Identification of live cable identification device currently used mainly GPS method and pulse coupling method. GPS law live cable identification device using GPS clock synchronization signal control, the power signal generator output signal phase with GPS second pulse synchronization. Select the target cable method: target cable detected AC signal phase with GPS synchronization, sync non-target optical fiber cable tester Model investigation, using equipment prices charged cable identification device of this test method is extremely expensive, mainly foreign production. Completely replace the previous survey instrument cable cutting, bending, freezing, etc. The best way to troubleshoot fiber optic instrument is a new patented technology does not damage the fiber optic cable troubleshooting instrument manufacturers, its powerful applications, greatly reducing the optical transmission network engineering time and management costs, greatly improve efficiency. Fiber investigation instrument models _ Xin Hao Yuan (certified) _ Fiber investigation instrument provided by the Tianjin Xin Hao Yuan Science and Technology Development Co., Ltd. Tianjin Xin Hao Yuan Science and Technology Development Co., Ltd. (tjaic.gov.cn/shownews.asp?id=5921) is Tianjin, special instrumentation leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness , and satisfy customer needs. Xin Hao Yuan in leadership with the staff warmly welcome all inquiries negotiations to create a better future Xin Hao Yuan.