When the GPS is still the only school products Electronics Co., Ltd., Jinan when (website GPS interference school http://www.jnweishang.com products have been tested by the rapid transient high (when GPS school card, Compass time synchronization products, unified timing) frequency interference tests, radiation, electromagnetic interference testing, damping Sasser interference test, impulse voltage test and insulation test standard GB / T15153.1-1998 (Telecontrol equipment and systems - Part 2: Working Conditions 1: Power supply and electromagnetic compatibility ), and reach Ⅲ level and above standard products to the GPS signal / Compass Signal / IRIG-B code / OCXO punctuality unit (optional) for the time base, embedded international popular NTP-SERVER services to NTP / SNTP protocol synchronous network all the computers, controllers and other equipment, network timing. products using precise frequency measurement algorithms and intelligent tame, so time means keep unit output frequency signal and GPS satellite / Beidou satellite / external time reference maintain B code precise synchronization due 1PPS output devices such as a built-time signal is divided by the second signal output oscillator signal synchronized to GPS / Compass signals but not affected by the GPS / Compass second pulse signal transition brought about by the equivalent UTC time benchmark reproduction. adopted the "intelligent learning algorithm" master clock oscillator in taming process can continue to "learn" operating characteristics of the crystal, and store these parameters on-board memory. When the GPS / Compass / external B code abnormal or time reference is unavailable, the device can automatically switch to keep the internal state and the parameter depend on-board memory to compensate for the characteristics of the crystal oscillator, so that the circuit continues to provide punctual output time information with high reliability, while avoiding the deviation due to the impact of the aging of the crystal oscillator on punctuality indicators. device fully modular design, the input, output, power supply, etc. can be flexible configuration, and has a wealth of various types of modules and boards for selection ( special needs can provide customized services), to signal the flexibility to choose the type and quantity can be configured as needed. device has a standard RS232, RS422 / 485, pulse, IRIG-B, DCF77, PTP, NTP / SNTP protocol time output interfaces in the form of school when GPS product features: 1 Compass GPS dual system mutual backup design, high reliability 2 perfect Beidou GPS signal performance monitoring, automatic or manual selection of 3 main satellite signals to provide high-precision network when granted, serial When granted, 1PPS signal, IRIG-B signal 4 supports standard NTP / SNTP Network Time Transport Protocol 5 supports ARP, ICMP, SNMP protocol support for local and remote management 6 7 with LCD and parameter setting functions simultaneously for 8 service hundreds of thousands of clients, servers, workstations during school time. 9 support WINDOWS9X / NT / 2000 / XP / 2003/2008 / vista, LINUX, UNIX, SUN SOLARIS, IBM AIX, HP-UX and other operating systems and Support NTP protocol routers, switches, intelligent controllers and other network equipment. The apparatus uses a fully modular plug and play design, support hot swap boards, flexible configuration, easy maintenance, as well as provide a convenient port on the scene when the network increase the renovation and expansion in the future. When the GPS school certification testing of products: ISO9001: 2008 quality system certification (certificate number: PRC004565), China Electric Power Research Institute inspection certificate (remote [square] terminal seized word 2008 No. 093), China Institute of Metrology certificate (Certificate Number: XDsp2008-0295), East China Electric Power Research Institute Test Report (Report No.: G-34-04). CD is still the company has modern enterprise management mechanisms, focusing on personnel training and new product development, in strict accordance with GB / T19001-2000-ISO9001: 2000 quality certification system for product quality and after-sales service system for management and control. The company is still only at the school as a professional GPS product providers and service providers, will continue to expand the application fields of space and timing products, and actively committed to the grant application and the product of industry specialization and industrialization.