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ITGS – Networking and T.
Near and Far:• Local Area Network/LAN/, (hubs, switches) • Metropolitan Area Network/MAN/• Wide Area Network/WAN/ (backbone)
Administrators, Network management system software
Networks
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ITGS – Networking and T.
Global Positioning System/GPS/:• 24 satellites• GPS receiver
Automated Teller Machine /ATM/:• Money
Specialized Networks
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ITGS – Networking and T.
Connection:• direct connection• remote access
Ports:• Parallel v.s serial
Interfaces 1
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ITGS – Networking and T.
Connection:• Network interface card /NIC/• Ethernet & Ethernet port• Dial up• Modem• Facsimile (fax) machine
baud rate = bps bits per second
Interfaces 2
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ITGS – Networking and T.
Broadband Connections:• DSL• Cable modems (cable television networks)• High speed wireless connections (radio waves)• Satellite dishes • Fiber optic cables
Interfaces 3
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ITGS – Networking and T.
Wireless Connections:• Infrared wireless• Bluetooth, A wireless personal area network (WPAN) technology
• Personal Area Network/PAN/, point to point
Wireless
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ITGS – Networking and T.
Bluetooth: • Name: The name Bluetooth comes from King Harald Blatan (Bluetooth) of Denmark, who in the 10th
century, began to Christianize the country. • The first major application of Bluetooth was for wireless headsets to cellphones. Such calls mean using two wireless systems: Bluetooth from ear to cellphone and the carrier's air interface from phone to tower.
Bluetooth 1
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ITGS – Networking and T.
Special Interest Group (www.bluetooth.com) founded in 1998 by Ericsson, IBM, Intel, Nokia and Toshiba. Bluetooth is an open standard for short-range transmission of digital voice and data that supports point-to-point and multipoint applications. Some of the first Bluetooth applications have been for cellphones, providing a wireless connection to a headset and to an automobile's audio system for hands-free operation.
Bluetooth 2
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ITGS – Networking and T.
SpecificationsBluetooth provides up to 720 Kbps data transfer within a range of 10 meters and up to 100 meters with a power boost. Unlike IrDA, which requires that devices be aimed at each other (line of sight), Bluetooth uses omnidirectional radio waves that can transmit through walls and other non-metal barriers. Bluetooth transmits in the unlicensed 2.4GHz band and uses a frequency hopping spread spectrum technique that changes its signal 1600 times per second. If there is interference from other devices, the transmission does not stop, but its speed is downgraded. .
Bluetooth 3
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ITGS – Networking and T.
• Reliability • Integrity,• Security,• Privacy and anonymity,• Authenticity • Intellectual property• Equality of access• Control• Globalization and cultural diversity• Policies and standards• People and machines
Issues
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ITGS – Networking and T.
Web:• How does it work?• Who can read it?• Who can write it?• Who can delete it?• Address• Domain/Domain name system • Moderator and administrator.
Web
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ITGS – Networking and T.
E-mail :• How does it work?• Who can read it?• Who can write it?• Who can delete it?• Address• Moderator and administrator.
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ITGS – Networking and T.
Forum:• How does it work?• Who can read it?• Who can write it?• Who can delete it?• A Newsgroup – A public discussion ona a particular subject• Moderator and administrator.
Forum
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ITGS – Networking and T.
Newsgroup :• How does it work?• Who can read it?• Who can write it?• Who can delete it?• A Newsgroup – A public discussion ona a particular subject• Moderator and administrator.
Newsgroup
