Digital Subscribe Line

1
Digital Subscribe Line

• By
• Richard Latham

2
POTS and Local Loops

• POTS stands for Plain Old Telephone Service.
• Bandwidth.
• Telephone (300 to 3,400 Hz).
• DSL (4312.5 Hz wide channels starting between
  10,000 and 100,000 Hz).
• Digital, not analog data.

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Different Types

• Asymmetrical DSL (ADSL)
• Very high bit-rate DSL (VDSL)
• Symmetric DSL (SDSL)
• Rate-Adaptive DSL (RADSL)

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Asymmetrical DSL

• ADSL is the type of DSL that favors the idea most
  Internet users download more than they upload.

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Types of ADSL

• CAP
• Voice conversations (0 to 4 kHz)
• Upstream (25 to 160 kHz)
• Downstream (240 kHz to 1.5 MHz)

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Types of ADSL

• DMT
• 247 separate channels.
• Each channel is 4 kHz wide.
• Channel Monitoring and Shifting.

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But Why Filters?

• Low-Pass Filter
• Called LP Filters for short.
• Used for phone if ADSL is installed.
• Block everything above 4 kHz.

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DSL Transceiver

• DSL Transceiver
• Also called a DSL modem.
• Point where the users computer connects to the
  DSL line.
• Connects to computer via USB or 10 base-T
  Ethernet connection.

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DSLAM

• DSLAM will allow users to not see performance
  decrease as new users are added. Here the voice
  component gets separated from the upstream and
  the downstream.

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DSL Network
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Bibliography

• http//en.wikipedia.org/wiki/Asymmetric_Digital_Su
  bscriber_Line
• http//en.wikipedia.org/wiki/dsl
• http//computer.howstuffworks.com/dsl.htm
• http//computer.howstuffworks.com/dsl1.htm
• http//computer.howstuffworks.com/dsl2.htm
• http//computer.howstuffworks.com/dsl3.htm
• http//computer.howstuffworks.com/dsl4.htm
• http//computer.howstuffworks.com/dsl5.htm
• http//computer.howstuffworks.com/dsl6.htm
• http//computer.howstuffworks.com/dsl7.htm
• http//computer.howstuffworks.com/dsl8.htm
• http//computer.howstuffworks.com/dsl9.htm
• Gralla, Preston. How the Internet Works. 7th
  ed. Indianapolis Que, 2004. 328.
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