Transcript PowerPoint Presentation - Connections - Courseweb

Connections
by
Jaime Burkhalter
(A.K.A. Gerald Knezek)
Professor of Technology & Cognition
University of North Texas
Telecommunications
 Tele
- at a distance
 Communications
- exchange of information
Computer Networks

DAN
•

Desktop Area Network
Cluster
•
•
less than 30 machines
near to each other
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(continued)



LAN
•
local area network
•
less than 9 miles
MAN
•
metropolitan area network
•
less than 50 miles
WAN
•
•
wide area network
greater than 50 miles
Internet
 Network
 All
use TCP/IP protocols
 Support
•
•
•
of networks
basic services
Email (SMTP)
Telnet
FTP
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(continued)

Supports numerous servers and clients
•
•
•
JOVE Unix system at UNT, Tenet in Austin
Listservs
Gopher, WWW, etc.
Equipment for Interactive Access
to Basic Services
(Real-Internet-Time)
 Personal
Computer
 Modem
(modulator - demodulator)
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(continued)
 Terminal
•
•
Emulation Software
ProComm+ (IBM)
Zterm (Mac)
 Phone
Line
Modem Communication
Concepts
•
Local Echo
•
Originate vs. Answer Mode
•
Serial vs. Parallel Transmission
(continued)
(continued)
•
Start and Stop Bits
•
Transmission Speed (baud vs. bps)
•
Parity
•
Handshaking
•
Terminal Types
Distributed Modes of Basic
Services
 Not
Real-Internet-Time (NRIT)
 Email
•
•
POP Mail (Post Office Protocol, DOS/UNIX
Environments)
Eudora (GUI POP-like system for Mac)
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(continued)
 ftp
•
•
Email Gateway
Await file delivery
Interactive Access to Full Internet
Services
 High
Speed Line Preferred
 Personal
•
•
•
Computer must be ITI
(In the Internet)
must have IP address
129.120.20.127 for example
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(continued)
 Must
•
•
•
have Provider-Client Link (TCP/IP)
SLIP
PPP (Preferred Service available at UNT)
Wireless (experimental)
High Speed vs. Low Speed Lines
 Low
•
Speed Lines
28.8 bps
 Medium
•
ISDN (64 kbps)
 High
•
Speed Lines
Speed Lines
T1 (1.44 Mbps)
The End