Digital Subscriber Line

1
Digital Subscriber Line

• Sean Moran
• Tony Nowak
• Drew Van Norman
• Ed Wilbert

2
Agenda

• Definition
• How Does it work
• Advantages
• Disadvantage
• Comparisons
• Decision
• Conclusion

3
Digital Subscriber LineDefinition

• Digital Subscriber Line (DSL) technology is a
  modem technology that uses existing twisted-pair
  telephone lines to transport high-bandwidth data,
  such as multimedia and video, to service
  subscribers.

Source http//www.cisco.com/univercd/cc/td/doc/ci
sintwk/ito_doc/dsl.htm
4
How does it work?

• Uses available capacity (bandwidth) of twisted
  wire copper phone lines
• Voice less than 4000 Hz
• Data higher than 4000 Hz
• ADSL 25 kHz 1100 kHz
• Customer DSL Transceiver (DSL modem)
• Provider DSL Access Multiplexer (DSLAM)

Source http//www.dsllife.com/dsltut.htm http//
computer.howstuffworks.com/dsl3.htm
5
Advantages

• Uses existing twisted pair copper wire for
  transmission
• Always on
• High bandwidth with small changes to existing
  telecommunications infrastructure
• Allows simultaneous use of telephone
• Not the same as voice over IP

Source http//www.cisco.com/univercd/cc/td/doc/ci
sintwk/ito_doc/dsl.htm http//www.dsllife.com/dsl
tut.htm
6
Limitations

• Length of the copper line between customer and
  central office
• 18,000 feet maximum
• Uses existing twisted pair copper wire for
  transmission
• High bandwidth with small changes to existing
  telecommunications infrastructure

Source http//www.cisco.com/univercd/cc/td/doc/ci
sintwk/ito_doc/dsl.htm http//www.dsllife.com/dsl
tut.htm
7
Comparison - 1

• Provider of high speed internet service
  independent of phone service.
• Features Downstream speed Up to 1.5Mbps
• Upstream speed Up to 128kbps
• 8 personal email addresses
• 10 MB of personal Web space per
  address
• Price Monthly Rate - 49.95
• Standard activation fee - 99.00
• Web site Black text on white background
• Large amount of descriptive information
• Limited time offers and free for XX days

Source http//www.earthlink.net
8
Comparison - 2

• Provider of high speed internet service
  in-connection with phone service.
• Features 256kbps or 768kps access plans
• 4 personal email addresses
• 5 MB of personal web space per address
• 200 local calls with 60 minutes long
  distance
• Price Monthly Rate - 53.00 (24 month)
• Standard activation fee - Free
• Web site White text on bold solid colored
  background
• Controlled amount of descriptive
  information
• Straight forward pricing , two options
  available

Source http//www.tdsmetro.com
9
Comparison - 3

• Provider of high speed internet service
  independent of phone service.
• Features 128Kbps - 768Kbps access speeds
• 9 personal e-mail addresses
• 10 MB of personal web space per address
• 30 day money back guarantee
• Price Monthly Rate - 29.95 (6 month online
  promotion)
• Standard activation fee - ??
• Web site Black text on white background
• Relatively easy to navigate
• Cannot find standard monthly cost of
  service

Source http//www22.verizon.com
10
Comparison - 4

• Provider of high speed internet service
  independent of phone service.
• Features 348kbps, 768kps,or 1.5Mbps access
  plans
• 10 personal e-mail addresses
• 10 MB of personal web space per address
• Yahoo Classifieds, Auctions,Consumer
  Reports
• Price Rate - 39.95 (12 month)
• Standard activation fee - ??
• Web site White text on bold solid colored
  background
• Informative and relative easy to navigate
• Extra steps to get package pricing

Source http//www.sbc.com
11
Decision

• TDS Metrocom
• Factors
• Price
• Voice data service
• Regional provider
• Web site
• (straight forward)

• SBC
• Factors
• Price
• Yahoo! DSL browser
• Several Plans
• Web site
• (informative
  navigational)

12
Conclusion

• Viable option for high speed internet access
• Uses existing phone lines
• Requires ADSL modem
• Limited by physical location
• Multiple providers available on market
• Phone service option
• Varied plans and options
• Competitively priced