Ntc360Essay Preview: Ntc360Report this essayCourse: NTC 360Use short answers to explain the difference between:Rotary and Dual Tone Multi-frequency (DTMF)Wide Area Telecommunications Service (WATS) and leased linesPrivate Branch eXchange (PBX) and CentrexThe layers of the International Standards Organization-Open Systems Interconnection (ISO-OSI) model1. Explain the difference between Rotary and Dual Tone Multi-frequency.The major difference between Rotary and Dual Tone Multi-frequency(DTMF) is the method by which they are executed to the phone system. Rotary uses interrupted pulses to communicate the characters or digits on the rotary dial. Rotary systems were different depending on the country in which it was used having certain amounts of pulses to represent certain digits on the rotary dial. For example, in the United States, dialing a number five on a rotary dial set would open and close electrical contacts on the phone five times thus sending five pulses. Dual Tone Multi-frequency(DTMF) also know as touch tone dialing is used by sending a combination of two tones over the phone system. An example of how these two tones are sent can be illustrated by these two tables taken from
DTMF keypad frequencies (with sound clips)1209 Hz1336 Hz1477 Hz1633 Hz697 Hz770 Hz852 Hz941 HzAn example of a combination of tones could be illustrated by selecting the number five on the keypad. In this example, when someone would dial the number five, two tones at 770 Hz and 1336 Hz would be sent.
DTMF Event FrequenciesEventLow frequencyHigh frequencyBusy signal480 Hz620 HzDial tone350 Hz440 HzRingback tone (US)440 Hz480 HzAn example from this table shows that when someone picks up their phone and hears a dial tone, two frequency are actually heard at 350 Hz and 440 Hz.References:2. Explain the differences between Wide Area Telecommunications Service (WATS) and leased lines.A Wide Area Telecommunications Service or WATS is “a special direct distance dialing (toll) service whereby a subscriber installs a dedicated line arranged for either inward or outward calls (not both) between the customers premises and a specific geographic area. Monthly charges are based on the size of the area in which the calls are placed, not on the number or length of calls.” (
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We understand the interest in this idea, but we want to see if there will be any benefits to the company’s customers. For example, the cost for these lines, plus possible lower frequency and higher strength of customer orders, could raise demand for those who prefer a lower frequency option.‟
http://www.WATTS.com
http://www.WATTS.com
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3. Explain the difference between Private Branch eXchange (PBX) and Centrex.Private Branch eXchane (PBX) is “a telephone system within an enterprise that switches calls between enterprise users on local lines while allowing all users to share a certain number of external phone lines.” (