Chapter 6. Telecommunications and Networks. Presentation Overview. The Evolution of Networking Data Transmission Characteristics Communications Media Network Classifications Network Topologies Network Hardware Network Software Communications Software and Protocols.
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Telecommunications and Networks
What are the characteristics of transmitted data?
External modem – stand-alone device connected by cable to a computer
Integrated Services Digital Network (ISDN) Lines are used to dial into the Internet and receive information at high speeds.
Digital Subscriber Lines (DSL) use existing phone lines and new switched connections to get faster speeds than traditional phone access.
T Linesare digital, high-speed, long-distance lines capable of carrying signals across the line.Communications Media
Networking paths allow networkedclient computers to send information to a server, which relays information back to the computer or to another on the network. Fax machines and printers are shared resources. The file server accesses a shared hard disk.
Local area network (LAN)is a private network using a file server that houses all networkresources.
Wide area network (WAN)spans a large geographical area connecting two or more LANs.
An intranetis a network within an organization to serve internal users.
In peer-to-peer architecture, computers act as both client and server.
Ring Topology has no hub, and each computer is connected to two other computers in a circular path.
Star Topology links multiple computers and devices to a central hub in a configuration resembling a star.
Hubs, Switches, Routers
devices that links computers in a network
A gatewayis a combination of hardware and software that allows dissimilar networks to communicate.
A bridge is a combination of hardware and software that enables devices on similar networks to communicate
Network Operating Systems (NOS)
Communication software programs can be used to
What are protocols?
With simplex data transmission, data flows only one way.
With half-duplex data transmission, data flows in both directions but only in one direction at a time.
With full-duplex data transmission, data flows in both directions at the same time.
Synchronous Transmission Protocols
blocks of bytes are wrapped in a start and stop byte called a synch byte.
Asynchronous Transmission Protocols
each byte of data is surrounded by control bits:
Local Area Network (LAN) Protocols
Circuit Switching / Packet Switching
Internet and Web Protocols
Electronic Mail Protocols
Variations of the 802.11 protocol
802.11 n 2007 600 Mbps
Based on the information presented in this chapter and your own experience, what do you think is on the horizon?