The Dark Side of Hardware Upgrade Forum

anche l'attuale 802.11n lavora a 5 ghz.

infatti fa cagare...
è utile solo se lavora in simultanea con il 2.4GHz

wifi N non raggiunge manco quella che dovrebbe essere la velocità di targa del G

http://www.anandtech.com/show/4577/airp ... er-wifi-/6

a 2.4 ghz i canali sono da 20 mhz, non 40, quindi la banda si dimezza.

sì ma fc del test con iperf

con un semplice trasferimento di file le prestazioni crollano, c'è anche il grafico

io sul 2.4GHz uso 20+40

Each 802.11ac channel is wider than any previous WiFi standard at 80MHz with optional support for 160MHz (40MHz is the widest you can get on 802.11n, although 20MHz is still not uncommon).

a 2.4 ghz i canali sono da 20 mhz, non 40, quindi la banda si dimezza.

no

Effectively to use this feature, you will block 7–9 of the 13 channels and, of course, ch12 and ch13 aren't available in North America. So yes, it's possible that your neighbors will hate you if you turn this option on. This is why there was a lot of pushback at the end of the final IEEE 802.11n ratification to entirely ban 40Mhz in 2.4GHz. That didn't happen as 40MHz is still appropriate for some situations (ie: a warehouse) but the bottom line remains, enabling 40MHz in the 2.4GHz band isn't a good idea for dense residential areas.

ricordavo che alla fine l'avessero proibito per ovvi motivi di sovraffollamento della banda a 2.4 ghz, ma ricordavo male.
cmq:

EDIT by supermario: un'altra offesa personale e scatta il ban

And if you’re in Las Vegas at CES 2012, vendors will show next-generation Wi-Fi in two different frequencies: 5GHz, for what will eventually be the IEEE 802.11ac standard, and 60GHz, for what will eventually be 802.11ad. The former can reach data rates of 1.3 gigabits per second, the latter, up to 7Gbps.

Another group of vendors will demonstrate a complementary Wi-Fi standard running in the 60GHz band. The higher frequency means 802.11ad has less “penetrating power” than its lower frequency cousin. But 11ad has much more available spectrum, and still wider channels, and hence a much larger “wireless pipe” through which energy, and data, is being pushed. By relying on this spectrum, 11ad avoids the need for some of the innovative, but necessarily more complex, features in 11ac to maximize performance. Radios based on 11ad will forge short-range, very high-throughput connections between clients and access points and among client devices themselves. An example is in-room video distribution, between a set top box and various displays, or between a tablet and a large flat panel TV.

The 60GHz Wi-Fi products will be, relatively speaking, simpler than 11ac. More spectrum and still wider channels create a larger wireless pipe, supporting eventually the near-7Gbps data rate, though the first group of products, also expected around mid-2012, will likely be 1-2Gbps