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Analog Digital
Features of an Analog Telephone Station
There are three major types of telephone stations currently available to business owners: digital, analog and VoIP. Digital phone stations are the most popular with IP telephones rapidly gaining ground, but analog telephone stations still have specific uses in business communications. Read on to learn about the features of an analog telephone station so you can make an informed decision for your business.
The main difference between analog and digital phone stations is the way an audio signal, or voice, is transmitted to the other end. An analog phone turns the voice into electronic pulses that create vibrations in the receiver's speaker which can be heard as the voice. Conversely, digital telephones typically sample the audio signal via some form of Time Division Multiplexing (TDM) to transfer the audio signal. By sampling the signal, digital telephones use less bandwidth on a telephone line.
Analog telephone stations have been in use for decades making their technology much older than digital but still reliable and easy to use. Since an analog phone doesn't use digital sampling, it is unable to compress data as efficiently as a digital phone. Therefore, analog technology consumes the entire circuit when in use. This makes it impossible for multiple phone calls to be made at one time. This is also true for analog phones connected to a phone system or network. If you own a smaller business, this may not be an issue. Larger businesses, however, have the need to make multiple calls at once and take advantage of added telephony features thus requiring digital telephone stations.
One major advantage of an analog telephone station is the cost. Compared to digital phones, analog phones are much less expensive. This can mean great savings when considering cheaper telephones for common areas like lobbies, employee break rooms, and waiting rooms. In addition, analog telephones are not the only devices that can be connected to an analog station port. Other common analog devices include desktop and tabletop conferencing phones, fax machines, credit card terminals, and modems. When one of these devices is needed, you should make sure that an analog station port is available on your phone system.
Most phone systems manufactured today can accommodate analog, digital, and IP telephone stations. Depending on the configuration of the system, you may need to add a card or module to your PBX to use an analog device. In any event, you can consult with your telephone installation professional just to make sure.
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What would happen if a digital signal is fed to an Analog to Digital converter?
I would like to know what would happen to a digital signal if it is sent to an analog to digital converter? Will the signal pass through unchanged or will there be any changes in the signal?
It will be digitized, subject to the voltage limits, precision and frequency limitations of the A2D converter.
For example, if your A2D acquires 5K samples/second over a voltage range from 0 to 4 volts with a precision of 8 bits, and you feed in a digital signal that varies between 0.5 and 2.5 volts, and consists of pulses that are 1 ms wide, at a repetition rate of 500 pulses/s, the A2D output might look like this (in decimal):
31, 32, 31, 30, 32, 90, 164, 160, 162, 161, 104, 29, 31, 30, 32, 95, 163, ...
If you plot the numbers on a graph you'll see a rough reconstruction of the original wave.
In practice, digitizing signals with sharp edges (such a digital signals, but also many analog signals from sensors) requires careful attention to the frequency content of the signal. This is normally done by applying a low-pass filter to the signal before digitization.
Analog or Digital? (1993)