1-Meg Modem

From Wikipedia, the free encyclopedia
  (Redirected from 1 Mbit/s modem)
Jump to: navigation, search

The 1-Meg Modem in telecommunications was[1] a DSL modem created by Nortel which conforms to the ADSL Lite standard.[2] The 1-Meg Modem was the first xDSL modem to gain approval and registration under FCC Part 68 Rules.[3]

Technical details[edit]

The 1-Meg Modem can be deployed up to 18,000 feet (5,500 m) from the central office providing a downstream bit rate of 960 kilobits per second (kbit/s) and a maximum upstream rate of 120 kbit/s over 24 gauge wire. The second generation could achieve a transfer rate of 1280 kbit/s downstream and 320 kbit/s upstream.[4] Unlike most ADSL modems which use Asynchronous Transfer Mode (ATM) virtual circuits to carry data, the 1-Meg Modem used Ethernet which makes the product easy for most residential users to install themselves but ill suited for applications that require quality of service to be enforced. At the telephone company switch the installation was relatively simple when the switch was a Nortel DMS Switch.[5] The customer's line card must be swapped with a line card that supported the 1-Meg Modem and also a card must be added to the drawer that would manage all data from the 1-Meg Modem cards in the drawer.

History[edit]

At the time the modem was released[when?] telephone companies were fearing competition from cable modems. However, early DSL technology was too costly for wide deployment. By October 1998 Nortel claimed more than $1 billion in sales which, in their words, had "the potential for more than one million end-user lines."[6] The modems were originally tested at Northern Illinois University dormitories and worked well even though the school's wiring was relatively old.[7][8]

References[edit]

  1. ^ "1 Meg Modem End of Life". Archived from the original on April 25, 2009. Retrieved April 20, 2009. 
  2. ^ "Highspeed Alternatives—DSL". ModemHelp.Org. Archived from the original on July 18, 2006. Retrieved August 6, 2006. 
  3. ^ NORTEL NETWORKS: Nortel Networks' 1-Meg Modem re receives FCC Part 68 Rules approval and registration
  4. ^ "Nortel 1-Meg Modem: Next Generation Data Access" (PDF). Nortel Networks. July 1998. Archived from the original on May 3, 2006. Retrieved June 23, 2006. 
  5. ^ LaBarba, Liane H. (April 9, 2001). "DSL Breaks the Rural Barrier". Telephony Online. Retrieved August 6, 2006. 
  6. ^ "Nortel Networks Expands 1-Meg Modem CPE Portfolio" (Press release). Nortel Networks. October 21, 1998. Retrieved October 18, 2006. 
  7. ^ Carter, Wayne (October 20, 1997). "Nortel fills gap between analog, DSL: New 1-Meg Modem promises affordable high-speed access". Telephony Online. Retrieved August 6, 2006. 
  8. ^ Austen, Ian (April 30, 1998). "Modem 'Lite' Offers Fast Web Access at Low Rates". The New York Times. Retrieved May 23, 2008. 

External links[edit]