Voice Over WLANS

The transmission rates and frequency bands are summarized in Table A-1, which was also shown as Table 2-7 and Table 5-1.
| Standard | Maximum Bit Rate (Mbps) | Fallback Rates | Channel Bandwidth | Non-Interfering Channels | Transmission Band | Licensed |
|---|---|---|---|---|---|---|
| 802.11b | 11 | 5.5, 2, or 1 Mbps | 22 MHz | 3 | 2.4 GHz | No |
| 802.11g | 54 | 48, 36, 24, 18, 12, 11, 9, 6, 5.5, 2, or 1 Mbps | 20 22 MHz | 3 | 2.4 GHz | No |
| 802.11a | 54 | 48, 36, 24, 18, 12, 9, or 6 Mbps | 20 MHz | 23 | 5 GHz | No |
| 802.11n (Draft) | ?289 (at 20 MHz) ?600 (at 40 MHz) | Down to 6.5 Mbps (at 20 MHz) | 20 or 40 MHz | 2 in 2.4 GHz 11 in 5 GHz (40 MHz) | 2.4 or 5 GHz | No |
802.11d is a supplementary standard addressing regulatory considerations for radio links in other countries. The North American and ITU Digital Transmission Rates are given in Table A-2.
| North America | ITU | |||
|---|---|---|---|---|
| Level | Bit Rate | Level | Bit Rate | |
| Original Hierarchy | DS-0 | 64 Kbps | DS-0 | 64 Kbps |