C V.34 , : ", 28800 (33600) / ". , . V.34 "" 1994 . 28800 /, 1998 . 33600 /. , :
- . V.34 (3200 3429 /) 3100 , ;
- , - (), . ( ) ;
- , ( , , ), ( ) ;
- . 21 150 3750 , . ( -) , 2400 / - 20 ( , ) 9600 /. - V.34 . 17.2.
V.34, , . , V.90 56 /, V.90- 56ʖ. V.90 56ʖ ITU-T 1998 . . 18.8 ( 33600 / V.34) 56(V.90) . , , , V.34, . - () . - ( 33600 /c). ( ) V.90-, , ( ) V.90-, () 56/c. 64 /, , , , . , 56- 40...50 / 28...33 / .
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|
. 18.8. 56(V.90)
, 33,6 / , , 56 / . , , , .
56 /, :
1. ( ).
2. V.90 . V.90 : , -. V.90 , " upgrade ".
3. - . V.90 - .
2000 . V.92, V.44 V.59. V.92 V.90 . 33,6 (V.90) 48 /. (). 24 48 / 1,333 / V.90. , 20 (V.90) 10 ( Quick Connect). V.44 6:1, 25% V. 42bis, 4:1. ( ) 300 /. , , V.59 , 0 16 . , V.92, , V.90.
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, . 18.1 :
- , ;
- ;
- .
18.1. | ||
1. , | ||
- | ||
power line PLC (power line carrier) | () | 10- / 14 /c ( ) |
cable | ( 40 /) | |
radio | 2 / (-) 50 | |
2. | ||
fax | ||
voice mail | ||
voice | (, ), | |
V.34 | - | 33,6 / |
V.90 /92 (56K) | V.90/92- | 56 / ( ), , V.90/92 |
3. | ||
Win (US Robotics) | RPI, WinRPI, , | , , |
V.90/92- | - | V.90/92 |
internal /external | / | , / ( ); , ( ) |
xDSL - | - | xDSL - |
, . , . , . , . , V.90- , , , , V.90 . (voice modem) , (voice mail), . 18.1.