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Overview of Voice

Overview of Voice. Telephones Transmission media Switching Signaling to control everything. Telephone Networks. 1. Station apparatus 2500 set Digital set What else? 2. Transmission media CO, DID, T1, DS3, what else? 3. Switching PBX, Central office, long distance

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Overview of Voice

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  1. Overview of Voice

  2. Telephones • Transmission media • Switching • Signaling to control everything Telephone Networks

  3. 1. Station apparatus • 2500 set • Digital set • What else? 2. Transmission media • CO, DID, T1, DS3, what else? 3. Switching • PBX, Central office, long distance 4. Controlling the network (signal that tell the equipment where to route the calls) Basics of a Telephone network

  4. Sound is also a type of wave that we cannot see. Like ocean waves, sound waves something to travel through like waves through the ocean or through a flag. Sound can travel through air because air is made of molecules. These molecules carry the sound waves by bumping into each other, like dominoes knocking each other over. Sound can travel through anything made of molecules - even water! There is no sound in space because there are no molecules there to transmit the sound waves. C/O: • http://science.hq.nasa.gov/kids/imagers/ems/waves.html Definition of sound

  5. Definition of bandwidth: The width of the frequencies that comprises a signal or; the French mathematician Fourier: “any complex waveform can be decomposed into the sum of pure tones, or sine waves, at different frequencies and with different maximum, amplitudes and phases. A graphical plot of the frequencies that comprise a signal, or that are passed by a communication channel, is called the spectrum.” Bandwidth

  6. According to the text on page 6. Each telephone speech signal occupies a frequency spectrum from about 300 to 3,300 Hz (Hertz / cycles per second). • Typically know as 300 to 3000 for voice. Voice Bandwidth

  7. Transmission, switching and signaling • Local loop • Central office to a POP • POP to Toll network • Trunking • Toll network to POP • POP to CO • Destination Behind the scenes

  8. Simply defined: The pair of wires running from your home (premise) to the local telephone company (CO or central office). • CPE to - • intra-premise wiring to - • Demark • Protector block ( fuses, spark gaps ) to - • Local loop (pair of wires running back to the CO) Local Loop

  9. Incoming lines from the CO to the PBX (demark) • CO • DID • PRI • DS1 • PBX to the individual stations • Wiring center’s purpose Basics on Wiring within a facility

  10. Cabling within a facility MDF IDF STATION EXAMINE THE RELATIONSHIP BETWEEN THE VOICE NETWORK – INTERNAL AND EXTERNAL VERSUS THAT OF A DATA NETWORK DATA COMMUNICATIONS AND HOW NETWORKS EVOLVED infrastructure

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