DELOVANJE POVEZAV V STANOVANJU

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Presentation transcript:

DELOVANJE POVEZAV V STANOVANJU 31. maj 2003 Marjan BEZJAK

31. maj 2003 Marjan BEZJAK

Zgodovina Bluetooth Ericsson leta 1994 postavi smernice razvoja BT SIG - Special Interest Group SIG osnovan leta 1998: Ericsson, Intel, IBM, Toshiba, Nokia Pridružitev leta 1999: Microsoft, Lucent, 3Com, Motorola, Agere Specifikacija Leta 1998 Specifikacija V1.0 Trenutno v uporabi V1.1 od leta 2001 V pripravi je V1.2 Odprta tehnologija (specifikacija prosto dostopna) 31. maj 2003 Marjan BEZJAK

Bluetooth protokolni sklad 31. maj 2003 Marjan BEZJAK

Skrbi za fizično povezavo deluje v ISM frekvenčnem območju: Bluetooth Radio Skrbi za fizično povezavo deluje v ISM frekvenčnem območju: od 2400 - 2483,5 MHz (Francija 2446,5 - 2483,5 MHz) 31. maj 2003 Marjan BEZJAK

Pasi delovanja so razdeljeni v kanale široke po 1 MHz Bluetooth Radio Pasi delovanja so razdeljeni v kanale široke po 1 MHz uporabljena je GFSK modulacija (Gaussian Frequency Shift Keying) fizični pretok podatkov = 1 Mbps po RF kanalu 31. maj 2003 Marjan BEZJAK

Bluetooth Radio BLUETOOTH naprave delimo na 3 razrede glede na izhodno moč oddajnika: RAZRED 1 = 100mW (20 dBm), domet okrog 100 m RAZRED 2 = 2,5 mW (4 dBm), domet okrog 25 m RAZRED 3 = 1mW (0 dBm), domet okrog 10 m 31. maj 2003 Marjan BEZJAK

RAZRED 2, 2,5mW, 25m RAZRED 3, 1mW, 10m RAZRED 1, 100mW, 100m Bluetooth Radio RAZRED 1, 100mW, 100m 31. maj 2003 Marjan BEZJAK

Povezovanje med napravami Baseband Frekvency Hopping Časovni okvirji Povezovanje med napravami 31. maj 2003 Marjan BEZJAK

Baseband Frekvency Hopping Kanal se zamenja 1600 krat na sekundo. Dve napravi sta lahko moteni med seboj le 1/1600 sekunde. Zagotovljena prva stopnja varnosti 31. maj 2003 Marjan BEZJAK

31. maj 2003 Marjan BEZJAK

Baseband Frekvency Hopping Kanal se zamenja 1600 krat na sekundo. Dve napravi sta lahko moteni med seboj le 1/1600 sekunde. Zagotovljena prva stopnja varnosti 31. maj 2003 Marjan BEZJAK

Baseband Časovni okvirji Je paketno orientirana komunikacija, kar pomeni, da se vsak oddani paket pošlje po svojem hop kanalu. Časovni okvir je dolg 625 mikro sekund. Vsak paket lahko zajema od 1 do 5 časovnih okvirjev. Če je paket daljši od enega okvirja, se frekvenca ne spremeni do konca paketa. 31. maj 2003 Marjan BEZJAK

Baseband Povezovanje med napravami Point to point - Point to Multipoint Povezave se izvajajo po fizičnih kanalih. Dve ali več naprav, ki si delijo isti fizični kanal tvorijo PICONET. Ene naprava v PICONETU je MASTER ostale SLAVE. Aktivnih podrejenih (SLAVE) naprav je lahko največ 7+1 MASTER; fizični kanal vedno kontrolira MASTER 31. maj 2003 Marjan BEZJAK

Piko omrežje 31. maj 2003 Marjan BEZJAK

Razpršeno omrežje 31. maj 2003 Marjan BEZJAK

Povezovanje med napravami - Fizične povezave Baseband Povezovanje med napravami - Fizične povezave SCO Synchronous Connection Oriented ACL Asyncchronous Connection Less 31. maj 2003 Marjan BEZJAK

Vedno Point to point med MASTER in SLAVE-om Baseband SCO - Synchronous Connection Oriented Tip Bitov Voice Simetrični Max pretok HV1 10 1,25ms 64kb/s HV2 20 2,50ms 64kb/s HV3 30 3,75ms 64kb/s Vedno Point to point med MASTER in SLAVE-om 31. maj 2003 Marjan BEZJAK

Baseband ACL - Asyncchronous Connection Less Max. hitrost prenosa 723,2 kb/s uplink in 57,6 kb/s downlink (ali obratno) Simetričen link s hitrostjo 433,9 kb/s Point to multipoint 31. maj 2003 Marjan BEZJAK

Vsaka naprava je lahko v dveh stanjih: Povezovanje naprav Vsaka naprava je lahko v dveh stanjih: Connection State Stand By State (je privzeto stanje ob zagonu naprave) 31. maj 2003 Marjan BEZJAK

31. maj 2003 Marjan BEZJAK

Povezovanje dveh računalnikov Tiskanje Brezžične slušalke za GSM Primeri uporabe Povezovanje dveh računalnikov Tiskanje Brezžične slušalke za GSM Bluetooth v fotografskem aparatu Avtomatično plačevanje računov 31. maj 2003 Marjan BEZJAK

31. maj 2003 Marjan BEZJAK

Viri: http://www.bluetooth.com http://www.ietf.org/proceedings/00jul/SLIDES/ipobt-tech/index.htm http://www.mobileinfo.com/Bluetooth/how_works.htm http://www.nokia.com/bluetooth/wireless.html http://www.motorola.com/bluetooth/action/index.html http://www.howstuffworks.com http://www.slo-tech.com/clanki/modrizob/modrizob.shtml http://www.mobilatorij.org/sl.php/mobilatorij/vsebine/a-z/bluetooth/ http://ldos.fe.uni-lj.si/vaje/Mtk/S_2001_02/cvijicnagode.pdf http://www.ltfe.org/pdf/Omrezje_Bluetooth.pdf 31. maj 2003 Marjan BEZJAK