Understanding Analog and Digital Wireless TechnologiesUnderstanding Analog and Digital Wireless TechnologiesAdvanced Mobile Phone System or AMPS became commercially available in the 1980's. This was an analog service that communicated at 800 MHZ. This technology worked very similar to the way FM radios work. The sound or signal is transmitted to the nearest tower across the network to person on the receiving end of the call. This new technology was in its infancy and very expensive. This meant early cellular subscribers were doctors or other business professionals who had a decisive need to stay in constant communication no matter where they were.Eventually costs came down and in 1991 the Motorola Corporation invented what was known as Narrowband AMPS or NAMPS. This allowed the wireless providers to squeeze more calls on the existing network reducing infrastructure costs. This current plan is actually still in use today and many analog providers implement it to defer the costs of building a digital service. This additional capacity was still unable to fulfill the consumers need for more and better communication. In 1991 the first truly digital network Time Division Multiple Access (TDMA) went into service.When TDMA was implemented the capacity tripled compared to existing AMPS and NAMPS systems. This was possible because the signal was broken down in the digital language of computers, known as binary. In an analog system only one subscriber can occupy a communications pathway or channel, whereas digital allows multiple subscribers per channel, making it more cost effective to operate and run.In 1992 Code Division Multiple Access or CDMA became available. This technology surpassed the original analog and existing digital service. It allowed capacity to increase by a factor of 10 when compared to analog signals. CDMA networks were not fully implemented in 1995. Both CDMA and TDMA fall under the category of Personal Communication Services or PCS.Analog cellular service has been around for a much longer period of time then digital service and advantages. However the newer digital service has advantages as well and it's important to understand the differences between them.Analog cellular service has an established communication network infrastructure, or simply put you will be able to make a call from almost anywhere. As analog service remains intact from origin to destination the quality is consistent from point to point. Analog phones and plans are generally more expensive, and the phones will have fewer features.Digital phone have certain advantages as well. Generally speaking the calls are clearer than analog calls. As digital cellular plans allow a greater capacity they are generally cheaper to operate and run. This savings is passed on the consumer with a less expensive service offering a better value to the consumer. Digital services also offer a wider variety of phones with more advanced features such as caller ID and wireless internet access. Two additional points to consider are longer battery life and increased security of calls. Disadvantages are lack of coverage. While most metropolitan areas will have coverage some suburban or rural areas will not. This will mean you will incur out of plan or roaming charges, making it more expensive to use your phone. If your digital phone is not dual or tri band and you will not be able to use an analog signal to make a call. Lastly you should consider quality of signal. While this has been steadily improving in recent years when the digital signal is weak the quality of the call often makes communicating all but impossible.
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