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 | | One-tenth of a bel, a unit of measurement common in electronics that quantifies the loudness or strength of a signal. |
 | | The services can be symmetrical, with the same data rate in both upstream and downstream directions, or asymmetrical, with the downstream capacity greater than the upstream capacity. |
 | | As DSL data rates increase, the distance over which the service is provided decreases; certain users who are located too far from the telephone company’s central office may not be able to obtain the higher speeds or, in some cases, may not be able to receive the service at all. |
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