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This 0 page Study Guide was uploaded by tophomework Notetaker on Wednesday November 11, 2015. The Study Guide belongs to a course at a university taught by a professor in Fall. Since its upload, it has received 16 views.
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Date Created: 11/11/15
Week 2 Short Answers Class NTC 360 Instructor Stephen Omogbehin Date February 5 2007 Rotary and Dual Tone Multifrequency DTMF the difference between rotary telephones and dual tone multifrequency 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 OrganizationOpen Systems Interconnection ISOOSI 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 I 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 httpsecampusphoenixedusecureresourceresourceasp lvlichelle L Walker Email address mishymu912emailuophxedu Telephone number 3096421042
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