Nokia N series

Nokia launched N series on 28th April 2005 by Alex kidman. The frist two model launched were N90 and N70 which has 2 megapixel camera with builtin flash and have 3G support.

This two model are the basic model of the Nokia Nseries having metalic surface and fine distinct feature.This two model have the music player,GPRS,EDGE(Class 10, 236.8 kbps),bluetooth (version 2),3G(384kbps),java downloadeable games ,Radio with Visual Internat facility and many more.This two model were responded so much afterwards Nokia start luanching new models of Nseries till now.

About WiFi Ad hoc networks

Most installed wireless LANs today utilize "infrastructure" mode that requires the use of one or more access points. With this configuration, the access point provides an interface to a distribution system (e.g., Ethernet), which enables wireless users to utilize corporate servers and Internet applications.
As an optional feature, however, the 802.11 standard specifies "ad hoc" mode, which allows the radio network interface card (NIC) to operate in what the standard refers to as an independent basic service set (IBSS) network configuration. With an IBSS, there are no access points. User devices communicate directly with each other in a peer-to-peer manner.
Ad hoc applications provide truly wireless solutions
Ad hoc mode allows users to spontaneously form a wireless LAN. For example, a group of people with 802.11-equipped laptops may gather for a business meeting at their corporate headquarters. In order to share documents such as presentation charts and spreadsheets, they could easily switch their NICs to ad hoc mode to form a small wireless LAN within their meeting room. Another example is when you and your associates are waiting for a flight at the airport, and you need to share a relatively large PDF file. Through ad hoc mode, you can easily transfer the file from one laptop to another. With any of these applications, there's no need to install an access point and run cables.
The ad hoc form of communications is especially useful in public-safety and search-and-rescue applications. Medical teams require fast, effective communications when they rush to a disaster to treat victims. They can't afford the time to run cabling and install networking hardware. The medical team can utilize 802.11 radio NICs in their laptops and PDAs and enable broadband wireless data communications as soon as they arrive on the scene.
Some product vendors are beginning to base their solutions on ad hoc mode. As an example, MeshNetworks offers a wireless broadband network system based on 802.11 ad hoc mode and a patented peer-to-peer routing technology. This results in a wireless mesh topology where mobile devices provide the routing mechanisms in order to extend the range of the system. For example, a user on one side of the building can send a packet destined to another user on the far side of the facility, well beyond the point-to-point range of 802.11, by having the signal hope from client device to client device until it gets to its destination. This can extend the range of the wireless LAN from hundreds of feet to miles, depending on the concentration of wireless users.
Pros and cons to consider
Before making the decision to use ad hoc mode, you should consider the following:
Cost savings. Without the need to purchase or install access points, you'll save a considerable amount of money when deploying ad hoc wireless LANs. Of course this makes the bean counters happy, but be sure you think about all of the pros and cons before making a final decision on which way to go.
Rapid setup time. Ad hoc mode only requires the installation of radio NICs in the user devices. As a result, the time to setup the wireless LAN is much less than installing an infrastructure wireless LAN. Obviously this time savings only applies if the facility you plan to support wireless LAN connectivity doesn't already have a wireless LAN installed.
Better performance possible. The question of performance with ad hoc mode is certainly debatable. For example, performance can be higher with ad hoc mode because of no need for packets to travel through an access point. This assumes a relatively small number of users, however. If you have lots of users, then you'll likely have better performance by using multiple access points to separate users onto non-overlapping channels to reduce medium access contention and collisions. Also because of a need for sleeping stations to wake up during each beacon interval, performance can be lower with ad hoc mode due to additional packet transmissions if you implement power management.
Limited network access. Because there is no distribution system with ad hoc wireless LANs, users don't have effective access to the Internet and other wired network services. Of course you could setup a PC with a radio NIC and configure the PC with a shared connection to the Internet. This won't satisfy a larger group of users very well, though. As a result, ad hoc is not a good way to go for larger enterprise wireless LANs where there's a strong need to access applications and servers on a wired network.
Difficult network management. Network management becomes a headache with ad hoc networks because of the fluidity of the network topology and lack of a centralized device. Without an access point, network managers can't easily monitor performance, perform security audits, etc. Effective network management with ad hoc wireless LANs requires network management at the user device level, which requires a significant amount of overhead packet transmission over the wireless LAN. This again leans ad hoc mode away from larger, enterprise wireless LAN applications.

WiFi Ad hoc connection setup for windows Vista

Follow the steps given below...

1. Click the Start Button and select Control Panel.
2. Select Network and Internet. (If Control Panel is in Classic View, skip this step)
3. Open Network and Sharing Center.
4. Select Set up a connection or network (in the left pane).
5. In the resulting window, select Set up a wireless ad hoc (computer-to-computer) network.
6. Click Next and again on the following page.
7. In the Network name textbox, input a name for the network.
8. Select a security type from the dropdown. (If you select WEP, you will need to enter a security key in the unghosted textbox)
9. If you want to use this network more than once, check the Save this network checkbox, if you only need it for a one time fix, leave the checkbox unchecked.
10. Click Next.
11. Click Close.
Your network is now created and can be accessed by other computers in the same manner as connecting to a regular wireless connection. If you utilized WEP, then you will need to give them the security key. If you did not opt to save the network during creation, it will be deleted when everyone has disconnected from it.

What is Ad-Hoc Mode in Wireless Networking?

Question: What is Ad-Hoc Mode in Wireless Networking?
Answer: On wireless computer networks, ad-hoc mode is a method for wireless devices to directly communicate with each other. Operating in ad-hoc mode allows all wireless devices within range of each other to discover and communicate in peer-to-peer fashion without involving central access points (including those built in to broadband wireless routers).
To set up an ad-hoc wireless network, each wireless adapter must be configured for ad-hoc mode versus the alternative infrastructure mode. In addition, all wireless adapters on the ad-hoc network must use the same SSID and the same channel number.
An ad-hoc network tends to feature a small group of devices all in very close proximity to each other. Performance suffers as the number of devices grows, and a large ad-hoc network quickly becomes difficult to manage. Ad-hoc networks cannot bridge to wired LANs or to the Internet without installing a special-purpose gateway.
Ad hoc networks make sense when needing to build a small, all-wireless LAN quickly and spend the minimum amount of money on equipment. Ad hoc networks also work well as a temporary fallback mechanism if normally-available infrastructure mode gear (access points or routers) stop functioning

How to establishwireless Adhoc connection on your pc and laptop??

Here is the some idea for establishing a wireless connection..Now there is no need to put or buy any kind of router because if you have laptop than just follow the step and you would be free to access internate freely.Now we will make a wireless connection in three step by step.1.The first step will be to install an 802.11b(or any wireless card or USB adapter) wireless card in the main computer and configure it as a computer-to-computer (ad hoc) wireless connection.2.The second step will be to install a wireless card in a second computer.3.To complete the network and provide connectivity to the Internet, Internet Connection Sharing (ICS) will be enabled on the host.Configuring the Host ComputerAfter you install an 802.11b adapter on a computer, Windows XP will automatically detect the card, install drivers, and display an icon in the notification area. r cards to construct the ad hoc wireless network here. Although they have native, in-box support in Windows XP, these cards can be updated with even newer drivers and firmware through ). If the computer is in an environment where other wireless networks are in range, Windows should display a list of available networks automatically. However, if no wireless networks are in range, the wireless connection icon may display a red “X” and may not automatically open a View Wireless Networks window. To open this window, click the icon for the wireless connection.Do not select an available network at this time if any are displayed in the Available networks listing. If your computer previously connected to a preferred access point, remove all preferred access points. This will ensure that a connection is made only to the ad hoc network that you are trying to configure.Next, click the Advanced tab at the top of the window. Select Computer to computer (ad hoc) networks only and clear the Automatically connect to non-preferred networks box if it is selected. This setting, along with removing preferred networks, ensures connection to the ad hoc network only.Click the Wireless Networks tab again. Under Preferred Networks, click Add, as shown in Figure 1. In the Wireless Network Properties dialog box, specify a Network name (SSID). Use any name desired, but be sure to use it to configure all computers. Note that the network type is already marked as a computer-to-computer network and that this cannot be changed since it has already been specified that a connection should be made to only ad hoc networks.Wireless Equivalency Protocol (WEP) settings are not being configured at this time because it's easier to get an ad hoc wireless network running smoothly before attempting to configure WEP data encryption. The decision on whether or not to use WEP should be based on your environment. In most cases, for optimum protection and security, after your ad hoc network is running properly, you should return to Wireless Network Properties and specify WEP settings.After configuring the network name (SSID) in the Wireless Network Properties dialog box, the new ad hoc network will be displayed with a PC Card icon to designate that this is a computer-to-computer network.After installing PC Card in a second computer, the Wireless Networks tab displays a list of in-range wireless access points or ad hoc wireless networksSharing the ConnectionNow that a successful ad hoc wireless network has been created, we'll set up Internet Connection Sharing.1.Open Network Connections on the host computer. (Click Start, click Control Panel, click Switch to classic view, and then click Network Connections.2.Click the connection to be shared, and under Network Tasks, click Change settings of this connection.3.On the Advanced tab, select the Allow other network users to connect through this computer's Internet connection check box.4.If you are not using a third party firewall and have not already set up the Internet Connection Firewall (ICF), be sure to check the box enabling this feature.Finally, optionally enable the setting to let other users control or enable this connection.After completing ICS configuration, the Network Connection window on the host computer will display the original wired Ethernet connection and display the status as Shared as well as Enabled. The Network Connection window on the client computer will display the connection on the host as an Internet Gateway.The client computer(s) should now receive a private class, non-routable IP address in the 192.168.0.* address range via DHCP from the host computer and should have full Internet connectivity.Configuring WEPAs connectivity has now been established successfully, the next step is to return to Network Properties and configure WEP settings to ensure the best security possible for the ad hoc network.On the host computer, open the Wireless Network Properties dialog box and select the Data encryption (WEP enabled) check box. Consult the documentation provided by your wireless card manufacturer for the key format and key length.Use the highest level of encryption possible (key length) that is supported by your hardware and drivers. Agere's Orinoco Silver cards are used here, and only support 64-bit WEP (also known as 40 bits). Using the latest drivers and firmware, Windows XP actually automatically detects that this hardware only supports 64-bit encryption and will not allow setting the key to 128 bit. Be sure that if you use an ASCII network key that you pick random characters and letters that can't be easily guessed. The final step is to use the same key and encryption settings and configure the client computer(s). Note: for additional security, consider changing the key on a regular weekly basis