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The BT on-line checker provides an estimation of the likelihood of the ADSL service being available at a particular location (based on telephone number or post code).
Only a survey can take into account all the factors that may prevent service. The on-line checker is an indication that your location is within the distance limitations regarded as having a good chance of receiving service at the maximum upstream speed. In all cases a physical survey is required by BT engineers to confirm that service can be received.
Some users may not be able to access ADSL services because their local telephone exchange has not yet been enabled to provide this service.
Sometimes, although you have an ADSL enabled exchange, your phone line may be of too low quality to enable ADSL to run effectively. This is either due to the length of your cable from the exchange (which must be 5.5 km for 512 Kbps connections and 3.5 km for the 1Mbps and 2Mbps connections), or it may be that there is interference from surrounding cables that lay with your cable underground. Sometimes your cable will be part fibre-optic and ADSL cannot run on a fibre-optic cable.
- BT online checker can be accessed at the following website: www.bt.co.uk/athome
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