, , . Smart-.
. Intel 8086, 80186, 80286, 80386$; Motorola 68020, 68030 .. , Intel 89024, 89027, 89024, 89124.
. , . , .
- Hayes. V.25bis.
: . :
-
-
-
- ( (<Alt><H>))
- ESCAPE.
connect :
-
- .
. ESCAPE . , . . - .
-
, , ESCAPE /. , <ENTER> . <>.
:
:
Z
-
; - .
-
-
-
-
0
- .
ARQ.
HDLC :
( 6 , 15); 15 .
. , .
|
|
, 0 .
HDLC (ASCII, EBCDIC .). . , , 0 . (. . 1).
, , .
. ( ), . 1 (CRC).
, - . , .
,
.
ARQ Automatic Repeat Request
SAW Stop And Wait
GBN Go to back N REJ (ect)
SR selective reject SREJ
:
SAW
, - /, - .
GBN
- , .. . V.42 .