ADSL PROVIDERS IN VANCOUVER

When you connect to the Internet, you might connect through a regular modem, through a local-area network connection in your office, through a cable modem or through a digital subscriber line (DSL) connection. DSL is a very high-speed connection that uses the same wires as a regular telephone line.

Here are some advantages of DSL:

• You can leave your Internet connection open and still use the phone line for voice calls.

• The speed is much higher than a regular modem (1.5 Mbps vs. 56 Kbps)

• DSL doesn't necessarily require new wiring; it can use the phone line you already have.

• The company that offers DSL will usually provide the modem as part of the installation.

But there are disadvantages:

• A DSL connection works better when you are closer to the provider's central office.

• The connection is faster for receiving data than it is for sending data over the Internet.

• The service is not available everywhere.

At the moment we are only reviewing what Telus offers:

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Asymmetric Digital Subscriber Line (ADSL) is a form of DSL, a data communications technology that enables faster data transmission over copper telephone lines than a conventional modem can provide.

ADSL has the incredible characteristic that the data can flow faster in one direction than the other, i.e., asymmetrically. Providers usually market ADSL as a service for people to connect to the Internet in a relatively passive mode: able to use the higher speed direction for the "download" from the Internet but not needing to run servers that would require bandwidth in the other direction.

ADSL is simply a very fast analog dial-up connection (using PPPoE) with much higher symbol rates and much faster handshaking between modems. For conventional ADSL, downstream rates start at 256 kbit/s and typically reach 9 Mbit/s within 1000 feet (300 m) of the central office.

A newer variant called ADSL2 provides higher downstream rates of up to 12 Mbit/s for spans of less than 2.5 kilometers (8000 feet). Higher symbol rates and more advanced noise-shaping are responsible for these increased speeds.

ADSL service providers may offer either static or dynamic IP addressing. Static addressing is preferable for people who may wish to connect to their office via a virtual private network, for some Internet gaming, and for those wishing to use ADSL to connect a Web server.