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Telecommunications, P.II. AIMS 2710 R. Nakatsu. Telecommunications, P. II: An Overview. Network technologies and concepts include: Networking devices Wireless networks Wi-Fi Cellular networks (3G vs. 4G) Last mile broadband Internet/networking protocols Virtual Private Networks (VPNs).

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Telecommunications p ii

Telecommunications, P.II

AIMS 2710

R. Nakatsu


Telecommunications p ii an overview

Telecommunications, P. II: An Overview

Network technologies and concepts include:

  • Networking devices

  • Wireless networks

    • Wi-Fi

    • Cellular networks (3G vs. 4G)

  • Last mile broadband

  • Internet/networking protocols

  • Virtual Private Networks (VPNs)


Network latency

Network Latency

Refers to the amount of time that it takes a packet to get to its destination. It represents the lag, or delay in communications, between your computer and another (target) computer.

  • A ping test can be used to measure latency.

  • Having low latency (i.e. fast response) is especially important where real time, two-way communications are required.


Networking devices

Networking Devices

are the hardware devices that unite the various media and computers and route data and communications throughout a network.

Three Examples:

1. NETWORK SWITCH– A device containing multiple ports that enable you to connect computers, printers, servers and other devices to a network. A switch serves as a controller, enabling networked devices to talk to each other efficiently within a local network.


Network switch central connection point of a network

Network Switch: Central Connection Point of a Network


Networking devices p ii

Networking Devices, P. II

2. ROUTER – A networking device that connects two or more networks: it routes packets of data from one network to another.

  • The router ensures that information doesn't go where it's not needed.

  • The router makes sure that information does make it to the intended destination. Demo

    Question: What is the difference between a router and a switch?

    3. REPEATER – a device that gives your network signals a boost.


Wireless networks wi fi

Wireless Networks: Wi-Fi

How do WiFi hot spots work?

  • Wireless network adapter

  • Access points (e.g., wireless router)

  • A computer’s wireless network adaptor translates data into a radio signal and transmits it.

  • The access point has an antenna that receives the signal and decodes it. It sends the information to the Internet using a cabled connection.

  • As a rule of thumb, the range is about 150 ft (indoors) and 300 ft (outdoors)

    The process also works in reverse (can send radio signals to connected devices).


Wireless networks cellular networks

Wireless Networks: Cellular Networks

  • 3G Cellular Networks offer access speeds usually less than 2 MBPS (download). Two standards: CDMA and GSM.

  • 4G Cellular Networks (e.g., LTE ) offer average speeds from 5 to 12 MBPS (download)

    M-commerce (mobile-commerce)

    • Widespread use of mobile devices (smartphones & tablets) to buy and purchase over the Internet.

      Square Demo


Benefits of wireless networks

Benefits of Wireless Networks

  • They are comparatively cheaper to set up than wired networks.

  • Wired networks may require drilling through walls and running cables through ceilings.

  • A few well-placed wireless access points (or building a mesh network) can reach far more devices than a wired network.

  • Obviously, you have more mobility using a wireless network.

    Question: Are there disadvantages of wireless networks?


Wireless mesh networks

Wireless Mesh Networks

In a wireless mesh network, a network connection can be spread across dozens or even hundreds of wireless mesh nodes that “talk” to one another.

Each node is an access point with a radio transceiver.


Last mile broadband

Last Mile Broadband

When considering overall network speed remember Amdahl’s Law: a system’s speed is determined by its slowest component.

The bottleneck is the so-called last mile, or the connection that customers use to get online.

Three types of last mile broadband:

  • DSL (digital subscriber line) uses the copper wire the phone company has already installed.

  • Cable Broadband uses the cable network.

  • Fiber to the home (FTTH) is the fastest last mile broadband (e.g., Verizon’s FiOS technology).


Internet networking protocols

Internet/Networking Protocols

A protocol is a standard set of rules and procedures for the control of communications in a network.

Open Systems use common standards for hardware, software, applications, and networking.

Proprietary Systems are closed systems that are owned and controlled by a single company.


The great debate of the digital age

The Great Debate of the Digital Age

Open vs. Closed (Proprietary)

Which is the better strategy?


Telecommunications p ii

Some Networking Protocols

Some Examples:

  • Ethernet(LAN protocol): wired connections to a network

  • Transmission Control Protocol / Internet Protocol (TCP/IP): Internet standard

    Wireless Protocols:

  • Bluetooth (low-cost wireless protocol with a range of about 30 feet)

  • Wi-Fi (standard for wireless computer networks—see previous slide for more information)

  • LTE (4G standard with larger range and higher data speeds than 3G)


Public vs private network

Public vs. Private Network

Public Network: a network on which your organization competes for time and use with others.

Private Network: a network that your organization either owns or exclusively leases the right to use the communications media.

What are the benefits of public networks?

What are the benefits of private networks?


Virtual private network vpn

Virtual Private Network(VPN)

A secure network that uses the Internet as its main backbone network, but relies on firewalls and other security features.

Example application: A VPN would enable a company to use the Internet to establish secure intranets between its distant branch offices and manufacturing plants.


A virtual private network

The

Internet

Router

Extranet

Fire wall

Intranet

Server

Fire wall

Router

Intranet

Server

Host System

A Virtual Private Network


Benefits of vpns

Benefits of VPNs

  • Extended connections across multiple geographic locations (larger geographic reach).

  • Improved security for exchanging data.

  • Savings in time and expense for employees if they don’t have to come into the office to work.


Setting up your own vpn

Setting up your own VPN

Popular VPNs include VyprVPN and HotspotVPN

They encrypt all communications you transmit wirelessly and over the Internet.

Some encrypt only web activity while others will also encrypt email exchanges.


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