to an alpha release. It would be a fitting tribute for Apple to step in with support, and incorporating some of Jef's recent work would make the Mac a much more efficient machine for many kinds of work. Time to coome together, and support and extend Jef's work as a tribute. db
From Linda Blum, his wife, comes this note: Dear Friends, Jef died this evening, surrounded by friends and family, with some favorite music playing. While I am overcome by a profound sense of sadness and am not looking forward the days, weeks and years ahead without him, I am also relieved that he did not suffer for a long time and that he is at peace and no longer in pain. There will be a memorial service, time and date to be determined. ----------- My first thoughts: We lost one of the great ones today, a good and generous man. Jef Raskin died of cancer this evening, after being sick for several months. A wonderful spirit and renaissance man, who inspired me and many others. He created the Macintosh project at Apple in 1979, naming it after his personal favorite fruit He left Apple to form Information Appliances, where he designed the Canon Cat with an innovative interface. He continued refining human interface design, publishing his ideas in The Humane Interface (Addison Wesley, 2000.) The Humane Interface ideas are being implemented in the Raskin Center project Archy, where is son, Aza, is a programmer. His artwork was displayed at New York's Museum of Modern Art. He conducted the San Francisco Chamber Opera Society and wrote the score for a movie, "Smog Patterns," shown on PBS. He has a patent for a "Construction Technique for an Airplane Wing," and was a noted model airplane designer, an accomplished archer, and an occasional race car driver. Website is http://jef.raskincenter.org/home/index.html .There is also a collection of photographs and history at http://www.digibarn.com/friends/jef-raskin/index.h tml Jennie Bourne and I are in the midst of making a movie about him http://www.jefthemovie.com .