. 28 / . ADSL ( ) /. (. .1). , ADSL, .
.
, . , , . ADSL . , . , ADSL .
(UTP)
1881 , .. . 80 , . 1.1 . , 1.1
300-1.2 / (V.21,V23) | ||
2.4 (V.26) | (QPSK) | |
4.8 / (V.27) | (8-PSK) | |
9.6 / (V.29) | -16 (16-QAM) | |
14.4 / (V.33) | -64 (64-QAM+TCM) | |
19.2 / (V.33bis) | -64 (64-QAM+TCM) | |
28.8 / (V.34) | (DMT) |
,
1.2 ,
300-1.2 / (V.21,V23) | ||
2.4 (V.26) | (QPSK) | |
4.8 / (V.27) | (8-PSK) | |
9.6 / (V.29) | -16 (16-QAM) | |
14.4 / (V.33) | -64 (64-QAM+TCM) | |
19.2 / (V.33bis) | -64 (64-QAM+TCM) | |
28.8 / (V.34) | (DMT) |
ADSL
ADSL AT&T Bell Laboratories . , . .
6.14. .
|
|
. , ADSL , . , , , ADSL. ().
. 6.15. ADSL.
. 6.15 ADSL. / / . , , . , ADSL , 2 / . ADSL , 6 / , .
, , , . ADSL . ADSL , , , ( ), ADSL . , ADSL . ADSL - , , .. (Service Module SM). SM , () (. 6.16).
. 6.16 ADSL-