9 Sep 2017, 11:33am

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Securitys Optical Networking Systems

For use in complex electrical and climatic conditions at the sites industrial media converters are a series of MC-4TX. Stable operation of these models in adverse conditions provides metal case with a class of dust and moisture protection IP30, wide operating temperature range from -10 to 60 C and resistant to EMI conducted and radiated interference. Each media converter is the series index MTBF 100,000 hours, can operate from power supply 12-48 V DC, protected against reverse polarity and is designed for mounting on DIN-rail. The series includes the MC-4TX 4-port Media Converter MC-4TX1FXMM-2KM, MC-4TX1FXSM-15KM and MC-4TX2FX, differing primarily presence of 1 or 2 port 100 Base-FX, multimode or singlemode SC fiber interface with a maximum range of transmission of 2 km or 15 km, etc. All media converters in this series supports auto-negotiation on RJ-45 ports in full-and half-duplex, switching architecture, Store-and-forward, preventing packet loss with back pressure (for half duplex), implements IEEE 802.3x pause frame flow control (full duplex) and maintain the speed of transmission range from 1 to 1.2 Gb / sec. To supplement the analog video surveillance system IP-devices using coaxial cable already laid Media Converter allows MCE-Coax, which converts the signal to standard 10/100 Base-TX twisted-pair (UTP) to the signal for transmission over coaxial. MCE-Coax ensures highest possible data rate and is effective at sites that require docking analog video to IP-equipped, and where difficult replacement of the existing coaxial cables. New media converters using Ethernet and VDSL2, operating in half duplex or full duplex mode, able to perform bridging and transformation of data transfer over distances up to 1600 m.

Conversion 10/100 Base-TX signal (TP) in 10/100 Base-FX (fiber) with a maximum distance of up to 2 km (multimode fiber) and speeds of up to 100 Mb / s provides 1-port Media Converter MC100FX-TX- PoE. They use technology Buffered Data Store-and-forward in order to prevent packet loss information, are diagnostic features auto-detection of standard cabling MDI / MDI-X, etc. The advantages of models MC100FX-TX-PoE can be include the presence of the adapter PoE IEEE 802.3af, which energizes the media converters and connected to those IP-device (48 VDC) to RJ-45 cable. In this converter provides power to the various network devices at a distance up to 100 meters, whether IP-surveillance cameras, wireless access points or IP-phones with the power consumption to 15.4 Tues In addition, media converters MC100FX-TX-PoE support the LFP (Link Fault Pass Through), which performs automatic notification of the operator occurrence of failures of communication.

4 Jan 2017, 5:05am

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South China University

China pipe production technology attracts worldwide attention. At present, China can supply the domestic and overseas markets a full range of pipeline products, such as lead-in pipes, corrugated pipes, laminated tubes, aluminum / plastic pipe, PEX, pipes for cold / hot water pipes for the supply / discharge of a paid water, electrical cables and wiring, pipes with very high molecular weight, porous pipes, as well as sound-absorbing sewers. Technical innovations in extrusion made in China can be argued that universal extruders and production Chinese production lines were recognized by the international market for their inherent outstanding cost-effectiveness ratio. In recent years, China has launched a complete range of innovative extruded products, which are produced on the basis of advanced extrusion technology. Innovative technology trehshnekovogo compounding Beijing University of Chemical Technology and South China University of Technology have developed innovative trehshnekovye extruders with its own characteristics.

In 2000, Beijing University of Chemical Technology began research and development of fully trehshnekovyh extruders coupled triangular configuration. In August and December 2005 were created industrial prototypes with diameters of 60/20 and 65/24, respectively, which were tested and were put into trial production. In compared with the twin-screw extruders with similar parameters completely screw extruders coupled trehshnekovye triangular configuration provide a greater area of engagement, thus doubling the frequency of shift to melt. For trehshnekovyh extruder characterized by a wide range of distribution of maximum shear rate. As for the distribution shift trehshnekovye extruders have a greater capacity for dispersion and mixing in comparison with the twin-screw extruders.