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Case Study Just to Join

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DATA COMMUNICATIONS

First Semester 2012-2013

CMSC 137 Data Communications and Networking ICS-UPLB

JAC Hermocilla

Data Communications


Communication involves information sharing : local or remote Telecommunication – communication at a distance




telephony, telegraphy, television



Data communications – the exchange of data between devices via some form of transmission medium such as wire cable


data - information presented in whatever form agreed upon by parties creating and using data



Devices must be part of a data communications system (DCS) , a combination of hardware and software

First Semester 2012-2013

CMSC 137 Data Communications and Networking ICS-UPLB

JAC Hermocilla

Effective DCS


Delivery


Must deliver data to the correct destination Must deliver data accurately Must deliver data in a timely manner Must consider variations in the packet arrival time
CMSC 137 Data Communications and Networking ICS-UPLB JAC Hermocilla



Accuracy




Timeliness




Jitter


First Semester 2012-2013

Components of a DCS (1)


Message


Information to be communicated Device that sends the message: computer, phone Device that receives the message: computer, phone Physical path by which a message travels from sender to receiver: twisted-pair wire, coaxial cable, fiber optics, radio waves A set of rules that govern data communications An agreement between the communicating devices



Sender




Receiver




Transmission Medium




Protocol
– –

First Semester 2012-2013

CMSC 137 Data Communications and Networking ICS-UPLB

JAC Hermocilla

Components of a DCS (2)

First Semester 2012-2013

CMSC 137 Data Communications and Networking ICS-UPLB

JAC Hermocilla

Data Representation (1)


Text
– –

Bit pattern, sequence of 0's and 1's

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