Communication Systems doc

Communication Systems Lecturer: M.E. P.T.A. Quang Contents  Chapter 1: Introductory Concepts  Chapter 2: QoS  Chapter 3: Transmission and switching  Chapter 4: Digital networks  Chapter 5: Signaling  Chapter 6: PSTN  Chapter 7: VoIP  Chapter 8: Mobile communication  Chapter 9: Satellite communication  Chapter 10: Fiber-optic communication Introductory Topics in Telecommunication  End-users, nodes, and connectivities  Telephone numbering and routing  Tandem switches  Hierarchical structure  Busy hour and grade of services  Simplex, half-duplex, and full duplex  One-way and two-way circuit  Double seizure  Supervision signals  Network topologies  Variations in traffic flow End users, nodes, and connectivities  End-users: inputs to the network / recipients of network outputs  Node: a point or junction in a transmission system where lines and trunks meet. (switching function)  Connectivity: links an end-user to a node, and from there possibly through other nodes to some final end-user destination Telephone numbering and routing:  Every subscriber has an unique number related to physical location. Call 447-8765 Route: look up trunk to 447 Subscriber loop trunk Tandem switches in Local Area Connectivity  Traffic concentrator  reduce the connection  economic expedient Hierarchical structure Busy hour and grade of service  Busy hour: period of maximum usage demand  Grade of service = blocking probability  B=1% : during busy hour, 1 in 100 calls can be expected to meet blockage Simplex, half-duplex, and full duplex  Simplex: one way operation; no reply channel  Half-duplex: two-way service. Only one direction at a time  Full duplex: two-way independent transmission (PSTN) One-way or two-way circuit  Two-way circuit: any trunk can be selected for operation in either direction a) two-way b) One-way c) Hybrid scheme [...]... material) Standardization in telecommunications      ITU (international telecommunication union) ISO (international standardization organization) IEEE (Institute of Electrical Electronic Engineers) ETSI (European Telecommunications Standards Institute) EIA (Electronic Industries Alliance) Telecommunication companies Mobile Telecommunication Co in VN Mobile Telecommunication Co in VN . Chapter 8: Mobile communication  Chapter 9: Satellite communication  Chapter 10: Fiber-optic communication Introductory Topics in Telecommunication . ETSI (European Telecommunications Standards Institute)  EIA (Electronic Industries Alliance) Telecommunication companies Mobile Telecommunication Co.