() , . IR (Infra Red) Connection , . - , , . -. , : (PDA), , ..
( 115,2 /), (1,152 /) (4 /) . , , , , .. , . 1993 IrDA (Infrared Data Association), . IrDA 1.1, Hewlett Packard HP-SIR (Hewlett Packard Slow Infra Red) Sharp ASK IR (Amplitude Shifted Keyed IR). :
♦ IrDA SIR (Serial Infra Red), HP-SIR 9,6115,2 /;
♦ IrDA HDLC, IrDA MIR (Middle Infra Red) 0,576 1,152 /;
♦ IrDA FIR (Fast Infra Red) 4 /;
♦ ASK IR 9,6-57,6 /.
- , 880 ; 30. PIN-, - 15. IrDA , , -. , . : , , , ( ) . . IrDA (Bit Error Ratio, BER) 10-9 1 ( 10 ). , , . ( ) .
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IrDA , .
, IrDA.
♦ IrDA SIR 2,4115,2 / ( -): - (), 8 - (). 3/16 (1,63 115,2 /), ( IrDA SIR-). , , -. 1.1 IrDA SIR-B, 1,63 .
♦ ASK IR 9,657,6 / , : 500 , .
♦ IrDA HDLC 0,576 1,152 / , SIR, 1/4- . HDLC, 01111110, (bit stuffing). 16- CRC-.
♦ IrDA FIR (IrDA4PPM) 4 / , . - : 00→1000, 01→0100, 10→0010, 11→0001 ( 1 ). . . 32- CRC-.
IrLAP (IrDA Infrared Link Access Protocol) HDLC, -. : , , , . . IrLAP , . 9600 /, (9, 6, 19,2, 38,4,57,6 115,2 /) ( ).
IrLAP IrLMP (IrDA Infrared Link Management Protocol). ( IrDA : ). IrLMP , , . IrLMP , . .
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Tiny TP (IrDA Transport Protocols) , ( , ..), ( TCP). IrTP.
IrCOMM - :
♦ 3- RS-232C (TXD, RXD GND);
♦ 9- RS-232C ( -);
♦ Centronics ( ).
IrLAN , Ethernet Token Ring. - - IrDA, () , ( ).
IrOBEX (Object Exchange Protocol) , PUT GET . Tiny . IrOBEX , , GSM ( , , , ..), ( PDA).
, -. , (, ..) 880 , .
IrDA ; ( ), , . (30 15 ) ( 1 ).
115,2 / (IrDA SIR, HP-SIR, ASK IR) UART, 16450/16550 -. ( 115,2 /) COM2. UART , . COM2 , CMOS Setup ( COM2). ( ISA, PCI, PC Card); -.
IrDA, - DMA, . UART , . IrDA FIR ; , SIR.
IR-Connector ( ) (mini-DIN), - . , , ( ) . ; . 3.1. , FIR SIR, IRRX ( SIR) FIRRX ( FIR). , .
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3.1.
| / | ||||
1 | 2 | 3 | 4 | ||
IRRX(RX) | 1 | 3 | 3 | 3 | |
FIRRX(RXH) | FIR | 5 | 4 | ||
IRTX(TX) | 3 | 5 | 1 | 1 | |
GND | 2, 7 | 4 | 2 | 2 | |
Vcc (+5B) | 4, 6 | 1 | 5 | 5 | |
NC | 2 | 4 |
- RS-232C - USB. USB FIR, - SIR. - IrDA SIR - , : - , 16- ( UART -). - . ASK IR , TXD ; .
IrDA . Windows 9x/ME/2000 IrDA . ( , ); ; ; PDA, ; , .
Bluetooth
Bluetooth ( ) ( ) , . , 3Com, Agere Systems, Ericsson, IBM, Intel, Microsoft, Motorola, Nokia, Toshiba. , Bluetooth Special Interest Group, . Bluetooth (www.bluetooth.com), , ( 15 PDF-). , . һ ( ). , , .
, 2,4 . , , . () , F=2402+k (), k=0, , 78. (, , ) F-2454+k (k=0, , 22). , . , 1, 2,5 100 , .
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, . (79 23 ). , ( ), (piconet), 2 8 . 7 . , : ( ) , , . (17); (), . (- ). , (scatternet). , , ( , ). , . , ( ).
- 625 , 227. - , (1600 ). . , 1 5 -. , , 625 , ( ). : , ( ).
: .
( ) , SCO link (Synchronous Connection-Oriented), (, ). - , ( ), . . . SCO . SCO . SCO .
, ACL link (Asynchronous Connection-Less), - . , SCO, . , ( ). . . ACL.
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, 02745 . ACL CRC- ( ) 1 ( ). SCO CRC-, , .
. CRC-, . FEC (Forward Error Correction code). FEC 1/3 , . FEC 2/3 , , 10- .
64 / . PCM (- ) CVSD (Continuous Variable Slope Delta Modulation - ). PCM G.711; ( , 8- 8 /). CVSD PCM- 64 /, 4-32 . () , (, MP3) .
723,2 / ( 57,6 /) 433,9 / .
(link layer), , , .
SDP (Service Discovery Protocol), . , , (, , ..).
RFCOMM (9- RS-232) L2CAP. ( -) , - . ( ), . RFCOMM OBEX, ( IrDA), RFCOMM PPP, TCP/IP, . RFCOMM AT-, ( ).
- TCS BIN (Telephony Control protocol Binary), ( ), L2CAP. TCS.
- HCI (Host Controller Interface) - . , . L2CAP . : (, PC Card), USB, -. HCI , HCI .
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