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BMIS FINAL REVIEW I- Telecommunications, Networks, internet Telecommunication system: hard and software that transmit information from one location to another o Includes: hardware, media, network, software, application Telecommunication signals o Analog signal: Continuous waves Information is conveyed by the changing waves( amplitude and frequency) o Digital Signal Discrete pulses Information conveyed in binary form Easily understood by compute Modem: a device that converts analog into digital and vise versa Wire based communication o Twisted pair wire( telephone wire Cheap, slow, low security, easy to work with o Coaxial cable Carried more data More expensive/low security Hard to work with o Fiber optic cable Transmits information at light wave speed Fast/secure/no interference Hard to work with Wireless communication o Microwave High capital/ inexpensive Requires sight transmission towers Has to deal with environmental interference o Satellite Very high capacity- large converge area Expensive Requires encryption for security o Radio Used for short distances/inexpensive/easy to install/high speed Insecure/ has to deal with interferences Bandwidth: the transmission capacity of a communication channel o Examples: High band-with( cable TV; DSL)
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Low band-with (telephone system) Communication Protocols: transferring data from one network node to another o Divides message into packets o Affixing addresses to packets o Initiating transmission o Regulating flow of data o Check for errors o Acknowledge receipt of transmitted data Communication Protocols: a packet is a parcel of data that is sent across a computer network Network Basics Network: the communication devices, media and software needed to connect two or more computer systems o Local areas networks( LANS): a network that spans relatively small geographic distance o Wide area networks(WANS): network that spans a large geographic distance o Types of Networks Phone network Energy network Cell network Cable network Computer network Wide Area Network o Service provided by common carries o Internet s a public WAN o Value-added networks (VANS): private, data only network managed by third party- accessible only through subscription o Virtual-private network(VPN): secure network between corporate systems and the internet o REFER TO DRAWINGS Network Communication Software o Protocols Ethernet TCP-IP ( transmission control protocol/internet protocol
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