ϳ , , .
Ethernet 䒺 (.1.4) (.. ). .
.1.4. .
Ethernet 璺 璺: BNC-璺 - (.1.5).
Ethernet . ³ 75 50 . .
T-
BNC-璺
.1.5.ǒ BNC-璺 -.
- . ϳ . , .
ᒺ :
,
RS-232C (Null-modem COM-);
() (Null-modem LPT-); ,
璺 -.
, . , .
, . .
, . , , , . .
, - . .
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, , , , , .
.
( 璺 ) ( ). , . 璺 , COM-璺. , , . ii :
i - , i - ,
i i PCMCIA (PC Card),
i i i.
, .
, 璺 .
ii , ii 4- ii.iii , i . i i .
i i,, i.
i (LDM LimitedDistance Modem Short Range Modem) , i 璺. i ii i .
. i.
. (, i , , i , i). i ii .
- .
i :
- i i -i;
i ; (SVD Simultaneous Voice
and Data).
.
i i i . i i ii. i i i , X.25. , i ii .
.
. , , , . ᒺ , . , .
.
, , ii i i i. .
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.
( i ), i , i i , i , i i, (BBS), , i i.
RS-232C, RS-422, RS-423.
, , .
ֳ , , , .
RS-232C .³ , 25 . . 20000 /. .
-, RS-232C.
RS-232 (..2.1). , , , .
.2.1.
RS-232C.
, RS-422, RS-423 .
RS-422 . 1220 10 /.
RS-423 RS-232C RS-422. ³ ,
. 1220 . 3 /. 300 / ,
12,2 .
, RS-423/422 RS-232C, .
- -
- (null-modem) 璺 , 璺. - : () LPT () . , ( ), ( ).
2 -: DB-25 (, 25-) DB-9 (, 9-).
- . 璺 . . . 璺 , .
, ().
- : , -, (.2.2).
.2.2. .
: : 3... 25; : +3... +25.
+/12. 25 .
|
|
璺 - 2.1.
- (.2.3 .2.4).
.2.3. 璺
.2.4. Null-modem COM RS-232C.
2.1
璺 - ( RS-232C)
9-pin | 25-pin | |||
GND | ||||
TxD | ||||
RxD | ||||
RTS | ||||
CTS | ||||
DSR | ||||
SG | ||||
DCD | ||||
DTR | ||||
RI | ʳ |
MS DOS - :
COPY COM1: < >
.
COPY < > COM1:
.
, - Commander Link (NC), Laplink, Brooklyn Bridge.
- LPT-.
- LPT- , . LPT- CENTRONICS. ³ . . 5 .
500 /, 200 /. 64 . , , , , .
.
Arknet.
Arknet (Attached Resource Computer NETWork) , , . Datapoint 1977 . rcnet
S (Standard Microsistem Corporation), rcnet. , (RG-62) 93 - . 2,5 /. rcnet 㳿 . (ken Bus). :
, , ();
- ; , , .
.
rcnet ISU (Information Symbol Unit ), / . (lt urst), . .
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rcnet 5 :
1. I (Information To Transmit) . . , , .
2. FBE (Free Buffe nquiries) . .
3. . .
4. ( ACKnowledgments) .ϳ , FBE .
5. NAK (Negative AcKnowledgments) .
( FBE) .
Arknet 㳿: .