3. A família DSL: os principais componentes
ADSL - Assymetric DSL
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HDSL - High bit-rate DSL
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IDSL - ISDN DSL (Integrated Services Digital Network DSL)
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MSDSL - Multirate Single pair DSL
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RADSL - Rate Adaptative DSL
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SDSL - Symmetric DSL
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VDSL - Very high bit-rate DSL
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