**FOR YOUR SAFETY USING CELLPHONE**

SWITCH ON SAFELY Do not switch the phone on when wireless phone use is prohibited or when it may cause interference or danger. ROAD SAFETY COMES Obey all local laws. Always keep your hands free to operate the vehicle while driving. Your first consideration while driving should be road safety. INTERFERENCE All wireless phone may be subject to interference, which could affect performance. SWITCH OFF IN HOSPITALS Follow any restrictions. Switch the phone off near medical equipment. SWITCH OFF IN AIRLINES Follow any restrictions. wireless device can cause interference in aircraft. SWITCH OFF WHEN REFUELLING Don't use the phone at a refuelling point. Don't use near fuel or chemicals. SWITCH OFF WHEN BLASTING Follow any restrictions. Don't use the phone where blasting is in progress. USE SENSIBLY Use only in the normal position as explained in the product documentation. Don't touch the antenna unnecessarily. QUALIFIED SERVICE ONLY Qualified personnel may install or repair to all products. ENHANCEMENT AND BATTERIES Use only approved enhancements and batteries. do not connect incompatible products to your cellphone. WATER RESISTANCE Your phone is not water resistance. Keep it dry. BACK-UP COPIES Remember to make back-up copies or keep a written record of all important information stored in your phone. CONNECTING TO OTHER DEVICES When connecting to any other device, read its user guide for detailed safety instructions. Do not connect incompatible products.

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Saturday, February 21, 2009

Cellular Networks

The cells in a cellular radio network refer to the coverage area of each tower that receives and transmits calls from mobile telephones. The cells are arranged in a honeycomb pattern, and they overlap so that the system can handle increases in anticipated telephone traffic volume.

Network management functions, performed by computers at a central facility known as a Mobile Telephone Switching Office (MTSO), include the ability to measure and compare the transmission quality between a single handset and multiple towers. This function is important so that the MTSO can select the best transmission link between mobile telephones and towers. This optimal link is then used to pass transmissions from one tower to another as the mobile telephone moves between cells.

All cell towers in a given area connect with the MTSO, which in turn has links to the wire-based local exchange carrier that handles normal telephone calls. The link between the MTSO and the wire-based local telephone company is essential for connecting wireless and wire-based calls. The vast majority of calls handled by a cellular radio network either begin on the wire-based network or end there.

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