Telecommunications Networks Gerhard Steinke Identify trends in telecommunication

Telecommunications & Networks Gerhard Steinke Identify trends in telecommunication networks. Identify basic components, functions and types of networks. Examine network management issues.

We Live in a Networked World… Telecommunications: The exchange of information over networks Why? • Share data - Between computers: Email, file-sharing, backup • Share peripheral devices – Printers, storage �Local (LAN) �Wide Area Networks (WAN) �Internet Mainframe Laptop Server Communications Services Local Manager WAN Communications Products Work Station Server POS Clients Networked Workgroups BUS 3620 2

Network Components Firewall Router Switch Hub Internet Provider (ISP) Wireless Access Point Hub Switch Clients Repeater Network Interface Card (NIC) BUS 3620 3

Physical Transmission Media Twisted Pair - similar to phone wire Fiber Optics ◦ ◦ glass/plastic fiber using light greater bandwidth lower attenuation - greater repeater spacing BUS 3620 4

Wireless Transmission Media Satellite – microwave signals ◦ HEO - 22, 000 mi. up, LEO - 500 mi. up Cellular – radio signals to cell towers Wireless – IEEE 802. 11 b, a, g, n, … ◦ Speeds to 54 Mbps or more Bluetooth Microwave – line of sight BUS 3620 5

Wireless Technology Advantages Don’t need cabling Good for ◦ mobility ◦ historical buildings ◦ manufacturing environments ◦ real time inventory ◦ hand held devices Disadvantages Lower speeds Higher cost Security? BUS 3620 6

Client/Server Networks • Some computers are servers – usually more powerful, expensive, … Single point of failure – server is down… Need administrator, account management, … Purpose: Email, Database, File, Print, Application, Web servers, … The rest are clients can be smaller and/or slower BUS 3620 7

Network Topology Star - using hubs/switches BUS 3620 8

Network Management Tasks Manage user accounts Manage performance Assigning priorities Detecting and correcting errors Installing cables, wireless access points Traffic, security, capacity planning, … Often responsible for hardware including routers, switches, firewalls…maybe even servers and storage BUS 3620 9

Network Management Model • Security Administration • User/Group Administration • Network Configuration • System Config. • Backup & Restore • Media Control & Storage • Data Management • Data Collection • Remote Store Mgmt. Data Management Administration Integrated Control Planning & Scheduling • Workload Scheduling • Performance Monitoring • Performance Analysis • Capacity Planning Asset Management Problem Management • Software Licensing • Distribution & Control • Employee Profile • Resource Accounting • Charge back Services • Inventory Control • Fault Reporting • Problem Escalation • Resolution Assessment • Help Desk Facilities BUS 3620 10

ISP / Vo. IP ISP - Internet Service Provider A company that provides access to the Internet For a monthly fee you get internet access ISPs are connected to one another http: //www. highspeedinternet. com/wa/seattle? z ip=98119 ◦ Speed http: //speedtest. comcast. net/ ◦ Net neutrality issue… ◦ ◦ Vo. IP - Voice over IP ◦ Using an Internet connection to pass voice data (telephone calls) using the internet ◦ E. g. , Skype, … ◦ http: //www. voip-info. org/ BUS 3620 11

Some Security Concerns networks are easy to tap into - many entry points lots of wires spread throughout wireless all over… organizations sharing the same network, e. g. , airport use of automated passwords to logon to different systems access to a computer access to the network BUS 3620 12

Telecommunication Trends Wireless, mobile Cloud Computing GPS - Location based Io. T – Internet of Things Everything connected? Always connected? Net neutrality … Information overload!? BUS 3620 13

Business Values / Ethical Issues Geographic barriers – non digital part? Time barriers – personal part? Cost barriers – eliminate air travel? Structural barriers – relationships? Public wireless access points BUS 3620 14