SI
SI
discoversearch

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor.  We ask that you disable ad blocking while on Silicon Investor in the best interests of our community.  If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.
Microcap & Penny Stocks : International Automated Systems
IAUS 0.04000.0%Jul 8 5:00 PM EST
 Public ReplyPrvt ReplyMark as Last ReadFilePrevious 10Next 10PreviousNext  
To: Skeeter Bug who wrote (1244)6/4/1998 12:08:00 PM
From: paulmcg0  Read Replies (1) of 7618
 
DSL runs over conventional copper phone lines, typically at T-1 speeds (1.5 Mbps). Unlike cable modem, you get all the bandwidth to yourself and don't share it with others. ADSL is asymmetric -- you get 1.5 Mbps towards you, and perhaps 100 Kbps going the other direction back to the phone company.

I'll let you in on a little phone industry secret -- DSL has been available for some time, but the phone companies used it for their own internal use, and didn't make it available to the public. Pacific Bell has an equipment box in front of my office that services the surrounding businesses. They digitize and multiplex voice circuits in that box, so they don't have to lay a lot of cable. For example, they use symmetric DSL, which gives you 768 Kbps in both directions. Using the DSL cards in their equipment box, they can digitize 12 phone calls and carry them over one copper wire pair, that would normally only carry one voice call) to the central office. The equipment they used was made by PairGain ( pairgain.com )

Another piece of telecom trivia -- you might start to hear a lot about WDM -- this is -not- DWM, but wave division multiplexing, a way of increasing the capacity of fiber optics to speeds in the many gigabit range (much greater than 1 billion bits per second). Researchers at IBM (if I recall) did a an experimental test where they achieved over a terabit of data per second (1000 billion bits per second) using WDM and fiber optics.
Report TOU ViolationShare This Post
 Public ReplyPrvt ReplyMark as Last ReadFilePrevious 10Next 10PreviousNext  

HomeMailHotSubjectMarksPeopleMarksKeepersSettings
Terms Of UseContact UsCopyright/IP PolicyPrivacy PolicyAbout UsFAQAdvertise on SI
© 2025 Knight Sac Media.  Data provided by Twelve Data, Alpha Vantage, and CityFALCON News