ASYMMETRIC DIGITAL SUBSCRIBER LINE
\ˌe͡ɪsɪmˈɛtɹɪk dˈɪd͡ʒɪtə͡l səbskɹˈa͡ɪbə lˈa͡ɪn], \ˌeɪsɪmˈɛtɹɪk dˈɪdʒɪtəl səbskɹˈaɪbə lˈaɪn], \ˌeɪ_s_ɪ_m_ˈɛ_t_ɹ_ɪ_k d_ˈɪ_dʒ_ɪ_t_əl s_ə_b_s_k_ɹ_ˈaɪ_b_ə l_ˈaɪ_n]\
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(ADSL, or Asymmetric DigitalSubscriber Loop) A form of Digital Subscriber Line in whichthe bandwidth available for downstream connection issignificantly larger then for upstream. Although designedto minimise the effect of crosstalk between the upstream anddownstream channels this setup is well suited for webbrowsing and client-server applications as well as forsome emerging applications such as video on demand.The data-rate of ADSL strongly depends on the length andquality of the line connecting the end-user to the telephonecompany. Typically the upstream data flow is between 16 and640 kilobits per second while the downstream data flow isbetween 1.5 and 9 megabits per second. ADSL also provides avoice channel.ADSL can carry digital data, analog voice, and broadcastMPEG2 video in a variety of implementations to meet customerneeds.["Data Cooks, But Will Vendors Get Burned?", "SupercommSpotlight On ADSL" & "Lucent Sells Paradine", Wilson & Carol,Inter@ctive Week Vol. 3 #13, p1 & 6, June 24 1996].See also Carrierless Amplitude/Phase Modulation, DiscreteMultiTone.ADSL Forum (http://adsl.com/).
By Denis Howe
Word of the day
Snake's-head
- Guinea-hen flower; -- so called in England because its spotted petals resemble the scales of a snake's head.