¾ ;
¾ ;
¾ ;
¾ ( );
¾ .
3 ADSL
ADSL (Asymmetric Digital Subscriber Line ) , . , . .
3.1 ADSL
ADSL ADSL (. DSL Access Multiplexer, DSLAM), , , DSLAM . - . DSLAM DSL .
3.2 ADSL .
ADSL , . . , . . . . ADSL . . DSLAM. . . , DSLAM : Annex A Annex B. ADSL : ( ) ( ), . - . DSLAM .
ADSL . , . , . : . 20 ( 20 ). . , . ,
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( , ), . , DSLAM, . DSLAM, . , . ( ). , .
? . . , . NEXT FEXT.
, , . ? ? .1.
. DSL - DSL : , . , : . . , . , . . . DSL - DSL ADSL/ADSL2+ [Annex A+B].