Connections

1
Connections

• by
• Jaime Burkhalter
• (A.K.A. Gerald Knezek)
• Professor of Technology Cognition
• University of North Texas

2
Telecommunications

• Tele - at a distance
• Communications - exchange of information

3
Computer Networks

• DAN
• Desktop Area Network
• Cluster
• less than 30 machines
• near to each other (cont
  inued)

4

• (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

5
Internet

• Network of networks
• All use TCP/IP protocols
• Support basic services
• Email (SMTP)
• Telnet
• FTP (continued)

6

• (continued)
• Supports numerous servers and clients
• JOVE Unix system at UNT, Tenet in Austin
• Listservs
• Gopher, WWW, etc.

7
Equipment for Interactive Access to Basic
Services(Real-Internet-Time)

• Personal Computer
• Modem
• (modulator - demodulator) (conti
  nued)

8

• (continued)
• Terminal Emulation Software
• ProComm (IBM)
• Zterm (Mac)
• Phone Line

9
Modem Communication Concepts

• Local Echo
• Originate vs. Answer Mode
• Serial vs. Parallel Transmission
• (continued)

10

• (continued)
• Start and Stop Bits
• Transmission Speed (baud vs. bps)
• Parity
• Handshaking
• Terminal Types

11
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) (continued)

12

• (continued)
• ftp
• Email Gateway
• Await file delivery

13
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
• (continued)

14

• (continued)
• Must have Provider-Client Link (TCP/IP)
• SLIP
• PPP (Preferred Service available at UNT)
• Wireless (experimental)

15
High Speed vs. Low Speed Lines

• Low Speed Lines
• 28.8 bps
• Medium Speed Lines
• ISDN (64 kbps)
• High Speed Lines
• T1 (1.44 Mbps)

16

• The End