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In the ever before-transforming industry atmosphere, when the communication line telecom operators when there are troubles, operators can not provide the upkeep services furnished only limited to their very own line, this check failed on several instances dealing with hard to discuss the latest Customer circuit surroundings maintenance. Hard circumstances a barrier point positioning An insurance plan organization branches with Hefei, Anhui Telecom gives 8Mbit/sATM and the Shanghai circuit, as lines of communication between headquarters area for improving the security of communications networks, the corporation also makes use of other communication operators provide 6Mbit / sATM circuit, normally with two lines working load balanced manner, shared communications network organization visitors. The moment a route fails, one more line can be fully accountable for all network targeted traffic, thus protecting the user’s day-to-day operations will not take place interruption losses. Soon after opening the communication lines, insurance plan firms, headquartered in Shanghai, beneath the unified arrangements of the two ATM circuits for the Measurement of the particular program for the Shanghai headquarters of the Measurement of place in the United Router Area a server-aspect, Anhui company by means of this two lines to download the server files, therefore the bandwidth check line, quality and stability. In the testing approach, the insurance plan corporation to reflect Hefei Telecom, explained the telecommunications circuit furnished 8Mbit/sATM inadequate bandwidth. Hefei telecommunications engineers to the buyer watch area and found the test terminal by means of 8Mbit / s is shown when the telecommunications line download velocity and 6Mbit / s line to yet another operator shows the same pace, the person hence decide troubles of telecommunication lines . Engineers discovered that the company’s 3 new structures as the internal switch network core units, not equipped with the person within the network, there is no other network interference. Use the ping command to show two lines can get to Shanghai headquarters ATM terminal, and use the trace command also demonstrate that the signal variation is taking the two lines of each port, getting rid of the customer Router Routing settings problem. The router configuration is the national headquarters of the customers of all branches of the unified configuration model of the engineer branch of the check by other provinces, confirmed that there is no problem in this configuration mode. Hefei telecommunications engineer was found by measuring fiber attenuation in the typical assortment, checking bureau side area ATM Switch Setting, also discovered no abnormalities, telecommunication lines can be ruled out, but the phenomenon of customers did not check any better. Hefei telecommunications engineers then identified that when the consumer organization to keep an eye on the use of telecommunications in the ATM line to download a file, Telecom ATM Change Without having a corresponding movement port there, the initial judge customer terminal show the download pace is not offered by the telecommunications line, but can not explain why making use of the ping command with the trace command to show the signal by means of the telecommunication port phenomenon. Hefei Telecom Engineer proposed bypassing the a few-tier customer businesses switch to examination the terminal right linked to the telecommunications router port ATM line, the end result found it difficult to use the ping connectivity Shanghai port engine space. As a result convinced, the customer’s difficulty is that consumers do not configure the router area Shanghai headquarters branch corresponds to the return route of Anhui Province, Hefei, as a result the customer check ATM telecommunication lines, the actual info flow proven in Figure 1. Hefei Figure 1 ATM line telecommunications customer examination info when the actual flow Customer business and the Shanghai headquarters, confirmed the judge, the Shanghai headquarters to change configuration, Hefei client download test showed normal. This scenario, the customer company’s dual-route network formation, network framework, a selected complexity, when utilizing the trace command, considering that the command only displays soon after arrival at the vacation spot deal with by the way, does not display the return path , for engineers to produce obstructions to establish the time of the initial disturbance. The closing rule troubleshooting approach also demonstrates that only the initial kind out the user’s network construction, and then examination the exclusion of other independent networks, can speedily and accurately positioning obstacle position. Line concealed place Tough Circumstance two Hefei telecommunications area for a bank to present SDH network services, consumers set up a room in the SDH products, by way of the unit under the sub-2Mbit / s circuit for the bank customers of World wide web services network. Area right after the growth of bank clients, new router in an additional area, and many others. Network devices , Hefei telecommunications room by way of a financial institution inside the present SDH gear for these new products 2Mbit / s circuit, bank clients area topology shown in Figure two. Figure two, the two outdated and new engine area of the network financial institution Bank data transfer process, the discovery of new router to connect the engine room SDH telecom products 2Mbit / s lines, ports have a more serious packet reduction, and the exact same router to use yet another communications operator PDH system offers 2Mbit / s lines are appropriately employed. Hefei telecommunications engineers 2Mbit / s line ports connected to error Tester Test, the total transmission channel typically, customers of all the previous engine room devices is working correctly, thus excluding Hefei Telecom, the original judge was in the bank’s new router port engine area issues. Nevertheless, the financial institution line port and port to yet another line soon after the swap is still related with the telecommunication line port packet loss takes place, so the router port issue banks have been excluded.network visitors check