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Networks and Telecommunications

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Networks and Telecommunications. Telecommunications Media. Twisted pair ... tracks user data e.g. IDs and passwords. Network client software (on workstation) ... – PowerPoint PPT presentation

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Title: Networks and Telecommunications


1
Networks and Telecommunications
2
Telecommunications Media
  • Twisted pair (RJ-11 RJ-45)
  • Advantages
  • Disadvantages
  • Coax
  • Fiber-optic

3
Communication channels their capacities
4
Capacities of other communication media
5
Telephone company connection choices
6
Telecommunications Media-wireless
  • Microwave
  • Satellite
  • Cellular
  • Infrared laser

7
Transmission Modes
  • Simplex
  • Half-duplex
  • Full-duplex
  • Echoplex (re-x-mit for check)

8
The signal
  • Analog
  • Digital
  • Modems
  • Serial vs. parallel
  • Asynchronous vs. synchronous (character vs. block
    per unit time!)

9
Networks
  • A computer network is a collection of computers
  • and other devices that communicate to share data,
  • hardware and software.
  • LANs
  • topologies
  • protocols (polling vs. contention vs. token)
  • WANs
  • PBXs
  • gateways vs. bridges (dissimilar vs. similar)

10
What sort of resources does a LAN provide?
Network nodes include workstations printers,
and servers.
11
Networks
  • Logging in
  • Network administrators
  • Workstation gains access to the server when the
    server hard drive is mapped to a drive letter.
  • Drive mapping - network term for assigning a
    drive letter to a network server disk drive.
  • many use the letter F

12
LANs
  • When you start a program that is stored on a LAN,
    the program is copied to your workstations RAM,
    then runs normally.
  • With proper licensing, many users on the same
    network can use the same program simultaneously,
    also known as sharing.
  • Sharing is effective because
  • less disk storage space required
  • easier to update software
  • less expensive

13
LAN topologies
  • Ring
  • Bus
  • Star
  • Hierarchical
  • Hybrid

14
LANs
  • File locking
  • To access other printers on a network,
  • install its driver software.
  • Default printer
  • Another way to select a different printer is from
    within an application

15
LAN Hardware
  • Hubs
  • To connect workstations
  • together and then
  • to the server
  • Server types
  • dedicated servers
  • non-dedicated servers
  • print servers
  • application servers
  • host computers

16
Dedicated file server
  • Which of the servers processes my data?
  • Dedicated server delivers programs and data files
    to workstations.
  • It does not process data or run programs for
    workstations.

17
Dedicated file server
18
Non-dedicated file server
  • Which of the servers processes my data?
  • A non-dedicated file server is a computer on a
    network that performs a dual role as both file
    server and workstation processes the data
  • also called peer-to-peer capability
  • Print server - receives files from workstations
    and forwards them to a specific network printer
  • A print server manages a print queue, a holding
    area for files waiting to be printed.

19
Non-dedicated file server
20
Application server
  • A computer that runs a specific application
    software package also processes data
  • also referred to as client/server architecture
  • An application server splits processing between
    the workstation (client) and the network
    (server).

21
Application server
An application server typically runs database
software and performs database functions as
requested by the workstations.
22
Host computers
  • A minicomputer or a mainframe with attached
    terminals.
  • all processing takes place on the host
  • terminals only display results of processing
  • also known as a time-sharing system
  • MSCDs Clem is a host computer (see Pine, Clems
    own mail system, or Pico, Clems own editor)
  • Terminal emulation software connects a
    microcomputer to a host (see Telnet)

23
Network software
  • Network operating system (NOS) software
  • manages network resources
  • controls flow of data
  • maintains security
  • tracks user accounts
  • Network operating system has two components
  • network server software
  • network client software

24
Network Operating System (NOS)
  • Network server software (on file server)
  • controls file access from the servers hard disk
  • manages print queue
  • tracks user data e.g. IDs and passwords
  • Network client software (on workstation)
  • gathers login information
  • handles drive mapping
  • directs printouts to network printer

25
LANs
  • Can single user s/w be installed on networks?
  • Is it legal? Depends.
  • Do single user s/w have network capabilities?

26
Can two or more people work together on the same
data file?
  • Groupware is an application software that
    supports collaborative work by managing
  • schedules
  • shared documents
  • intra-group communications
  • based on information-centered model
  • Workflow software
  • electronically routes documents from one person
    to another
  • sequences routing in a specific order
  • it is based on a process-centered model

27
End Networks and Telecommunications
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