Appendix B Wireless LANs
NWD271N User’s Guide
103
If the
Fragmentation Threshold
value is smaller than the
RTS/CTS
value (see previously)
you set then the RTS (Request To Send)/CTS (Clear to Send) handshake will never occur as
data frames will be fragmented before they reach
RTS/CTS
size.
Preamble Type
Preamble is used to signal that data is coming to the receiver. Short and long refer to the length
of the synchronization field in a packet.
Short preamble increases performance as less time sending preamble means more time for
sending data. All IEEE 802.11 compliant wireless adapters support long preamble, but not all
support short preamble.
Use long preamble if you are unsure what preamble mode other wireless devices on the
network support, and to provide more reliable communications in busy wireless networks.
Use short preamble if you are sure all wireless devices on the network support it, and to
provide more efficient communications.
Use the dynamic setting to automatically use short preamble when all wireless devices on the
network support it, otherwise the NWD271N uses long preamble.
"
The wireless devices MUST
use the same preamble mode in order to
communicate.
IEEE 802.11g Wireless LAN
IEEE 802.11g is fully compatible with the IEEE 802.11b standard. This means an IEEE
802.11b adapter can interface directly with an IEEE 802.11g access point (and vice versa) at
11 Mbps or lower depending on range. IEEE 802.11g has several intermediate rate steps
between the maximum and minimum data rates. The IEEE 802.11g data rate and modulation
are as follows:
Wireless Security Overview
Wireless security is vital to your network to protect wireless communication between wireless
clients, access points and the wired network.
Table 21
IEEE 802.11g
DATA RATE (MBPS)
MODULATION
1
DBPSK (Differential Binary Phase Shift Keyed)
2
DQPSK (Differential Quadrature Phase Shift Keying)
5.5 / 11
CCK (Complementary Code Keying)
6/9/12/18/24/36/48/54
OFDM (Orthogonal Frequency Division Multiplexing)
Содержание NWD217N
Страница 1: ...www zyxel com NWD217N WLAN 802 11n USB Adapter User s Guide Version 1 0 05 2008 Edition 1...
Страница 2: ......
Страница 8: ...Contents Overview NWD271N User s Guide 8...
Страница 12: ...Table of Contents NWD271N User s Guide 12...
Страница 16: ...List of Figures NWD271N User s Guide 16...
Страница 18: ...List of Tables NWD271N User s Guide 18...
Страница 20: ...20...
Страница 36: ...Chapter 2 Tutorial NWD271N User s Guide 36...
Страница 48: ...Chapter 3 Wireless LANs NWD271N User s Guide 48...
Страница 70: ...Chapter 4 ZyXEL Utility Windows NWD271N User s Guide 70...
Страница 74: ...Chapter 5 Maintenance NWD271N User s Guide 74...
Страница 75: ...75 PART II Troubleshooting and Specifications Troubleshooting 77 Product Specifications 81...
Страница 76: ...76...
Страница 80: ...Chapter 6 Troubleshooting NWD271N User s Guide 80...
Страница 84: ...Chapter 7 Product Specifications NWD271N User s Guide 84...
Страница 86: ...86...
Страница 134: ...Appendix C Windows Wireless Management NWD271N User s Guide 134...
Страница 138: ...Appendix D Legal Information NWD271N User s Guide 138...
Страница 144: ...Appendix E Customer Support NWD271N User s Guide 144...