User Manual
Table Of Contents
- NBG-418N v2
- User’s Guide
- Introduction
- The Web Configurator
- Connection Wizard
- Modes
- Tutorials
- 5.1 Overview
- 5.2 How to Connect to the Internet from an AP
- 5.3 Configure Wireless Security Using WPS on both your NBG-418N v2 and Wireless Client
- 5.4 Enable and Configure Wireless Security without WPS on your NBG-418N v2
- 5.5 Using Multiple SSIDs on the NBG-418N v2
- 5.6 Installing UPnP in Windows 7 Example
- 5.7 Using Bandwidth Management on the NBG-418N v2
- Technical Reference
- Wireless LAN
- WAN
- LAN
- DHCP Server
- Network Address Translation
- Dynamic DNS
- Static Route
- Firewall
- Content Filter
- Remote Management
- Universal Plug-and-Play (UPnP)
- Bandwidth MGMT
- System
- Logs
- Tools
- Sys OP Mode
- Language
- Troubleshooting
- Customer Support
- IP Addresses and Subnetting
- Pop-up Windows, JavaScripts and Java Permissions
- Setting Up Your Computer’s IP Address
- Wireless LANs
- Common Services
- Legal Information
- Index
Appendix E Wireless LANs
NBG-418N v2 User’s Guide
209
Pre a mble 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 NBG-418N v2 uses long preamble.
Note: The wireless devices MUST use the same preamble mode in order to communicate.
IEEE 802.11g Wire le ss 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:
Wire le ss Se c urity Ove rvie w
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 NBG-418N v2 are data encryption, wireless client
authentication, restricting access by device MAC address and hiding the NBG-418N v2 identity.
Table 77 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)