(Access Point AP), , LAN, , .. , . AP (roaming), , .
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5 ADSL: ADSL
ADSL (Asymmetric Digital Subscriber Line ) , DSL (Digital Subscriber Line ) xDSL. DSL HDSL (High data rate Digital Subscriber Line ), VDSL (Very high data rate Digital Subscriber Line ) .
DSL 1989 , - , . ADSL ( ) ( , ..) ( , ).
ADSL - ?
, ADSL , . ADSL ADSL , ( 1). , (POTS) ( 2). , ADSL.
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ADSL (.. , ) , ( ). , . ( ) , . , ISDN (Integrated Services Digital Network ).
, , ADSL , - . (, 1 , ADSL) 90 . ADSL , . ADSL . , ADSL, , .
ADSL ( ). . , , . ADSL . (Frequency Division Multiplexing FDM) ( 3). FDM , . . . (Echo Cancellation), ( 3) .
3
ADSL , , , . , . ( POTS Plain Old Telephone Service). , (Plain), (Old); - . , , . , . , , - . ADSL. ADSL ISDN.
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ADSL . , ( ), , , , . ADSL , , . ( ISDN) .
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