Exploration and Thinking on the construction of communication network laboratory With the development of information communication technology and business volume increased, the social demand for communication professionals continue to increase, from the employment situation in recent years, enterprises need is not only a better theoretical foundation, but also has strong practical ability, and understand the comprehensive talents communication industry technology. Therefore, colleges and universities must constantly improve communication laboratory construction, the improvement of experimental model, in order to meet the market demand for talents. Our proposed the construction of integrated communication network experimental platform is planned for 2009, and won the central local governments to build professional lab project.The necessity of 1 laboratory construction and the status quo of comprehensive experimental platformSince 2000, has built a computer technology, electronic technology, communication principle, high frequency electronic, EDA and other basic laboratory and detection and control laboratory. 2004 communications professional began to recruit students, in order to meet the teaching requirements, to build the communication laboratory. Because at that time the school funds, set up the construction of professional communication laboratory is divided into two step plan on the existing basis: the first step, construction to meet the basic laboratory teaching requirements, mainly to complete fiber, program control, communication network, mobile communication and other professional courses experiment. The composition of the laboratory construction projects in various experimental box and equipment related to the basic 1, 1 boxes, its features are: the technology is mature, less investment, convenient maintenance. The second step, the construction of integrated communication network laboratory. The first step of construction project was completed in 2006.Since 2006, communication laboratory to play its due role in the experimental teaching work. But these devices are independent, did not form a network, the system is not strong, the experimental contents are the demonstration, validation. With the rapid development of communication technology, this kind of laboratory conditions limitation, no systematic communication of the whole network, students lack the concept system of professional courses are taught, unable to meet the further study and the market for communication technology talent demand. So the construction of experimental platform for communication network is very necessary.Construction idea and target of 2 integrated communication network experimental platformWith the development of communication industry, telecom industry is towards mobile, broadband direction of continuous integration. Therefore, the basic idea of integrated communication network experiment platform construction is a comprehensive modern communication network to build a set of transmission, switching, broadband access and wired, wireless communication as a whole, is a similar to the real network telecommunication system. The system can realize the simulation of network operation, network connection, and be able to complete the training and research of each equipment platform. Through this experimental system, let the students from software to hardware experience a full range of modern communication in real environment, an intuitive understanding and the understanding to the profession, improve the professional quality, exercise ability, training students to meet the social needs comprehensive type, application type communication technology talent.The construction scheme of 3 integrated communication network experimental platform and contentThe construction scheme is to advanced technology, and reasonable in economy, through repeated demonstration, and puts forward the existing funding conditions, integrated communication platform is suitable for the development of modern communication technology. The platform consists of SDH transmission network, PSTN, mobile wireless access network, EPON optical access network, network planning, network quality system.3.1 network topology structure of network topology is shown in figure 1.Fig. 1 integrated communication network experimental platform topology The 3.2 optical transmission systemOptical transmission system is the core of the network communication, the communication among the modules. The system adopts SDH technology, forming a ring network consists of 3 sets of STM-1 equipment. SDH technology is the mainstream technology of communication network, it provides the communication service quality, efficient, reliable with its outstanding advantages for the network, can meet the transmission requirement of multi service broadband data and video images, self-healing function. For communication engineering specialty students master transmission technology, is very important.Transmission system using Optix155/622HMetro1000 equipment Huawei company, main functions and configuration is as follows:(1) system with high order cross capacity is 136 × 136VC4, the low order cross capacity of 1638 × 1638VC12.(2) transmission system with single configuration of STM-1 optical interface 2, 21 E1 interface, FE interface for the number 4, support online light rate of 155M to 2.5G upgrade.(3) having multi service processing capabilities, provide multiple E1, T1, E3 and T3 business and all kinds of audio interface, data interface function.(4) the MSTP third generation technology, support Ethernet signal gathering, the two layer switching and VLAN.(5) transmission system equipment management software, to provide complete network element management function at the same time, provides the network management function, end to end management to support the traditional business.(6) the entire transmission network protection mechanism, cross, clock, power supply adopts 1+1 protection measures, have the function of automatic diagnosis and fault alarm analysis of strong, improve the security and reliability of the network system.3.3 program-controlled exchange systemSPC switching system using Huawei company C&C08 program-controlled switching equipment, through the transmission network and other equipment to build a complete simulation of the actual application, with inter office switching, remote access function complete exchange network. Main configuration:(1) the exchange capacity of 16K × 16K system, analog telephone user 96, digital relay 120DT (expandable to 50000 line and 10000 line simulated user digital relay).(2) provide Chinese signal No. 1, No. 7 signaling, meet inter office communication requirements; to provide voice services and other integrated access services, configuration of various interface.(3) provides device level network management software, can be set up, configure the hardware device, for observation, tracking etc..3.4 TD-SCDMA wireless networks of mobile communication systemTD-SCDMA technology is one of the most widely used new technology, greatly improve the speed of data transmission, the realization of the mobile broadband, can handle images, music, video and other forms of media, provide Webpage browsing, telephone conference, e-commerce and other information services.Unit is composed of a TD-SCDMA wireless base station controller system (RNC), wireless baseband processing and RF unit (Node B) and wireless network operation and maintenance center (OMC-R) and other major equipment and related system software.TD-SCDMA wireless side of the base station controller unit (RNC) using Huawei company new generation base station controller type DRNC820 equipment, the equipment of high integration, high capacity, good reliability, can meet the development of future high-speed packet service, greatly enhance the TD-SCDMA system wide bandwidth and capacity. The system uses MAIO (Multiple Access To I n One) technology, ATM, TDM and IP exchange system, which supports the 2G transmission resources is forward compatible, the evolution to the IP also support. The machine adopts modular design, support for single frame to solve the upgrade program and smooth; dual plane GE Star exchange network, can provide the exchange capacity of the largest 120Gbps; rich interface, can provide a variety of network modeTD-SCDMA wireless side of baseband processing and RF unit adopts the design of multi form of unified module industry leading technology, has the advantagesof small volume, large capacity, low power consumption, flexible installation, TD-SCDMA baseband processing capacity can support up to 36 load fan.Operation and maintenance system is mainly to complete the software management, fault management, performance management, test management, transport management and other functions.3.5 EPON optical access systemEPON optical access system using Huawei type MA5680T equipment, has many features characteristic of rich, can provide a large capacity, high rate, access to voice, data and video services high bandwidth. The equipment for GPON/EPON integration equipment, to meet with the3.4 TD-SCDMA wireless networks of mobile communication systemTD-SCDMA technology is one of the most widely used new technology, greatly improve the speed of data transmission, the realization of the mobile broadband, can handle images, music, video and other forms of media, provide Webpage browsing, telephone conference, e-commerce and other information services.Unit is composed of a TD-SCDMA wireless base station controller system (RNC), wireless baseband processing and RF unit (Node B) and wireless network operation and maintenance center (OMC-R) and other major equipment and related system software.TD-SCDMA wireless side of the base station controller unit (RNC) using Huawei company new generation base station controller type DRNC820 equipment, the equipment of high integration, high capacity, good reliability, can meet the development of future high-speed packet service, greatly enhance the TD-SCDMA system wide bandwidth and capacity. The system uses MAIO (Multiple Access To I n One) technology, ATM, TDM and IP exchange system, which supports the 2G transmission resources is forward compatible, the evolution to the IP also support. The machine adopts modular design, support for single frame to solve the upgrade program and smooth; dual plane GE Star exchange network, can provide the exchange capacity of the largest 120Gbps; rich interface, can provide a variety of network modeTD-SCDMA wireless side of baseband processing and RF unit adopts the design of multi form of unified module industry leading technology, has the advantages of small volume, large capacity, low power consumption, flexible installation, TD-SCDMA baseband processing capacity can support up to 36 load fan.Operation and maintenance system is mainly to complete the software management, fault management, performance management, test management, transport management and other functions.3.5 EPON optical access systemEPON optical access system using Huawei type MA5680T equipment, has many features characteristic of rich, can provide a large capacity, high rate, access to voice, data and video services high bandwidth. The equipment for GPON/EPON integration equipment, to meet user needs to meet the system expansion and upgrade; ability to back exchange capacity for 275Gbps, business exchangecapacity of bidirectional 68G; single frame can support the ONU/ONT number is 7168; the 3 layer support, support RIPV1/V2 and OSPF routing protocol; meet a variety of application of FTTx, IP, meet the base station transmission line interconnecting, wholesale business network demand.3.6 network optimization systemWireless network test system the test software Dingli company, with GSM/GPRS/TD-SCDMA/HSDPA network test functional. Can provide a variety of test methods.3.7 special E-Bridge test softwareBecause of the experimental platform using hardware equipment for commercial equipment, so to consider the whole network system suitable for students to experiment, in general, the actual number of commercial equipment management terminal only one, such as a class of 40 students, need to be divided into 40 groups, is clearly not realistic. Special E-Bridge test software party R & D, solves many operational problems, meet the needs of each system can be 40 students in the experimental operation, the commercial equipment into experimental equipment for teaching in Colleges and universities.The special E-Bridge software process control experiment with experiment, experiment teaching flexibility in the distribution of test items and test time, test time can be adjusted for each student, the software can satisfy the requirements of many times experiments.Comprehensive experiment platform system consists of configuration more equipment, software, also consider the establishment of the communication power supply equipment, optical fiber distribution frame, digital distribution frame, audio distribution frame and other equipment.4 experimental project contentThe whole experimental system via the communication network management software, the experiment can be carried out operation meet 40 student terminal, the main experimental project can be carried out as follows:(1) the SDH optical transmission system experiment 1: allocation of transmission equipment: through the transmission network management software to operate the equipment loading and maintenance; the hardware configuration, data distribution function module resources; the network experiment: SDH chain type network, ring network configuration; Experiment 3 channel protection: the transmission interface, logic system standard setting, protection, realization of path protection and multiplex section protection mechanism of the experiment; the network operation experiment; the overhead analysis experiment: the transmission multiplexing and demultiplexing byte analysis experiment.(2) SPC switching systems: switch hardware configuration experiment: through the switch network management software to operate the equipment loading and maintenance; distribution of each function module of resources; the user experiment: configuration, analysis of user and the number of users; the new business setting and registration; the telephone call processing experiment:To observe the call processing, signal process; the interoffice signaling system experiments include: debugging NO1 and NO7 relay, bureau to set, monitor, routing, signaling process and outgoing call process; the charging system experiment; the global comprehensive business experiments.(3) RNC system experiment: the experiment data configuration: configuration of RNC equipment, network structure, database; the link, channel configuration information; the cell parameter configuration, optimization, parameters testing; the structure of RNA network experiment; the mobile phone registration, call, handoff process analysis experiment.(4) the network optimization, road test content: mobile phone terminal test: including call, data service, mobile phone mandatory testing; analysis of the indoor floor, building, testing, data analysis of cell coverage; test; ③neighbor optimization test, 2G/3G system between neighbor optimization analysis; the network optimization of comprehensive test etc..(5) other operation experiment: cable laying, optical fiber, cable terminal box connection test.5 integrated communication network experimental platform characteristics(1) 3.6 network gauge network systemDing company is used in the wireless network testing system of testing software, has perfect GSM/GPRS/td-scdma/HSDPA network testing capabilities. Can provide a variety of testing methods.3.7 special e - bridge, the experimental softwareSince the hardware equipment of the experimental platform is chosen as the commercial equipment, so how to consider the entire network system is suitable for students to experiment, generally speaking, the actual number of commercial equipment management terminal is only one, so that for a class of 40 students, need 40 groups, clearly not reality. - the company research and development of special e - bridge experiment software, solve the problem of the operation of many, meet every operating system platform can 40 students experiment, put into commercial equipment suitable for the teaching of experimental equipment.Special e - bridge experiment software for process control function, the experiment teachers flexible distribution experiment project and experiment time, experiment of the students in each group can be adjusted time, the software can also meet the requirements of many computer experiment many times.Comprehensive experiment platform of system in addition to the above configuration equipment, software, also consider set up communication power supply equipment, optical fiber distribution frame, digital distribution frame, with audio distribution frame, and other equipment.4 experimental content of the projectThrough the communication network management software, the whole experiment system can meet the terminal 40 student experiment operation, experiment items can carry out the main content is as follows:(1) the SDH optical transmission system: (1) transmission equipmentconfiguration experiment: through the transmission network management software loading operation and maintenance of equipment; Hardware configuration data, and resource allocation module, etc.; (2) network experiment: type chain of SDH network, ring network can be networking configuration; (3) channel protection experiment: by means of transmission light set mouth, logic system, protection system, implement channel protection and reuse period of protection mechanism of the experiment; (4) network management operation experiment; (5) cost analysis experiment: 6 multiplexing transmission solution reuse bytes analysis experiment and so on.(2) the program-controlled exchange system: (1) switch hardware configuration experiment: by switches, network management software loading operation and maintenance of equipment; Distribution of each functional module resources; (2) the user experiment: user configuration, analysis and number; The bureau registered user setting and new business, etc. (3) phone call processing experiment: to observe the call processing, signal process; (4) bureau between trunking signaling system experiment: including the NO1 and NO7 relay commissioning, bureau to set up, routing, observation of plan hair signaling process and out call process; 5. The billing system experiment; 6. Experiment of global integrated business, etc.(3) the RNC system experiments: (1) data configuration experiments: the RNC equipment state configuration, network structure, background database; (2) link, the channel information configuration; (3) cell parameter configuration, optimization, the parameters of the test; (4) RNA experiment network structure;(5) registered mobile phone, call, such as switching process analysis experiment.(4) net, road test experiment content: (1) mobile phone terminal test: including compulsory test call, data services, mobile phones etc; (2) indoor test, data analysis, building, floor; Area coverage testing analysis; (3) adjacent regions optimization test, 2 g / 3 g systems between adjacent area optimization analysis; (4) network optimum comprehensive test experiment, etc.(5) other operating experiment: wire cloth, optical fiber and cable terminal box in the experiment.Five characteristic of integrated communication network experiment platform(1) the new technology, the function is strong, wide applicable. The simulation experiment platform of modern communication network system, integrating transmission, exchange, mobile communication, communication engineering course experiment, can be integrated training content such as graduation design, professional practice.(2) content, strong systemic. Basic to verify previous experiment content is given priority to, integrated communication network experiment platform is built, provides rich, broad experiment content, can carry out a large number of comprehensive type, design and research experiments, provides the wholeentire network experimental environment for the teachers and students.(3) the system configuration, good operability. The whole platform hardware equipment technology advanced, comprehensive software management function, can provide students with a good experiment operating conditions.The construction of the integrated communication network experiment platform, from the program to determine equipment type selection, system configuration, train of thought clear, accurate positioning and well developed关于通信网络实验室建设的探索与思考周海燕李天松符杰林黄建华【摘要】：针对通信和电子信息专业特点提出了现代通信网络实验室基本功能和要求,利用现有网络设备和先进网络技术,设计开发各层次相关实验教学内容,利用实验具有的先进性、设计性、系统性和综合性等特点,来提高学生多种理论知识点的综合应用水平和实践创新能力,从而提高专业实验教学水平和仪器设备使用率。
