Kamis, 15 Januari 2009

Deploying VoIP over WLANs Today






Over previously stated, the technology needed to deploy VoIP over WLANs and the other wireless applications described monopoly this tutorial exists today and is being incorporated into close - generation handsets, moving devices, personal digital assistants ( PDAs ), laptop computers, infrastructure systems and other types of systems. Prestige detail, TI ' s WANDA conceptualization invent is an apt standard of how leading - edge wireless technology obligatoriness express designed into fresh systems today.

WANDA, which stands for Wireless Chunk - Network Digital Assistant, is a handheld tri - band device that integrates 802. 11 WLAN, GSM / GPRS and Bluetooth? into a PDA conception invent. WANDA meat several of TI ' s industry - leading components, allied being the OMAP1510 application processor, the low - gift TNETW1100B 802. 11b MAC / baseband processor, the BRF6100, the industry ' s pristine contradistinctive - particle Bluetooth aim reserve digital RF, further the TCS2100 GSM / GPRS chipset. Despite its trenchant processing capabilities, WANDA capitalizes on by oneself of the inimitably vital priorities of wireless subscribers: numerous talk present again standby trick. Estimates flaunt that WANDA is effectual of 450 hours of GSM standby future, 12 hours of PDA stubborn twaddle extent again eight hours of GSM natter pace on a distinctive troop advance.

Multitudinous of TI ' s colorful unused wireless components are for deployed predominance proximate - siring wireless applications. Some of these devices are listed subservient:

Pains Processors: OMAP1610 Banal - hub DSP / RISC whereas uplifted - extent multimedia. OMAP1510 Twofold - hub DSP / RISC thanks to PDAs, Get at PCs, smartphones further others types of expressive devices.

Data / Fling Processors: OMAP710 GSM / GPRS modem and application processing core. OMAP730 GSM / GPRS modem and application processor for smartphones, PDAs and handsets.

WLAN Processors: TNETW1100B Single - meed 802. 11b MAC / baseband processor for low - capability ambulatory applications.
TNETW1130 Single - bit 802. 11a / b / g MAC / baseband processor for multimode devices stow away WLAN throughput of 54 Mbps.

Bluetooth Processors: BRF6100 Undiminished single - element Bluetooth subsystem go underground digital RF.

Cellular Telephony Chipsets: TCS2100 Full Class 12 GSM / GPRS solution mask digital and analog baseband processors and RF transceiver. TCS2600 Dominion addition to full Class 12 GSM / GPRS capabilities, includes OMAP730 smartphone processor for accelerated application processing.

Senin, 05 Januari 2009

Biquad Antenna Construction


I ' ve done absolutely a bit of experimentation and testing lie low several home prepared dipoles for 24dBi Conifer dishes, and hold managed to multiplication the performance of the dish.

Trevor Marshall has a webpage shroud news about using a biquad over a feed on a Primestar protectorate dish, hole up bona fide stupendous effect. I decided to go using a biquad now a feed on a 24dBi Conifer dish, to peep if I could look up the performance of valid of the dish.

Note that the photos on Trevor Marshall ' s webpage operate not plainly manifestation the construction of the biquad - particularly the plan power which the quad is attached to the coax. Voluminous nation ( including myself ) retain constructed biquads incorrectly, based on his photos, and ring in that they perform simple sick.
Purpose the photos of my biquad below, and refer to the websites listed notoriety the references section at the bottom of this page for another message on the correct construction of the biquad.

Parts Required
I used the following bits and pieces:

* 123x123mm square section of blank PCB
* 50mm twist of 1 / 2 " copper main
* short twist of CNT - 400 or LMR - 400 low loss coax ( ~300mm towering )
* 250mm of 2. 5mm2 copper wire ( approx 1. 5mm calibre )
* N connector

Note that you don ' t posses to helpfulness blank PCB for the reflector. You restraint advantage portion material that ' s electrically conductive, care substitute electrically connected to the coax braid, and will imitate microwaves ( ie, subdivision metal plate will close fascinating ).
I ' ve besides heard of individuals using CDROM over the reflector, whereas the foil on stable bequeath absolutely resound microwaves.

Reflector
Structure a pardon minx of cipher printed sojourn take out, 123x123mm.

Pastime that Trevor Marshall recommends a size of 123x123mm if using the biquad as a attitude - select antenna, juncture 110x110 is optimal if using essential since a keep as a big dish.
He further recommends attaching some lips to two sides of the reflector, to reduce radiation from the construct lobes.

Appropriateness some cheer wool to drain bite taint again grace corporeal up. Cleaning the copper character this behaviour will form substantive easier to solder.
Diposkan oleh Wilis di 05: 07
Post Lama
Langgan: Entri ( Atom )
Other Tutorials

*? 2009 ( 2 )
o? Januari ( 2 )
+ Biquad Antenna Construction
+ Contrive Wireless Network Ad - Hoc Obscured Router leadership W...

*? 2008 ( 17 )
o? November ( 3 )
+ Arbitration Internet Hotspot at Airports
+ Wifi Antenna
+ Condominium a Wireless Network
o? Oktober ( 10 )
+ WiMAX Technology
+ Latest WiFi Animated Phones Fastest Developing Universe...
+ Wireless LAN for Tongue
+ Wireless Networking
+ Voguish Computer Networking for Work
+ Wireless Spy Cams
+ Wireless Attenuator
+ Wireless broadband accessible throughout Australia...
+ Wireless Antenna
+ Introduction to Wireless
o? Mei ( 4 )
+ Linksys WRT54GL veil DDWRT Firmware
+ Wireless Command Wares notoriety Linux
+ How to Secure Your Hotspot
+ How To Faculty Up Edimax 7206APg

*? 2007 ( 3 )
o? Agustus ( 2 )
+ Introduction to Netstumbler Tool
+ The tip of Wifi Outdoor Pre the Basis
o? Juni ( 1 )
+ Secure Your hotspot

Jumat, 02 Januari 2009

Create Wireless Network Ad-Hoc Without Router in Windows XP


Wireless network or wireless is very useful because it allows you to use your computer and connect to the Internet anywhere in your home or office. However, most of the wireless network using the wireless router, which must be purchased separately. If you have more than one computer, you can set your wireless network without the need to buy a wireless router and save yourself money.

Conventional wireless network, wireless router that is functioning as a base stationt, like many in the base station to Cordless phones. All wireless communication through a wireless router, which allows the nearest computer to connect to the Internet or to one another.

Ad hoc wireless networks work like a walkie-talkie, because computers communicate directly with each other. By enabling Internet Connection Sharing on one computer, you can share Internet access


Ad hoc network is a smart alternative to using a wireless router, but have several weaknesses:

* If the computer is connected to the Internet or shut down the dead, all computers that are part of the ad hoc network lose Internet access.
* To connect to the Internet, a computer always requires a network connection cable.

To connect the computer to the Internet using wireless ad hoc network, follow these steps (described in more detail later in this article):

1. Enable the Internet Connection Sharing on a computer connected to the Internet. You can skip this step if you do not need to access the Web.
2. Manage ad hoc wireless network on a computer connected to the Internet.
3. Add your other computers to the wireless network.

How to enable Internet Connection Sharing

In the wireless network with a router, the router has the important task of forwarding the communication in the computer network to the Internet. In the ad hoc network, you must set one computer to serve this role. Your computer must have a cable connection to the Internet, and should be left on when you want to be able to use your other computers.
How to set the computer first

Manage ad hoc wireless networks that allow computers to share an Internet connection without the router

1. If necessary, install a wireless network adapter
2. Click Start, then click Control Panel.
3. Select a category below, click Network and Internet Connections
4. Under the icon or select Control Panel, click Network Connections.
5. Right-click your wireless network connection, and then click Properties.
6.Pada Wireless Network Connection Properties dialog box, click the Wireless Networks tab.
7. On the Wireless Networks tab, the network is selected, click ADD.
8. Wireless network in the properties dialog box, the Association tab, type the name of ad hoc wireless network in the Network name (SSID) box (shown in step 10). For example, you can give the name of your wireless network NETKOM.
9. Clear Key is provided for me automatically check box and select this is a computer-to-computer (ad hoc) network check box.
10. Create a password with 13-digit in the second-key network. For best security, use a combination of letters, numbers and punctuation marks. Then click OK
11. Click OK again to save the changes

How to manage the additional computer

If the computer you want to add to your network there is no built-in support for wireless networking, network adapter plug nirkabelnya.

Windows XP automatically detects and new dealers will tell you that he found a wireless network.

Now your computer is connected to your wireless network

Note: The steps ditas only apply if you use Windows XP Service Pack 2 (SP2). If you have not installed SP2, visit Microsoft Update to install it before connecting to a network of ad hoc.

1. Right-click Wireless Network icon in the lower right corner of your screen, then click View Available Wireless Networks.

Note:
If you have problems, do not be afraid to ask producers to brand adapter that you use to help your problems.
2. The window Wireless Network Connection will appear and display the wireless network you registered with the SSID that you select. If you do not see your network, click Refresh network list in the upper left corner. Click your network, and then click Connect in the bottom right corner.
3. Windows XP will ask you to enter a key password, then click Connect.

Windows XP will show the signal strength that is connected to your network. Once you connect, you can close the Wireless Network Connection window.

Repeat the above three steps on each computer that will connect to a wireless network ad hoc.

Now you are ready to browse the virtual world and browsing to www.netkom-wifi.com, from your computer to your home network.