ADTRAN NetVanta 160 Instrukcja Użytkownika Pobierz pdf (Strona 4)

NetVanta 160 Series Wireless Configuration Guide Introduction to Wireless Technology

connection time for the mobile user. The number of clients using A cards is also less than with B/G cards,

an important factor in determining your network’s needs.

802.11n

The 802.11n standard is the newest widely adopted standard in the 802.11 family. The 802.11n builds on

the previous 802.11 standards by adding multiple-input multiple-output (MIMO) and 40 MHz channels to

the physical layer, as well as adding frame aggregation to the medium access control (MAC) layer. The 40

MHz channels double the channel width from the 20 MHz of previous 802.11 channels and provide twice

the data rate available over previous channels. These 40 MHz 802.11n channels can be enabled in 5 GHz

mode, or in the lower 2.4 GHz modes of the 802.11b/g channels as long as it will not interfere with any

other 802.11 devices (802.11b/g radios or Bluetooth devices).

802.11n devices should generally operate in 5 GHz mode because there are fewer overlapping radio

channels and less interference than in the 2.4 GHz mode. When creating a network with 802.11b/g/n radios

and devices, configuring the 2.4 GHz radio to operate and legacy 802.11b/g mode and the 5 GHz radio to

operate in 802.11a/n mode provides the most optimal 802.11 radio configuration for both legacy and new

devices.

Comparing 802.11b/g/a/n

The following chart compares the major characteristics of all four standards.

Table 1. WLAN Standards Characteristics

Characteristic 802.11b 802.11g 802.11a 802.11n

Frequency Band 2.4 GHz 2.4 GHz 5.8 GHz 2.4 GHz or

5 GHz

Modulation Direct-sequence

spread spectrum

(DSSS)

DSSS/Orthogonal

frequency-division

multiplexing

(OFDM)

OFDM OFDM

Data Rates 1, 2, 5.5,11 Mbps DSSS - 1, 2, 5.5,

11 Mbps

OFDM - 6, 9, 12,

15, 24, 36, 48,

54 Mbps

6, 9, 12, 15, 24,

36, 48, 54 Mbps

7.2, 14.4, 21.7,

28.9, 43.3, 57.8,

65, 72.2 Mbps for

20 MHz

15, 30, 45, 60, 90,

120, 135,

150 Mbps for 40

MHz

Max Data Rate 11 Mbps 54 Mbps 54 Mbps 150 Mbps

(20 MHz)

300 Mbps

(40 MHz)

1 2 3 4 5 6 7 8 9 ... 57 58

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