D-Link DSL 2740B - Manual (Page 49)

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Channel
Operation channel of your access point. Channel availability is different for
different countries due to their regulation.
802.11 Mode
Select Mixed 802.11ng and 802.11b to operate in b/g/n mode. Or
select specified mode to use.
Bandwidth
Channel bandwidth. Maximum rate for 20 MHz is 130 Mbps. Maximum
rate for 40 MHz is 270 Mbps.
802.11n Rate
Select Auto to operate in all available transmission rates. Or select
specified rate to use.
Fragmentation Threshold
Maximum frame size. Frame larger than the threshold are fragmented into
multiple packets and transmitted. The range is 256~2346 bytes.
RTS Threshold
If a network packet is smaller than the preset RTS threshold size, the
RTS/CTS mechanism will not be enabled. The router sends Request to
Send (RTS) frames to a particular receiving station and negotiates the
sending of a data frame. After receiving an RTS, the wireless station
responds with a Clear to Send (CTS) frame to acknowledge the right to
begin transmission.
The range is 0~2347 bytes.
DTIM Interval
Interval of the Delivery Traffic Indication Message (DTIM). A DTIM field is
a countdown field informing clients of the next window for listening to
broadcast and multicast messages. When the router has buffered
broadcast or multicast for associated clients, it sends the next DTIM with a
DTIM Interval value. Its clients hear the beacons and awaken to receive
the broadcast and multicast message. The range is 1~255 milliseconds,
Beacon Interval
The Beacon Interval value indicates the frequency interval of the
beacon. A beacon is a packet broadcast by the router to synchronize the
wireless network. The value is 1~65535 milliseconds.
Preamble Type
The preamble is used to synchronize the transmitter and receiver and
derives common timing releationship. The Short preamble improves
throughput but not all wireless clients support short preamble type.
Transmit Power
5-level of transmit power are available: 20%, 40%, 60%, 80%, and
100%.
WLAN SECURITY
In the WLAN Security window, select the type of security you want to configure. The window will change to present
the settings specific to the method being configured. The Router’s wireless security options include WEP, 802.1x, WPA,
WPA-PSK(Pre- Shared Key), WPA2, WPA2-PSK, Mixed WPA/WPA2, Mixed WPA/WPA2-PSK.
WEP
WEP (Wireless Encryption Protocol) encryption can be enabled for security and privacy. WEP encrypts the data
portion of each frame transmitted from the wireless adapter using one of the predefined keys. The router offers 64-, or
128-bit encryption with four keys available.
1. Select Network Authentication type from the drop-down list. (Shared is bettern than Open)
2. Select Encryption Strength from the drop-down list. (128-bit is stronger than 64-bit)
3. Specify the encryption key from the Current Network Key drop-down list.
4. Enter the key into the Network Key field 1~4. (Key length is outlined at the bottom of the window.)