Management Information Systems Chapter 6

why learn about telecommunications and networks?
effective communication – essential to the success of every major human undertaking

regardless of your chosen career field, you will need the communications capabilities provided by telecommunications and networks.

is the electronic transmission of signals for communications

telecommunications medium is any material substance that carries an electronic signal to support communication between a sending and receiving device

networking protocol is a set of rules, algorithms, messages, and other mechanisms that enable software and hardware in networked devices to communicate effectively

synchronous communications
receiver gets message instantaneously
asynchronous communications
receiver gets message after some delay
simplex channel
transmits data in only one direction
half duplex channel
transmits data in either direction but not simultaneously
full duplex channel
permits data transmission in both directions at the same time
channel bandwidth
rate at which data is exchanged, measured in bits per second
circuit switching network
sets yp a circuit between the sender and receiver before any communication can occur
packet switching network
no fixed path is created between the communicating devices
telecommunications media
categories: guided transmission media and wireless
twisted-pair wire
classified by category: 2, 3, 5, 5e, and 6.,
twisted pairs of copper wire, shielded or shielded.

used for telephone service, widely available,

transmission speed and distance limitations

Coaxial cable
offers cleaner and crisper data transmission than twisted pair wire (less noise)
inner conductor wire surrounded by insulation

cleaner and faster data than twisted pair wire,

more expensive thatn twisted pair wire

fiber optic cablef
transmits signals with light beams
many exr
BREAK pg 12 fill in on media channels