Presentation is loading. Please wait.

Presentation is loading. Please wait.

Telemedicine WS 09/10 Computer Networks - 1 Worzyk FH Anhalt computer networks Communication Requirements for a network Topologie of computer networks.

Similar presentations


Presentation on theme: "Telemedicine WS 09/10 Computer Networks - 1 Worzyk FH Anhalt computer networks Communication Requirements for a network Topologie of computer networks."— Presentation transcript:

1 Telemedicine WS 09/10 Computer Networks - 1 Worzyk FH Anhalt computer networks Communication Requirements for a network Topologie of computer networks ISO / OSI reference modell Variety of cables fiber optic cable Twisted Pair coaxial cable WLAN Wi-Fi transmission methods Ethernet Token Ring TCP / IP

2 Telemedicine WS 09/10 Computer Networks - 2 Worzyk FH Anhalt Attributes of Communication Participants –Human to human –Application system to application system –Human to application system Direction –Unidirectional versus bidirectional Dialogue

3 Telemedicine WS 09/10 Computer Networks - 3 Worzyk FH Anhalt Attributes of Communication Distribution –Number of recipient –Contextual recipient Nature –Oral, written, image Standard of communication Distance (size / performance = time) Trigger –Push or pull

4 Telemedicine WS 09/10 Computer Networks - 4 Worzyk FH Anhalt Requirements of a network The speed must saisfy the partners. The management of the components and the end devices as terminals, printers,... must be simple The operating expenses must be economically justifiable.

5 Telemedicine WS 09/10 Computer Networks - 5 Worzyk FH Anhalt Basic elements of a network Computers and nodes which are connected Infrastructure components which connect the computers wiring

6 Telemedicine WS 09/10 Computer Networks - 6 Worzyk FH Anhalt Client / Server Offer resources and services to the public. One server can get orders from several Clients sends orders to a service provider. A Client can address several servers Netz

7 Telemedicine WS 09/10 Computer Networks - 7 Worzyk FH Anhalt Categories of networks

8 Telemedicine WS 09/10 Computer Networks - 8 Worzyk FH Anhalt Categories of networks Private networksPublic networks Dimension Speed Application Technologie Local Area Network LAN Metropolian Area Network MAN Wide Area Network WAN Campus ca. 500 m Mbits/s Data Images Ethernet Token Ring 1 Gbits/s Data MM FDDI DSL Ethernet Region ca100 km Mbits/s Data Speach DSL unlimited bis 64 Kbits/s Data Images analog ISDN bis 2,5 Gbits/s Data, Video Speach DSL

9 Telemedicine WS 09/10 Computer Networks - 9 Worzyk FH Anhalt

10 Telemedicine WS 09/10 Computer Networks - 10 Worzyk FH Anhalt transmission methods Direct connection between Client and Server Store and Forward network Broadcast network

11 Telemedicine WS 09/10 Computer Networks - 11 Worzyk FH Anhalt Telephone: direct connection

12 Telemedicine WS 09/10 Computer Networks - 12 Worzyk FH Anhalt Internet: Store and Forward Local network Local Network Internet Data packet

13 Telemedicine WS 09/10 Computer Networks - 13 Worzyk FH Anhalt Radio: Broadcast

14 Telemedicine WS 09/10 Computer Networks - 14 Worzyk FH Anhalt Topology of the computer connections StarRingBus

15 Telemedicine WS 09/10 Computer Networks - 15 Worzyk FH Anhalt Topologie Star + When a cable breaks, only one component fails - Long cables Ring + shortest cables, best transmission characteristic -When a cable breaks or one component fails, the whole transmission fails Bus + most simple cabling - Problems with simultaneous transmissions

16 Telemedicine WS 09/10 Computer Networks - 16 Worzyk FH Anhalt Verkabelung

17 Telemedicine WS 09/10 Computer Networks - 17 Worzyk FH Anhalt Heinrich - Braun - Krankenhaus Zwickau

18 Telemedicine WS 09/10 Computer Networks - 18 Worzyk FH Anhalt Zentralkrankenhaus central - hospital Klinikum Hannover Oststadt

19 Telemedicine WS 09/10 Computer Networks - 19 Worzyk FH Anhalt Pavillon – Krankenhaus Pavilion - hospital

20 Telemedicine WS 09/10 Computer Networks - 20 Worzyk FH Anhalt Krankenhausverbund network of hospitals

21 Telemedicine WS 09/10 Computer Networks - 21 Worzyk FH Anhalt Campus

22 Telemedicine WS 09/10 Computer Networks - 22 Worzyk FH Anhalt Primärverkabelung primary cables backbone

23 Telemedicine WS 09/10 Computer Networks - 23 Worzyk FH Anhalt ISO / OSI Referenzmodell International Standards Organization Open System Interconnect Reference Model consists of 7 layers, which realise the different tasks of the data communication.

24 Telemedicine WS 09/10 Computer Networks - 24 Worzyk FH Anhalt ISO / OSI layers

25 Telemedicine WS 09/10 Computer Networks - 25 Worzyk FH Anhalt ISO / OSI layers Sicherung - Data Link Physikalisch - Physical Netzwerk - Network Transport - Transport Anwendung - Application Darstellung - Presentation Sitzung - Session

26 Telemedicine WS 09/10 Computer Networks - 26 Worzyk FH Anhalt Cabling Primary cabling: between buildings Fiber optics Coaxial cable Radio relay system Secundary cabling: main cable in building Fiber optics Coaxial cable Tertiary cabling: within a floor (often a star) Fiber optics WLAN (radio network) Coaxial cable

27 Telemedicine WS 09/10 Computer Networks - 27 Worzyk FH Anhalt Fiber optics Sender or Source Analog / Digital Converter Driver unit LEDReceiverPhoto transistor FiberDigital / Analog Converter Driver unit transfer rate: 200 Mbit/s to 1 Gbit/s

28 Telemedicine WS 09/10 Computer Networks - 28 Worzyk FH Anhalt Twisted Pair transfer rate : 1 Mbit/s bis 300 Mbit/s

29 Telemedicine WS 09/10 Computer Networks - 29 Worzyk FH Anhalt Coaxial cable transfer rate : 1 Mbit/s bis 600 Mbit/s

30 Telemedicine WS 09/10 Computer Networks - 30 Worzyk FH Anhalt transmission capacity

31 Telemedicine WS 09/10 Computer Networks - 31 Worzyk FH Anhalt WLAN Wireless local area network Wi-Fi Wi-Fi Alliance WECA (Wireless Ethernet Compatibility Alliance) Accesspoint

32 Telemedicine WS 09/10 Computer Networks - 32 Worzyk FH Anhalt Range of WLAN Up to 100 m outdoor, Limited by Walls Ferroconcrete, Metal Water Humide walls Road-leaved trees Interferences with other equipment

33 Telemedicine WS 09/10 Computer Networks - 33 Worzyk FH Anhalt Security of WLAN Without any precaution everybody in the range of communication can use the network an can put a trace on teh communication. Precaution: –MAC-Address: only dedicated equipment can use the network –WEP Wired Equivalent Privacy: 128 Bit Key, no more safe –WPA2 Wi-Fi Protected Access: 256 Bit Key

34 Telemedicine WS 09/10 Computer Networks - 34 Worzyk FH Anhalt ISO / OSI layers Sicherung - Data Link Physikalisch - Physical Netzwerk - Network Transport - Transport Anwendung - Application Darstellung - Presentation Sitzung - Session

35 Telemedicine WS 09/10 Computer Networks - 35 Worzyk FH Anhalt Ethernet Bus with 10Mbit/s and 100Mbit/s Segments up to 500 m Connection of segments with repeaters –Bridges –Router (Weiterleiter) –Hub (Zentrum, Nabe)

36 Telemedicine WS 09/10 Computer Networks - 36 Worzyk FH Anhalt Ethernet CSMA/CD Carrier Sense Multiple Access with Collision Detect

37 Telemedicine WS 09/10 Computer Networks - 37 Worzyk FH Anhalt Token Ring Before starting to transmit, the sender has to wait for a permission (Token). All devices forward foreign packets. When the data arrive at the receiver it will remove the data and forwards the empty token.

38 Telemedicine WS 09/10 Computer Networks - 38 Worzyk FH Anhalt Token Ring

39 Telemedicine WS 09/10 Computer Networks - 39 Worzyk FH Anhalt Connection elements Repeater A Repeater works at the physical layer. It repeats and apmlifies signals into a second segment.

40 Telemedicine WS 09/10 Computer Networks - 40 Worzyk FH Anhalt Connection elements Hub A hub works at the physical layer. It is the center of a star topology which builds a logical bus.Like a bus, all connected devices get all transmitted information. Hubs can be cascaded.

41 Telemedicine WS 09/10 Computer Networks - 41 Worzyk FH Anhalt Connection elements Bridge A bridge works at the second level, the data link level. A bridge connects two segments. The bridge knows the addresses of both segments and forwards only those messages which are addressed to a device on the other side.

42 Telemedicine WS 09/10 Computer Networks - 42 Worzyk FH Anhalt Connection elements Router A router is a device with connections to at least two networks. It works at the third level, the network layer. A router can connect networks with different technologies.

43 Telemedicine WS 09/10 Computer Networks - 43 Worzyk FH Anhalt ISO / OSI Schichten Sicherung - Data Link Physikalisch - Physical Netzwerk - Network Transport - Transport Anwendung - Application Darstellung - Presentation Sitzung - Session

44 Telemedicine WS 09/10 Computer Networks - 44 Worzyk FH Anhalt TCP/IP Objectivs Independent of the network technologie and the server technologie All-purpose transmission End – to – end connection Standardised protocols

45 Telemedicine WS 09/10 Computer Networks - 45 Worzyk FH Anhalt ISO / OSI layers Sicherung - Data Link Physikalisch - Physical Netzwerk - Network Transport - Transport Anwendung - Application Darstellung - Presentation Sitzung - Session

46 Telemedicine WS 09/10 Computer Networks - 46 Worzyk FH Anhalt TCP/IP IP-Protokoll Selection of the route Converting the global address to a local address Buffer of messages Assemble fragmented messages Avoiding infinite loops

47 Telemedicine WS 09/10 Computer Networks - 47 Worzyk FH Anhalt ISO / OSI Schichten Sicherung - Data Link Physikalisch - Physical Netzwerk - Network Transport - Transport Anwendung - Application Darstellung - Presentation Sitzung - Session

48 Telemedicine WS 09/10 Computer Networks - 48 Worzyk FH Anhalt TCP/IP TCP-Protokoll Main objective: safe transportation of data through the network –full-duplex virtual connection –Transmission as a stream –Sequenznumbers –sliding-Window-function –Controlled connection termination

49 Telemedicine WS 09/10 Computer Networks - 49 Worzyk FH Anhalt ISO / OSI Schichten Sicherung - Data Link Physikalisch - Physical Netzwerk - Network Transport - Transport Anwendung - Application Darstellung - Presentation Sitzung - Session

50 Telemedicine WS 09/10 Computer Networks - 50 Worzyk FH Anhalt Anwendungen HTTP : transmission of HTML FTP : Filetransfer electronical mail telnet : Terminalemulation NFS : Networkdata

51 Telemedicine WS 09/10 Computer Networks - 51 Worzyk FH Anhalt Formats for data exchange XML EDIFACT HL 7 (Helth Level 7) ADT (Abrechnungsdatentypen) BDT (Behandlungsdatentypen)


Download ppt "Telemedicine WS 09/10 Computer Networks - 1 Worzyk FH Anhalt computer networks Communication Requirements for a network Topologie of computer networks."

Similar presentations


Ads by Google