Ahmad Mujahed Nayef Programming LAB' Department of Computer Engineering Faculty of Electrical

1
Ahmad Mujahed NayefProgramming LAB.Department
of Computer Engineering Faculty of Electrical
Electronic Engineering University of Aleppo,
AleppoSyria

• Networks WorkshopVolume 3

2
Wireless LAN

• Wireless LANs use high frequency radio signals,
  infrared light beams, or lasers to communicate
• For longer distance, wireless communications can
  also take place through cellular telephone
  technology, microwave transmission, or by
  satellite.

3
Wireless LANs

• Transmission Techniques
• Infrared
• Laser
• Narrow-band radio
• Spread-spectrum radio

4
Extended LANs

• Multipoint Wireless Connectivity
• A wireless bridge is used as an easy way to
  connect building.
• Range can be up to 3 miles.
• Eliminates the expense of leased lines.
• Long Range Wireless Bridge
• Uses spread-spectrum technology.
• Can reach up to 25 miles.

5
Infrared

• Types of Infrared
• Line of sight.
• Scatter
• Transmissions bounce off walls and ceilings.
• Effective area limited to 100 feet.
• Reflective.
• Broadband
• Capable of high quality multimedia

6
Laser

• Similar to infrared
• Requires line of sight transmission

7
Narrow-band Radio

• Does not require line of sight.
• Broadcast range is 5000 square feet.
• Signal is high, so it cannot go through steel or
  load bearing walls.

8
Spread-spectrumRadio

• Broadcasts signals over a range of frequencies.
• Frequencies are divided into hops, and spread
  spectrum adapters tune into specific hops for a
  predetermined length of time.

9
802.11

• 802.11 refers to a family of specifications
  developed by the IEEE for wireless LAN
  technology. 802.11 specifies an over-the-air
  interface between a wireless client and a base
  station or between two wireless clients. The IEEE
  accepted the specification in 1997.

10
Networking Hardware
11
Networking Hardware

• Servers.
• Workstations.
• Switches, Hubs.
• Bridges.
• Routers.
• Network Interface Cards (NIC).

12
Networking Hardware

• Switches, Hubs

13
Networking Hardware

• Routers - translates information from one network
  to another

14
Networking Hardware

• Network Interface Cards (NIC)

15
Network Adapter Card Compatibility

• The card must fit the data bus architecture
• ISA (Industry Standard Architecture)
• EISA (Extended ISA)
• Micro Channel
• PCI (peripheral component interconnect)
• The card must fit the media which will attach to
  it
• Thinnet requires BNC connections
• Thicknet requires a 15-pin AUI connections
• UTP requires an RJ-45 connections

16
Network Adapter Card Compatibility

• If wireless need to verify that the 802.11
  standards match between the NIC and the
  router/switch

17
WAN Technologies

• Analog
• Dial-up Lines
• Dedicated Lines
• Digital
• DSL
• T1
• T3
• ISDN

• Packet Switching
• X.25
• Frame Relay
• ATM
• Fiber Optics
• FDDI

18
Broadband Technologies

• ISDN
• DSL
• Cable
• Satellite

19
T1

• Provides point-to-point communications using two
  line pairs for send and receive.
• Rate is 1.5444 Mbps.
• Most costly of all WAN links
• Users can subscribe to fractional T1 lines in 64
  Kbps increments.
• Uses multiplexing or mixing to send several
  signal from different sources through one line.

20
T3

• Provides voice and data-grade service from 6 Mbps
  to 45 Mbps.
• T3 and FT-3 are designed for transporting large
  amounts of data at high speed.
• Can be used to replace several T1 lines

21
ISDN

• Integrated Services Digital Network.
• Accommodates voice, data, and imaging.
• Basic Rate ISDN has three data channels, 2 at 64
  Kbps (B channels) and 1 at 16 Kbps (D channel).
• Computer can use both B channels for a combined
  128 Kbps data stream.
• This is a dial-up service.

22
DSL

• digital subscriber line. Public network
  technology that delivers high bandwidth over
  conventional copper wiring at limited distances.
  There are four types of DSL ADSL, HDSL, SDSL,
  and VDSL. All are provisioned via modem pairs,
  with one modem located at a central office and
  the other at the customer site.

23
????? ????????

• ?????? 14 ????? ???????? 1425?????? 31 ????? 2004