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Switching Equipment Overview In the communication system, E1link is the most basic and commonest interface. In practical application, each link has its different bearer services for different levels of importance, so the link should be a higher security level for carrying on the important tasks (such as video conference, broadcast live, banks and exchanges of data, etc.) with higher requirements for the transmission reliability and quality. To ensure no allowable interruption of transmission in various important circuit of reliable communication, it is necessary to increase transmission path, as well as providing back-up circuit and real-time link monitoring, recording circuit operation, and switching based on the failure probability of different transmission path as a judgment standard so as to be an effective means to improve the reliability of the circuit. PSE-60XXAseries of product which is a kind of switching product adopts 1+1 protection type of configuration, with hitless switch and damaged switch for option. Under the hitless working condition, it is applicable to meet the PCM framingE1 circuit recommended by ITU-T G.703 and delay the transmission by signals along the transmission path of the network for time adjustment and completion of switching so that the quality of the automatic protection switching is superior hard-switching (generally known as damaged switching). At work, PSE-60XXA has real-time monitoring the condition ofE1 link so that when the transmission link failure happens or transmission quality falls to threshold value, it will automatically complete hitless switching in a millisecond to ensure smooth flow of high-priority link. PSE-60XXAseries of digital circuit switching protective equipment consists of 2 interfaces, 8 interfaces, and 16 interfaces with its models of PSE-6002A,PSE-6008A and PSE6016A. OnePSE-6002 applies standard 1U chassis, PSE-6008A and PSE6016A use the card-3 U chassis.PSE-6008A has only one switching unit applicable for terminal services.PSE-6008A can be installed with 4 switching units at the same time, while eight switching units for PSE-6016A, which is suitable for the centre, use to facilitate users for configuration under specific circumstances. PSE-60XXAseries of products can centralize and expand towards HUB by RJ45 network port. Switching Protection Equipment Main Functions 1,E1 link of automatic and manual switching functions, with switching conditions including LOS, LOF, AIS alarming and user settings of error threshold 2, Uninterrupted implementation of the on-line error monitoring through the two synchronously working 2M b/s transmission channel to select a better quality transmission channel so as to greatly improve network performance and the transmission quality 3, Switching Time: less than 1 ms 4, Be featured with all functions of interruption BER tests and applicable to have interrupt business BER performance evaluation of E1 circuit 5, Use of large-capacity buffer memory, with hitless switching ensuring the communication quality during switching without data loss 6, Link performance of real-time monitoring (including: M2100 indicators, G.821 indicators, G.826 indicators), the panel and software interface available for indications of a sound real-time status and various warning 7, Choice of Sa-bit or one of free time slots for two-way communication between devices to realize the remote control of terminal switching equipments without any need of additional lines and equipment 8, Can add CRC4 check code to the signals to improve monitoring accuracy Featured with automatic protection features when power failures happen so as to ensure the lines get through 9, The choices of high-precision digital PLL and clock ensure the synchronization of the system and provide the slip frame test 10, The use of large-scale integrated circuit and ultra-large-scale programmable gate array integrated circuits, high-speed network of microcontrollers with features of small size, low power consumption, large capacity, ease of installation 11, Have the function of holding during power-off, still keeping the configuration data and switching records 12, Two-way delay inequality up to 32 ms to guarantee the use of different methods of transmission (such as optical fiber, satellite microwave systems) in a normal use condition as well as implementing test of a transmission delay 13, Application of the design of wide voltage and dual power supplies to different occasions; two-way power supply of AC 220 V or 48 V DC without interruption switch 14, Function of circular test provides an effective means for the diagnosis of line failure 15, Featured with self-surveillance (watchdog) function of the equipment so that it will cause the equipment itself unusual or interference by the external environment (such as fluctuations of supply voltage); the equipment can be reset and restart so as to effectively improve the reliability of equipment 16, Panel setup bypass switch: choose and make direct links to avoid blocking links caused by equipment failures 17, Implement management of multiple devices in the LAN and WAN at the same time through software platform, featured with the flexibility of 10M/100M network interface 18, Network management software can display the various indicators, configuration, graphical circuit topographies of the circuit so that users can very intuitive to see the current operation and history alarming of the circuit 19, Software platform is rich in data presentation: supporting database management with statements, histogram display, print data (including the error, warning, switching records, the indicator results, the minimum time resolution of one second) 20, 1U/3U standard chassis can be used as a desktop as well as an embedded rack