| This text is based on communication network of CHINAUNICOM in Chongqing,go on sufficient analysis to CHINAUNICOM city network performance and business,put forward the concrete networking construction scheme. The full text is divided into 6parts: Introduction, city land network business analysis, network capacity demandanalysis, network current situation analysis, technology choice and planning principles,concrete networking scheme.The existing and main access business type of land net of CHINAUNICOM city isas follows, basic speech business, WLAN business, Internet's business, VPN business,3G business, value-added service, etc... Have pointed out that transmits and alreadybecomes the trend which is built the transmission net in integrated service. One layer ofcapacity needed at present of core of Unicom's network has already exceeded thecapacity of cycle of 10G, need to offer the capacity of 2-3 10G cycles now. Thedevelopment which assembles layer should be developed to the structure of much rings,ensure inserting the access nearby of layer. Traditional GSM is developed slowly atpresent, only needs to do small size construction. C network is the focal point thatCHINAUNICOM develops at present, C network base station present demand is 1-22Ms, consider that develops in the following 2-3 years, the website of the urban area Cnetwork needs 3-4 2Ms, the suburb needs 2-3 2Ms.CHINA Unicom's existing network regards G/C transmission net and China ofNOKIA as the land transmission net of the city as the main fact, but one's own questionthat two kinds of networks both exist. G/C transmission net of NOKIA networkproducts unable to support many business transmit now, not MSTP product, and unableto upgrade. Only assembling on assemble and access layer in network structure, there isno core layer, it is unable to meet demands of network development. Capacity ofnetwork is little , unable to meet business develop requirements for transmissionnetwork, dispatcher's characteristic of point to point in network is bad , unable to meetdispatcher's characteristic. The potential safety hazard exists for the land transmissionnet of the city of Huawei, it do not possess MADM function of two layers , the businessexpands ability badly, can't realize meaning fast that matches of business。City land network build in is it transmit relative persistence of layer and insertunder the guidance of the expansibility thought of transmitting layer to assemble, relymainly on meeting C network goal network business, give consideration to thedevelopment which counts firm, Internet's business。According to the variety of thebusiness at present, and the demand that CDMA carry out the transition to 3G in thefuture. MSTP is regarded as the technological core of network planning in the future. The concrete networking scheme is: Core layer through compare three scheme ofbuilding, intelligence mere network , city land DWDM , 10G SDH (MSTP), proposeadopting 10G SDH (MSTP). Because MSTP can fully meet network's at presentdemands , can have good network expanding types , can smoothly progress to city landDWDM or intelligence optical network in future。Assemble construction each area,adopt 2. 5G MSTP equipment, the key lies in covering; Assemble layer each to belongto and access the core layer, improve the security of the network. Edge access layerwhich adopts MSTP equipment of 155M, 622M rank.
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