Netgear RANGEMAX WPN111 User Manual download pdf (Page 50)

User Manual for the NETGEAR RangeMax™ Wireless USB 2.0 Adapter WPN111

B-4 W ireless Networking Basics

202-10076-01

Note: The available channels supported by the wireless products in various countries are different.

For example, Channels 1 to 11 are supported in the U.S. and Canada, and Channels 1 to 13 are

supported in Europe and Australia.

The preferred channel separation between the channels in neighboring wireless networks is 25

MHz (5 channels). This means that you can apply up to three different channels within your

wireless network. There are only 11 usable wireless channels in the United States. It is

recommended that you start using channel 1 and grow to use channel 6, and 11 when necessary, as

these three channels do not overlap.

802.11a Legal Power Output and Wireless Channels

IEEE 802.11a utilizes 300 MHz of bandwidth in the 5 GHz Unlicensed National Information

Infrastructure (U-NII) band. Though the lower 200 MHz is physically contiguous, the FCC has

divided the total 300 MHz into three distinct domains, each with a different legal maximum power

output. Below is a table of summary for different regulatory domains.

Table B-2: 802.11a Radio Frequency Channels

Note: Please check your local Authority for updated information on the available frequency and

maximum power output.

IEEE 802.11a uses Orthogonal Frequency Division Multiplexing (OFDM), a new encoding

scheme that offers certain benefits over a spread spectrum in channel availability and data rate.

The 802.11a uses OFDM to define a total of 8 non-overlapping 200 MHz channels across the 2

lower bands; each of these is divided into 52 sub carriers and each carrier is approximately 300

KHz wide.

U-NII Band Low Middle High

Frequency (GH z) 5.15 – 5.25 5.25 – 5.35 5.725 – 5.825

M ax. P ower O u tp u t • 50 m W for U S

•200 mW for Canada,

E u rop e, and A ustralia

•250 mW for US

• 200 m W for E u rop e and

Australia

•1 W for Canada

• 1 W for U S and A u stralia

•4 W for Canada

• 25 m W for E u rop e

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 86 87

No comments

Netgear RANGEMAX WPN111 User Manual Page 50