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Telephone - Cellular phone | A Wisdom Archive on Telephone - Cellular phone | | Telephone - Cellular phone A selection of articles related to Telephone - Cellular phone | |
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Telephone, Telephone - Cellular phone, Telephone - Cordless telephone, Telephone - Cordless/mobile phone, Telephone - Digital Telephony, Telephone - History, Telephone - Introduction, Telephone - Later history, Telephone - Patents, Telephone - Telephone Standards, Telephone - Telephone equipment, Telephone - Telephone equipment manufacturers, Telephone - Telephone equipment research labs, Telephone - Telephone hacking and exploitation, Telephone - Telephone operating companies, Telephone - Telephone system, organization, and structure, Telephone - Telephone technology, Telephone - Telephone terminology, Telephone - Trivia, Telephone - US-specific terminology, Telephone - VoIP Telephony, Telephone - Wireless phone systems, 431A, 610, Answering machine, Cordless telephone, Emergency telephone, Modem, Payphone, Pen register, Photophone, Telautograph, Telecommunications Device for the Deaf (TDD or TTY), Telegraph, Switchboard, Telex, Teletype, Electronic Switching System
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ARTICLES RELATED TO Telephone - Cellular phone | |
| | |  Telephone - Cellular phone: Encyclopedia II - Telephone - VoIP Telephony
Also known as Internet telephony or Voice over IP (VoIP), digital telephony is a disruptive technology that is rapidly replacing traditional telephone networks. In Japan and Korea up to 10% of subscribers, as of January 2005, have switched from analog to digital telephone service. A recent Newsweek article suggested that Internet telephony may be "the next big thing." [2]
Digital telephones use a broadband Internet connection to transmit conversations as data packets. In addition to replacing the PSTN, digital telephony is also compet ...
See also:Telephone, Telephone - Introduction, Telephone - History, Telephone - Early development, Telephone - Later history, Telephone - Digital Telephony, Telephone - Wireless phone systems, Telephone - Cordless telephone, Telephone - Cellular phone, Telephone - Cordless/mobile phone, Telephone - VoIP Telephony, Telephone - Telephone equipment research labs, Telephone - Telephone operating companies, Telephone - Trivia, Telephone - Telephone equipment, Telephone - Telephone equipment manufacturers, Telephone - Telephone technology, Telephone - Telephone system organization and structure, Telephone - Telephone hacking and exploitation, Telephone - US-specific terminology, Telephone - Telephone terminology, Telephone - Telephone Standards, Telephone - Patents Read more here: » Telephone: Encyclopedia II - Telephone - VoIP Telephony |
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| | | | Telephone - Cellular phone: Encyclopedia II - Telephone - History The very early history of the telephone is a confusing morass of claim and counterclaim, which was not clarified by the huge mass of lawsuits which hoped to resolve the patent claims of individuals. There was a lot of money involved, particularly in the Bell Telephone companies, and the aggressive defense of the Bell patents resulted in much confusion. Additionally, the earliest investigators preferred publication in the popular press and demonstration to investors instead of scientific publication an ...
See also:Telephone, Telephone - Introduction, Telephone - History, Telephone - Early development, Telephone - Later history, Telephone - Digital Telephony, Telephone - Wireless phone systems, Telephone - Cordless telephone, Telephone - Cellular phone, Telephone - Cordless/mobile phone, Telephone - VoIP Telephony, Telephone - Telephone equipment research labs, Telephone - Telephone operating companies, Telephone - Trivia, Telephone - Telephone equipment, Telephone - Telephone equipment manufacturers, Telephone - Telephone technology, Telephone - Telephone system organization and structure, Telephone - Telephone hacking and exploitation, Telephone - US-specific terminology, Telephone - Telephone terminology, Telephone - Telephone Standards, Telephone - Patents Read more here: » Telephone: Encyclopedia II - Telephone - History |
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| | | | Telephone - Cellular phone: Encyclopedia II - Cellular network - Broadcast messages and paging Practically every cellular system has some kind of broadcast mechanism. This can be used directly for distributing information to multiple mobiles, commonly, for example in mobile telephony systems, the most important use of broadcast information is to set up channels for one to one communication between the mobile transceiver and the base station. This is called paging.
The details of the process of paging vary somewhat from network to network, but normally we know a limited number of cells where the phone is located (this gro ...
See also:Cellular network, Cellular network - General characteristics, Cellular network - Broadcast messages and paging, Cellular network - Frequency reuse, Cellular network - Movement from cell to cell and handover, Cellular network - Cell coverage area, Cellular network - Cellular telephony Read more here: » Cellular network: Encyclopedia II - Cellular network - Broadcast messages and paging |
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| | | | Telephone - Cellular phone: Encyclopedia II - Cellular network - Frequency reuse The increased capacity in a cellular network, comparing to a network with a single transmitter, comes from the fact that the same radio frequency can be reused in a different area for a completely different transmission. If there is a single plain transmitter, only one transmission can be used on any given frequency. Unfortunately, there is inevitably some level of interference from the signal from the other cells which use the same frequency. This means that, in a standard FDMA system, there must be at least a one ce ...
See also:Cellular network, Cellular network - General characteristics, Cellular network - Broadcast messages and paging, Cellular network - Frequency reuse, Cellular network - Movement from cell to cell and handover, Cellular network - Cell coverage area, Cellular network - Cellular telephony Read more here: » Cellular network: Encyclopedia II - Cellular network - Frequency reuse |
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| | | | Telephone - Cellular phone: Encyclopedia II - Cellular network - Cell coverage area The ideal cellular network, shown in textbooks, has hexagonal cells would want to cover such an area. In practise, cell coverage varies considerably according to the terrain, the siting of the cell's antenna, intervening buildings, landmarks and barriers.
The other factor which influences cell coverage considerably is the frequency of the radio signal used. Simply put, lower frequencies tend to penetrate through obstacles well, whilst higher frequencies tend to be stopped by thin objects. For example, a five millimetre plaster board wall will completely stop light, bu ...
See also:Cellular network, Cellular network - General characteristics, Cellular network - Broadcast messages and paging, Cellular network - Frequency reuse, Cellular network - Movement from cell to cell and handover, Cellular network - Cell coverage area, Cellular network - Cellular telephony Read more here: » Cellular network: Encyclopedia II - Cellular network - Cell coverage area |
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| | | | Telephone - Cellular phone: Encyclopedia II - Cellular network - Movement from cell to cell and handover The use of multiple cells means that, if the distributed transceivers are mobile and moving from place to place, they also have to change from cell to cell. The mechanism for this differs depending on the type of network and the circumstances of the change. For example, if there is an ongoing continuous communication and we don't want to interrupt it, then great care must be taken to avoid interruption. In this case there must be clear coordination between the base station and the mobile station. Typically such systems use some kind of multi ...
See also:Cellular network, Cellular network - General characteristics, Cellular network - Broadcast messages and paging, Cellular network - Frequency reuse, Cellular network - Movement from cell to cell and handover, Cellular network - Cell coverage area, Cellular network - Cellular telephony Read more here: » Cellular network: Encyclopedia II - Cellular network - Movement from cell to cell and handover |
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| | | | Telephone - Cellular phone: Encyclopedia II - Emergency telephone number - Emergency numbers and mobile/wireless/cellular telephones The GSM mobile phone standard includes 112 as an emergency number, no matter what other local emergency number are applicable. This is valuable for foreign travelers, who may not know a local one.
Using 112 instead of another emergency number on a GSM phone may be advantageous, since 112 is recognized by all GSM phones as an emergency number. A phone dialing a different emergency services number may refuse to roam onto another network, leading to trouble if there is no access to the home network. Dialing 112 forces the phone to ...
See also:Emergency telephone number, Emergency telephone number - Use of emergency numbers, Emergency telephone number - Configuration and operation, Emergency telephone number - Emergency numbers by region, Emergency telephone number - Africa, Emergency telephone number - Australasia, Emergency telephone number - Asia, Emergency telephone number - Europe, Emergency telephone number - North America, Emergency telephone number - South America, Emergency telephone number - Middle East, Emergency telephone number - History of emergency services numbers, Emergency telephone number - Emergency numbers and mobile/wireless/cellular telephones, Emergency telephone number - Notes Read more here: » Emergency telephone number: Encyclopedia II - Emergency telephone number - Emergency numbers and mobile/wireless/cellular telephones |
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| | | | Telephone - Cellular phone: Encyclopedia II - Mobile phone - Terminology
Mobile phone - Mobile phone terms.
Brick
A large, heavy, and usually obsolete wireless mobile phone, such as the Motorola International 3200.
Candybar
A housing shape that has no hinges and resembles an oblong candy bar (US).
Cell phone, cellular telephone or Cell
Term used currently in the United States and Canada (and in other countries as well during the 1980s) to refer to most mobile phones. It technically applies specifically to mobile phon ...
See also:Mobile phone, Mobile phone - Worldwide deployment, Mobile phone - Mobile phone culture, Mobile phone - Mobile phone features, Mobile phone - Technology, Mobile phone - Controversy, Mobile phone - Health controversy, Mobile phone - Driving controversy, Mobile phone - Security concerns, Mobile phone - Future prospects, Mobile phone - Terminology, Mobile phone - Mobile phone terms, Mobile phone - Related systems which are not cellphones, Mobile phone - Terms in other countries, Mobile phone - Integrated devices Read more here: » Mobile phone: Encyclopedia II - Mobile phone - Terminology |
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| | | | Telephone - Cellular phone: Encyclopedia II - Emergency telephone number - Emergency numbers by region There is no world-wide emergency number.
Emergency telephone number - Africa.
Chad: Fire: 18, Police: 17
Djibouti: Fire: 18, Police: 17
Ghana: Emergency: 999, Police: 191, Fire: 192, Ambulance: 193
Morocco: Fire: 15, Police (city): 19, Royal military police (country): 177
South Africa: Police or Fire: 10111, Ambulance: 10177, From mobile phones: 112 (soon also from fixed line phones)
Tunisia: Emergency me ...
See also:Emergency telephone number, Emergency telephone number - Use of emergency numbers, Emergency telephone number - Configuration and operation, Emergency telephone number - Emergency numbers by region, Emergency telephone number - Africa, Emergency telephone number - Australasia, Emergency telephone number - Asia, Emergency telephone number - Europe, Emergency telephone number - North America, Emergency telephone number - South America, Emergency telephone number - Middle East, Emergency telephone number - History of emergency services numbers, Emergency telephone number - Emergency numbers and mobile/wireless/cellular telephones, Emergency telephone number - Notes Read more here: » Emergency telephone number: Encyclopedia II - Emergency telephone number - Emergency numbers by region |
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