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All FAQs » UK Broadband FAQ » 2. ADSL

FAQ RevisionsEditor: laffalot See Profile
Last modified on 2007-11-24 07:24:22
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2. ADSL

·What Is ADSL?
·What Tests Are Carried Out On My Line?
·Can I Carry Out Any of the Line Tests?
·My line has DACS.
·What is the Difference Between an Engineer and a Wires-Only Install?
·Can I Share My ADSL Connection?
·How can I tell if my ADSL line is activated?

What Is ADSL? (#5113)
ADSL stands for Asymmetric Digital Subscriber Line. It is a broadband connection technology, which uses the existing copper wired telephone networks. ADSL offers much higher speeds than the standard 56k modem – anything between 10 and 40 times faster – depending on your connection speed.

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by laffalot See Profile
last modified: 2002-09-09 06:15:49

What Tests Are Carried Out On My Line? (#5114)
Before you can get the ADSL service a series of tests have to be carried out on your phone line. This is done to ensure that it is able to cope with the service.

The Following tests are carried out:

    •Phone Line Length
    This is carried out to see how far your phone line is from your nearest telephone exchange. You must be within 3.5km to pass for 1Mbps and 2Mbps products, and within 5.5km for the 512kbps products.

    •Line Loss
    This is carried out to ensure your telephone line is suitable for ADSL. The test checks the quality of your telephone line. To pass you need less than 41dB to pass.

    •Capacitance
    This is also another test carried out to test the quality of your telephone line. To pass you need less than 160nf.

For those getting an engineer installed product there is one more additional test that is carried out:
    •Whoosh Test
    The test looks at the quality of the line across the DSL frequency range and measures how much of the signal reaches your house.


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by laffalot See Profile
last modified: 2002-10-11 06:08:43

Can I Carry Out Any of the Line Tests? (#5130)
I'm afraid this is no longer possible as a pin is required to be entered before it allows you to progress.

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by laffalot See Profile
last modified: 2007-11-24 07:24:22

My line has DACS. (#5115)
DACS is a device that BT use to share a pair of copper wires between two phone lines. If your line has DACS you have to have it removed from the line by BT before you can get an ADSL service.

The procedure to do this is to apply for an ADSL service through your chosen ISP. During the tests carried out on your line they should spot the DACS and arrange for the removal of the device. This will result in a delay in your ADSL order as an engineer has to carry out some work to remove the DACS. Once it is removed you should be able to get your ADSL service all depending on your line passing the other line tests.

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by laffalot See Profile
last modified: 2002-09-28 00:36:38

What is the Difference Between an Engineer and a Wires-Only Install? (#5116)
Prior to the wires-only installation method a BT engineer had to visit your home to add a splitter to your BT master socket. The splitter separates the frequencies used for the ADSL and the phone.

Wires-only is a self-install method and became available in 2002. A wires-only installation means an engineer is not required to visit you to install the ADSL service. This is because you install simple micro-filters – which work in the same way as the BT installed splitter socket - to your phone sockets.

You can still decide on which type of installation you would like, however the engineer method is far more expensive.

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by laffalot See Profile
last modified: 2002-09-09 07:26:55

Can I Share My ADSL Connection? (#5129)
Yes you can, however some ISP’s will not give you any technical support while you have your computers networked. All you would do is disconnect any networked computers before phoning the support line.

The simplest way to share your connection if you are sharing between two computers is through ICS (Internet Connection Sharing) this is part of the Windows OS. All that is required is a NIC card in both computers if using a USB modem and a piece of Crossover Cable connecting the two computers together. If you have an ethernet modem you will need two NIC's (one for the modem the other for the cable) in the host and one in the other computer and a piece of Crossover Cable connecting the two computers together.

Another way to share your connection is to use a router. With this you can share your connection to many different computers.

For more help on networking please look at the Networking FAQ's or the Networking Forum

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by laffalot See Profile
last modified: 2002-10-10 19:26:11

How can I tell if my ADSL line is activated? (#5262)
Connect your ADSL modem to the phone socket using the supplied micro-filters or through the fitted master socket. Once you boot your computer up you should see two lights on the modem both of these will flash in a sequence. After thirty seconds to a minute these should both turn solid green.

If both lights are solid green then your line is set-up to use your ADSL connection, ie. your line is activated.

Thanks RocketMBA

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by laffalot See Profile
last modified: 2002-09-21 17:18:26


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