PHY, Layer na zahiri na IEEE 802.11, yana da tarihin ci gaban fasaha da ƙa'idodin fasaha:
IEEE 802 (1997)
Fasahar daidaitawa: watsa infrared na FHSS da DSSS
Mitar mita mai aiki: yana aiki a cikin rukunin mitar 2.4GHz (2.42.4835GHz, 83.5MHZ gabaɗaya, an raba shi zuwa tashoshi 13 (5MHZ tsakanin tashoshin da ke kusa), kowane tashoshi yana lissafin 22MHz. Lokacin da ake amfani da tashoshi a lokaci guda, akwai uku marasa- tashoshi masu haɗe-haɗe [1 6 11 ko 2 7 12 ko 3 8 13])
Yawan watsawa: A wannan lokacin, adadin watsawa yana da ɗan jinkiri kuma bayanan yana da iyaka. Ana iya amfani dashi kawai don sabis na samun damar bayanai, kuma matsakaicin adadin watsawa shine 2 Mbps.
Daidaituwa: bai dace ba.
IEEE 802.11a (1999)
Fasahar daidaitawa: fasahar da aka gabatar a hukumance (OFDM), wato orthogonal mita division multiplexing (OFDM).
Mitar mita mai aiki: a wannan lokacin, yana aiki a cikin rukunin mitar 5.8GHz (5.725G5.85GHz, 125MHz gabaɗaya, an raba shi zuwa tashoshi biyar, kowane tashoshi yana lissafin 20MHz, kuma tashoshin da ke kusa da su ba sa mamaye juna, wato, lokacin da ana amfani da tashoshi a lokaci guda, waɗannan tashoshi guda biyar ba sa cin karo da juna).
Yawan watsawa: lokacin da yawan watsawa ya karu, shine 54, 48, 36, 24, 18, 12, 9, da 6. Raka'a a cikin wannan kewayon sune Mbps.
Daidaituwa: bai dace ba.
IEEE 802.11b (1999)
Fasahar daidaitawa: faɗaɗa yanayin IEEE 802.11 DSSS kuma ɗauki hanyar daidaitawa ta CCK
Mitar mitar aiki: 2.4GHz
Yawan watsawa: goyan bayan farashi daban-daban na 11 Mbps, 4.5 Mbps, 2 Mbps, da 1 Mbps
Daidaitawa: Fara daidaitawa zuwa ƙasa tare da IEEE 802.11
IEEE 802.11g (2003)
Fasahar daidaitawa: gabatar da fasahar rarraba mitar mitar orthogonal (OFDM).
Mitar mitar aiki: 2.4GHz
Yawan watsawa: gane matsakaicin adadin watsa bayanai na 54 Mbps
Daidaitawa: Mai jituwa tare da IEEE 802.11/IEEE 802.11b
IEEE 802.11n (2009)
Fasahar daidaitawa: Gabatar da fasahar rarraba mitar mitar orthogonal (OFDM) + fasahar shigarwa da yawa / abubuwan fitarwa da yawa (MIMO)
Mitar mitar aiki: 2.4G ko 5.8GHz
Yawan watsawa: saurin watsa bayanai na iya zuwa 300 ~ 600Mbps
Daidaitawa: Mai jituwa tare da IEEE 802.11/IEEE 802.11b/IEEE 802.11a
Abin da ke sama shine tsarin tarihi na yarjejeniyar IEEE802, wanda ba shi da wuya a samu. Wannan ƙa'idar ta ƙunshi duka mitar mitar 2.4G da 5G. Bugu da ƙari, tare da ci gaban tarihi da ci gaba da bita na yarjejeniya, ƙimar tana tasowa sama. A halin yanzu, matsakaicin matsakaicin saurin band na 2.4G zai iya kaiwa 300Mbps, kuma matsakaicin saurin rikodi na rukunin 5G zai iya kaiwa 866Mbps.
Takaitawa: Ka'idojin da 2.4GWiFi ke goyan bayan sune: 11, 11b, 11g, da 11n.
Ka'idojin da 5GWiFi ke goyan bayan sune 11a, 11n, da 11ac.
Abin da ke sama shine bayanin ilimin WLAN Physical Layer PHY wanda Shenzhen Haidiwei Optoelectronics Technology Co., Ltd ya kawo muku Shenzhen Haidiwei Optoelectronics Technology Co., Ltd.samfurori