Εφαρμογέςπουχρησιμοποιούντασταδίκτυα data communications Standard εφαρμογέςΥπηρεσίες (Services) Differentiating carriers from other service providers Local access carriers Transport (backbone) carriers Application service providers Service providers Key ingredients of public carriers Υποδομήκαι Know how ΕξπλισμόςπουχρησιμοποιείταιστιςεγκαταστάσειςτουπελάτηκαισχετικέςτεχνολογίεςσυνδεσιμότηταςΔίκτυαφωνήςκαιδεδομένωνΣύνδεσησεπαροχείς carrier/service provider networks Σύγκρισημισθωμένωνγραμμών (leased lines), circuit switching, & packet switching Leased (private) lines Circuit switched Packet switched Data Communications in a Telecom World Protocol defined Network communications Internetwork communications Connection-oriented vs. connectionless services Example of connection-oriented service Example of connectionless service OSI (Open Systems Interconnect) Model Modular design approach Description of OSI layer functions Packaging and transmitting messages TCP/IP protocol suite OSI layer functions compared TCP/IP protocol suite Data link and network layer address functions Network layer Data link layer Comparing routing and switching functions Routing IP packets Frame switching Label switching Technology Fundamentals II Data terminal and communications equipment DTE DCE Interfaces between PCs and modems Dial-up data connections Example of single user Internet access Data transport over analog circuits Analog signals Modulation techniques Modem standards Signal conversions between analog and digital systems Functions of a Codec Converting analog signals to digital signals Interfaces for multi-user access networks Customer equipment interfaces LAN protocols Leased (private) line connections Data transport over digital circuits DCE (Data Communications Equipment) - digital Corporate connections Comparing different multiplexing methods FDM (Frequency Division Multiplexing) TDM (Time Division Multiplexing) STDM (Statistical Time Division Multiplexing) Optical Networking Optical transmission components Light sources Photodetectors Characteristics relating to fiber optic transmission Scattering Absorption Dispersion Types of single mode fiber cables Standard SMF (Single Mode Fiber) characteristics DSF (Dispersion-Shifted Fiber) NZ-DSF (NonZero-Dispersion-Shifted Fiber) Comparison of 1st and 2nd generation optical networks First generation Second generation DWDM (Dense Wave Division Multiplexing) WDM defined DWDM defined ITU-T channel spacing for DWDM Building blocks for optical networks Optical amplifiers OXC (Optical Cross-Connect) OADM (Optical Add/Drop Multiplexer) MEMS (MicroElectroMechanical Systems) Deploying fiber optic cable systems Intercontinental fiber optic cable systems Short-haul undersea cable systems Frame Relay Frame relay defined Packet-switching technology Statistical multiplexing Variable bit-rate traffic Variable-length frames for efficient transport of data Important terms for frame relay service Access methods Virtual circuits DLCI (Data Link Connection Identifier) Traffic management Congestion indicators Frame relay network illustration Comparing the cost of frame relay service to dedicated leased lines Introduction to ATM Evolution of networking Circuit-switched world Packet-switched world Convergence with ATM ATM defined Broadband ISDN Concepts of ATM Transporting different traffic types Transfer mode Packet switching comparison Packet-switching with X.25 Frame switching with Frame Relay Cell switching with ATM Comparing cells, frames, and packets Cells defined Migration from packet switching to frame switching Migration from frame switching to cell switching ATM networks and interfaces Networks Interfaces Virtual connections Identifiers Connections ATM traffic management Quality of service parameters Traffic policing ATM traffic descriptors ATM service categories CBR (Constant Bit Rate) VBR-RT/NRT (Variable Bit Rate Real-Time/Non-Real-Time) ABR (Available Bit Rate) UBR (Unspecified Bit Rate) ATM adaptation layers and attributes AAL-1 AAL-2 AAL-3/4 AAL-5 Broadband Services and Technology Categories of broadband services Residential broadband Commercial broadband Broadband transport networks Broadband access technologies Digital subscriber line service High-speed cable modem service over HFC networks Fixed wireless services The New World of Wireless Cellular concept of frequency reuse Frequency reuse Cellular and PCS (Personal Communications Service)/PCN (Personal Communications Network) frequency spectrum Evolution from 1st to 2nd generation wireless Multiple 2nd generation standards 2.5G wireless communications Enhanced 2nd generation (2.5G) digital cellular and PCS/PCN services Mobile standards supporting high-speed data Third generation(3G) wireless attributes and technologies 3rd generation wireless defined International Mobile Telecommunications-2000 CDMA-based wireless standards 3G global harmonization Harmonizing multiple CDMA and TDMA standards Allowing 2G networks to evolve independently Specifying a network-to-network protocol for intercommunication between family member networks Evolving to a new IMT-2000 network standard.

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