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Appendix D Wireless LANs
ADSL Series User’s Guide
315
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 ZyXEL Device uses long preamble.
Note: 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.
Wireless security methods available on the ZyXEL Device are data encryption, wireless client
authentication, restricting access by device MAC address and hiding the ZyXEL Device identity.
Table 102
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 P-660HN-F1
Страница 2: ...Videos ADSL Series User s Guide 2 Videos File Sharing Video Example 55 QoS Video Example 76...
Страница 6: ...Document Conventions ADSL Series User s Guide 6 Server Firewall Router Switch...
Страница 8: ...Safety Warnings ADSL Series User s Guide 8...
Страница 10: ...Contents Overview ADSL Series User s Guide 10...
Страница 19: ...19 PART I User s Guide...
Страница 20: ...20...
Страница 26: ...Chapter 1 Introduction ADSL Series User s Guide 26...
Страница 40: ...Chapter 2 Introducing the Web Configurator ADSL Series User s Guide 40...
Страница 80: ...Chapter 3 Tutorials ADSL Series User s Guide 80...
Страница 81: ...81 PART II Technical Reference...
Страница 82: ...82...
Страница 130: ...Chapter 6 Wireless ADSL Series User s Guide 130...
Страница 160: ...Chapter 8 Routing ADSL Series User s Guide 160...
Страница 164: ...Chapter 9 DNS Route ADSL Series User s Guide 164...
Страница 182: ...Chapter 11 Network Address Translation NAT ADSL Series User s Guide 182...
Страница 190: ...Chapter 13 Firewall ADSL Series User s Guide 190...
Страница 202: ...Chapter 15 Certificates ADSL Series User s Guide 202...
Страница 222: ...Chapter 16 VPN ADSL Series User s Guide 222...
Страница 226: ...Chapter 17 System Monitor ADSL Series User s Guide 226...
Страница 228: ...Chapter 18 User Account ADSL Series User s Guide 228...
Страница 242: ...Chapter 24 Backup Restore ADSL Series User s Guide 242...
Страница 246: ...Chapter 25 Diagnostic ADSL Series User s Guide 246...
Страница 254: ...Chapter 26 Troubleshooting ADSL Series User s Guide 254...
Страница 262: ...Chapter 27 Product Specifications ADSL Series User s Guide 262...
Страница 302: ...Appendix B Setting Up Your Computer s IP Address ADSL Series User s Guide 302...
Страница 310: ...Appendix C Pop up Windows Java Script and Java Permissions ADSL Series User s Guide 310...
Страница 334: ...Appendix E Common Services ADSL Series User s Guide 334...
Страница 355: ...Appendix F Open Software Announcements ADSL Series User s Guide 355...
Страница 356: ...Appendix F Open Software Announcements ADSL Series User s Guide 356...
Страница 360: ...Appendix G Legal Information ADSL Series User s Guide 360...