Doctor Martin Cooper invented the modern cell phone. He invented the technology responsible for the cell phone when he was the Director of Research and Development at Motorola. Dr. Martin Cooper is also known as the first person to make a call on a cell phone. His revolutionary call took place in April of 1973 in New York. He is currently the CEO of an antenna corporation.The Cell Phone's Ancestors
The modern cell phone originated with Martin Cooper; however, in order to completely...
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Telephone wiring is easy to work with and very safe, due to the low voltages involved.
The most complex part of installing telephone wiring is complying with the defined standards in place.
When installing additional telephone wiring into an existing facility, it is usually best to determine which telephone wiring standard is currently in use and conform to that standard.
When installing telephone wiring into a new facility, EIA/TIA T586A is the standard to utilize. How the Wire...
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The beginning history of cell phones is based upon radio technology that was developed from the 1940's onward. For instance the beginning of cell phones can be traced to the innovation in taxi cabs, police cars and other service vehicles where two way radios were used to communicate with one another or with a central base. Early cell phone communication technology could be even traced back to individuals with special radios that can patch into a phone line via live operator to make a...
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GSM phones are designed to be used with any network. However, some service providers electronically lock their phones when giving out special offers, gifts or discounted prices so that one has to stick to the particular provider. This can be to your disadvantage since you may have to pay very high roaming charges when you take your phone out of their network and use it elsewhere in the world. Fortunately, SIM locked phones can be reversed. The copyright office gave the green light to...
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BlackBerry's are sold by many wireless providers across the globe, including AT&T/Cingular, T-Mobile, Vodafone and Verizon.
When these companies sell a BlackBerry, they do so at a discount in order to attract customers. The providers then make up the lost profits over the lifetime of the contract signed by the customer.
To protect those profits, the wireless providers configure a "subsidy lock" into each BlackBerry. The subsidy lock prevents the BlackBerry from being...
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You often might have had the frustrating experience of the inability to talk on your cell phone due to weak signals in the so-called "cellular dead zones". What could you do in such situations? Cell Phone Signal Boosters Will Do the Magic!
Installing a cell phone signal booster will solve the problem for you! Also known as cellular repeaters or amplifiers, cell phone signal boosters will reduce the number of dropped calls and even help you extend your cell phone range. Long...
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GSM (Global System for Mobile communication) is a digital mobile telephone system that is widely used in Europe and other parts of the world. GSM uses a variation of Time Division Multiple Access (TDMA) and is the most widely used of the three digital wireless telephone technologies (TDMA, GSM, and CDMA). GSM digitizes and compresses data, then sends it down a channel with two other streams of user data, each in its own time slot. It operates at either the 900 MHz or 1,800 MHz frequency...
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Cell phone cloning refers to the act of copying the identity of one mobile telephone to another.
This is usually done to make fraudulent telephone calls. The bill for the calls go to the legitimate subscriber. This had made cloning very popular in areas with large immigrant populations, where the cost to "call home" was very steep. The cloner is also able to make effectively anonymous calls, which attracts another group of interested law-breakers.
Cell phone cloning started...
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TTY/TDD stands for a group of telecommunication devices that make it easier for deaf and/or mute people to talk over telephone lines. TTY stands for telephone typewriter, teletypewriter or text phone. TDD stands for Telecommunications Device for the Deaf. Usually these devices are all categorized under TTY/TDD. Sometimes TTY means manual devices such as typewriters, TDD devices usually fall under computer assisted or digital devices.
For the most part, a TTY/TDD device is the size of a...
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46/49MHz Cordless Phone frequencies
Here are the frequencies for the first generation 46/49MHz cordless phones.
Channel Handset Frequency Base...
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