Archive for March 26th, 2010

How to protect your Wireless Network

March 26th, 2010

Now we use the wireless network moer and more in our laptop iPhone and other mobile devices. The same time ee enjoy the convenience of wireless, we also face this situation, someone intrude into our wireless network without permission. They steal our network and laptop battery resource by wireless. What should we do, we must protect our wireless network.

Unlike wired networks, wireless networks use radio signals to communicate. Because radio signals travel outside your home network, other wireless devices can pick up unprotected signals and connect to the network (uninvited) or capture information not sent through it. For example, a Dell Inspiron 6400 Battery network could be created at home to be accessible by its neighbor.

Protect your wireless network

Consider the following safety precautions when setting up your wireless network.

Use a wireless transmitter with a function of security features

Many cellular base stations, gateways or routers offer integrated security features such as wireless security protocols and firewalls. With the right wireless transmitter, you can protect your network from the most common Dell Latitude D430 Battery wireless security risks.

Working behind a firewall

a firewall is a barrier that controls the data and data requests sent to the Dell Latitude D420 Battery network and discards any suspicious objects. Firewalls are available in many variants, both software and hardware. Some networks use a combination of both.

Use wireless encryption

There are a variety of sophisticated encryption protocols for your wireless network. Find the best solution for network security work.

Wired Equivalent Protocol (WEP)

Wired Equivalent Protocol (WEP) is a wireless security protocol encrypted or encoded, that all network data before Toshiba Pa3535U-1BRS is transmitted, with a WEP key. Normally, you can assign to your setup to the network, the WEP key. alternatively, you can have your own key to generate a different key, or select other options. Without the correct password, the user may not use the wireless network the resource from battery4.us.

WPa (Wi-Fi Protected access)

Like WEP, WPa security settings are used to encrypt and decrypt data transmitted over the network. But instead of a static security key for WEP encryption, WPa uses Temporal Key Integrity Protocol (TKIP) dynamically generate a new key for each packet, and generate different types of keys for each team.

Connect your network

If possible, avoid the network name (SSID) broadcasting by the wireless transmitter. Most networks to transmit the default name, for example all computers in the vicinity of your network is available. By knowing the closure of the network, other Toshiba Pa3191U-1BRS computers, it is less likely that your network is available.

NOTE: If the network is closed and the SSID is not broadcast, you need to know or remember the SSID to connect new devices to the network. Enter the SSID off and store in a safe place before the closure of its network.

Safety in public places

Wireless networks in public areas or “hot spots” such as cafes and airports can be no security. New technologies are being developed by the Sony VGP-BPS9 laptop manufacturers and suppliers of Wi-Fi to make the public safe and anonymous environment. If you are concerned about the security of your computer in a warm place to limit their activities to the critical network e-mail and basic Internet surfing.

Hopes that help you by latops-battery.co.uk.

The charging of lithium-ion batteries C

March 26th, 2010

Despite all these preventive measures deep discharges always occur again. Therefore, advanced battery analyzers (Cadex Series 7000) with a “wake” function (boost), ruling that delivers a small charge current to activate the safety circuit when needed and provide the deep discharged cells again with energy. Followed by a full charge and an analysis of the Dell Inspiron 6400 Battery.

If the cell has remained for several days at a voltage of 1.5V/Zelle, but a charge should be avoided. Inside the cells may have been built up by some copper electrical connections that can lead to a partial or general electrical short circuit. The cell becomes unstable. The charging of such Dell Inspiron 640m Battery cells leads to severe overheating and the safety can not be guaranteed.

Battery experts agree that the loading of lithium-ion batteries are lighter and simpler than nickel-based batteries. Aside from the keeping of smaller voltage tolerances, the charging circuit with fewer variables to be considered to survive. Determining the full charge with a voltage limit and the monitoring of current saturation, which occurs for a full charge, is simpler than the analysis of multiple complex data as it produces nickel-metal hydride batteries. The charging currents are less critical and can vary. Only a small current still allows a clean definition of the full charge. The Dell Inspiron E1505 Battery simply requires a longer charging. The absence of the last brief charge, and the suspended load also helps to simplify the charger. Best of all is that there is no memory effect, but that actually represents only the aging of a difficulty.

The loading procedure of lithium-ion polymer is similar to that of lithium-ion. These Dell Inspiron 1520 Battery use a gel-Elekrtolyt to improve conductivity. In most cases, use lithium-ion and lithium-ion polymer battery chargers the same.

Measuring the state of charge based on the terminal voltage

The open circuit voltage can be used to estimate the state of charge of lithium, alkaline and lead batteries.

Unfortunately, this method is not applicable for nickel batteries.

A lithium-ion Dell inspiron 1545 battery cell, for example a no-load voltage of 3.8 V, there is a charge of about 50%. It should be noted that the use of the open circuit voltage to determine the state of charge is inaccurate, because the cells of different manufacturers have a slightly different voltage profile. This is because the chemical composition of the electrodes and the electrolyte from the manufacturers are different. The temperature also affects the battery voltage. The higher the temperature, the lower the voltage.