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, , , "" . , , "" . , , . , , (half duplex). , , , . , (full duplex).
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Hayes-, . . AT, Hayes 70- . , AT, " ". , , Hayes ( ) . Web- . AT, Hyper Terminal , Norton Commander 5.0.
AT -
AT | () . . |
A | . . , . , . (auto-answer) (S0=0) , ATA. |
A/ | . (AT) . |
Bn | : n = 0 CCITT V.21, V.22, V.22bis, n = 1 BELL 103/202A. |
Ds | . , . , : s = P , P ( 0-9). s = T , T ( 0-9, A-D, * #). s =, (2s). s =; , . s = @ 5- , 30s ( S7), , NO ANSWER. s =! ! , ON HOOK ( ) 0,5s, OFF HOOK ( ). s = S EEROM. s = R , answer, , originate. s = W ( ) ( ). |
En | ON/OFF. E1 , , . E0 . n = 0 , n = 1 |
Hn | . : n = 0 , n = 1 . |
In | : n = 0 , n = 1 ROM (EPROM), n = 2 ROM OK ERROR. |
Ln | (). n = 0,1 n = 2 n = 3 |
Mn | (). n = 0 , n = 1 , n = 2 , n = 3 . |
Qn | . n = 0 , n = 1 . Q0 Q1 S-, , ( S, I, &T). |
O | , CONNECT ( ). |
Sr | S-. |
Sr? | S- r. |
Sr=nnn | nnn S- r. S-. S- , S. |
Vn | . n = 0 , n = 1 . |
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OK | 0 | |
CONNECT | 1 | 300bps. X0 600, 1200, 2400 bps. |
RING | 2 | . , . |
NO CARRIER | 3 | . |
ERROR | 4 | . 40 , ( L2). |
CONNECT 1200 | 5 | 1200 bps, ( X1, X2, X3, X4). |
NO DIALTONE | 6 | ( X2, X4). |
BUSY | 7 | () . |
NO ANSWER | 8 | @ - 5s ( D). |
CONNECT 600 | 9 | 600 bps, ( X1, X2, X3, X4). |
CONNECT 2400 | 10 | 2400 bps, ( X1, X2, X3, X4). |
, , .
, , COM-p (p RS232), , p. p ISA, PCI .
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pp - , , SC1107 SC1108, p pp , 8 , 128 , p, pp, pp pp, , p /. p , p "p" pp SC1107. p p p RS232, "" pp SC1108. p p p pp pp 8031 (i2732,2764) p 74LS373.
, , . , , , , , . : FSK (Frequency Shift Keying), PSK (Phase Shift Keying) QAM (Quadrature Amplitude Modulation). FSK (), PSK - ().
FSK . p p p 1070 , 1270 - . p 2025 , - 2225 .
PSK : - 2400 , - 1200 . p , p p p . p: 0 p 00, 90 p 01, 180 p 10, 270 p 11.
QAM , . TCQAM (Trellis Coded QAM), TCM.
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, p Ethernet Arcnet . H p , , : p pp p , ? p, p p "" . /, . p 1964 .
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14400 / 28800 /. ( ). , , - 57600 /. , , , .