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NTC 360 ShortAnswers--Week2--MWalker

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Week 2 – Short Answers
Class: NTC 360
Instructor: Stephen Omogbehin
Date: February 5, 2007
Rotary and Dual Tone Multi-frequency (DTMF) the difference between rotary telephones and dual
tone multi-frequency, or DTMF, telephones is in how the person dials the phone and how the phone
responds when the dialing occurs. According to Dean (2003), “In rotary dialing, a user chooses a number
and turns a wheel from that number to the finger stop (a small metal bar), then releases the wheel” (p.
197). A circuit opens in response to the wheel being moved and, when the user lets go of the wheel, a
series of pulses are issued because the circuit alternately opens a closes as the wheel returns to its
beginning state. The translation of the pulses into numbers occurs at the local central office’s switch.
For DTMF, the pressing of a certain button on the phone issues two frequencies that differ from pressing
any other button on the phone. The frequencies are translated into numbers by the central office’s switch,
which contains a DTMF receiver.
Wide Area Telecommunications Service (WATS) and leased lines – the difference between Wide Area
Telecommunications Service (WATS) and leased lines is in whom can connect to the lines. With WATS,
customers and other individuals can dial the number and reach the organization, no matter where in the
region the customer is placing the call; in contrast, leased lines form a point of contact with two specific
sites.
Private Branch eXchange (PBX) and Centrex – the equipment required to implement the switching in
Private Branch eXchange (PBX) is maintained onsite by the customer, where the equipment required for
Centrex is maintained by the local telephone company.
The layers of the International Standards Organization-Open Systems Interconnection (ISO-OSI)
model – the differences between the various layers of the OSI model include:
Application – transfers information from program to program
Presentation – handles text formatting and displays code conversion
Session – establishes, maintains, and coordinates communication
Transport – ensures accurate delivery of data
Network – determines transport routes and handles the transfer of messages
Data Link – codes, addresses, and transmits information
Physical – manages hardware connections (Dean, 2000)
References
Dean, T. (2000). Network + Guide to Networks. Cambridge, MA: Course Technology.
Dean, T. (2003). Guide to Telecommunications Technology. Retrieved from the University of Phoenix,
Week One, Resource, NTC360 – Network and Telecommunications Concepts Website:
https://ecampus.phoenix.edu/secure/resource/resource.asp
--
Michelle L. Walker
Email address: mishymu912@email.uophx.edu
Telephone number: 309-642-1042

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Week 2 - Short AnswersClass: NTC 360Instructor: Stephen OmogbehinDate: February 5, 2007Rotary and Dual Tone Multi-frequency (DTMF) - the difference between rotary telephones and dual tone multi-frequency, or DTMF, telephones is in how the person dials the phone and how the phone responds when t ...
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