Howard Toh

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Thu, Jun 6, 2013 10:00 PM

DIR-865L - Customer Wireless Education by Dlink

Wireless 802.11N

IEEE 802.11n is builds on previous 802.11 standards by adding multiple-input multiple-output (MIMO) and 40 MHz channels to the PHY (physical layer), and frame aggregation to the MAC layer.

Content:

Factors affecting wireless
Actions to improve wireless access
Basic maintenance and troubleshooting of wireless network

Factors affecting wireless

Because wireless signals travel through the atmosphere, they are sensitivity to different types of interference compare to wired network.

1) Physical objects: The number of walls the Wireless signal can pass through is determines by density of the materials used in a building’s construction. Concrete and steel walls are difficult for a signal to pass through. These structures will weaken or at times completely prevent wireless signals.

2) 2.4Ghz Frequency Interference:

a. Cordless Phone - operate the same frequency which the Wi-Fi standards and this can cause a significant decrease in speed, or sometimes the total blocking of the Wi-Fi signal.

b. Microwave Oven - operate by emitting a very high power signal in the 2.4 GHz band and often emit a very "dirty" signal over the entire 2.4 GHz band.

c. Wireless Routers – Wireless Network that share the same wireless channel will reduce the wireless speed performances.

3) Shared bandwidth: The bandwidth of wireless network is shared among all the wireless users, so the more users you have the slower network speed is in the network. Especially downloading Torrent will cause users unable to surf internet properly.

4) Distance: If you sit near to wireless router or access point, you will get high and good network speed but if another person is sitting far from the wireless router or access point, the network speed of both computers will be dropped drastically.

5) Mixed Network (802.11b/g/n): In the network by connecting 802.11n wireless adapter alone you can get good network speed, however once an 802.11g or 802.11b user joined the network, your network connection speed may be slowed by half or more.

6) Locations: The location where an AP or wireless router is placed also makes the different. Place the devices in higher ground to reduce the impact of physical objects.

Below is the Wireless Obstacles Table:

Actions to improve wireless access

1) Wireless Settings for Best throughput between PC and Router:

Wireless settings:

a. 802.11 Mode: Mixed 802.11 n/b/g

b. Channel Width: 20/40Mhz (Auto)

network setting.jpg

Wireless Encryption:

c. WPA Mode: Auto (WPA or WPA2)

d. Cipher Type: AES

network security.jpg

1) Data Point (Access Point)

a) Deploying Access Point around your home, particularly in existing areas of poor or no coverage reduces the average distance between a wireless device and its nearest access point and increases the average speed.

network diagram.jpg

Basic maintenance and troubleshooting of wireless network

Things to look out for when the wireless network start to get “Slow” and the result will still depend on individual environments.

1) Change the wireless channel to less “Crowded” channels.

network channel.jpg

2) Or reboot the router if “Enable Auto Channel Scan” is enable, the router will scan and assign a new channel during the boot up.

auto channelscan.png

3) Or move the wireless network frequency from 2.4GHz to 5 GHz for 802.11a/n.

*Please make sure all the wireless clients (PC) can also support 5GHz otherwise users can only see 2.4GHz SSID.

4) Lastly, user can reset the device to factory default setting by

a. Hardware Reset

With the router powered on, use a paperclip to hold the button down for 10 seconds.

b. Web GUI Reset

Tools > System

soft reset.jpg

*Factory reset will erase all the present settings on the router.

References

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Howard Toh

DIR-865L - Customer Wireless Education by Dlink

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