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SDH Multiplexer is a new generation multi-services transmission and access device based on SDH technologies. It’s function models design adopts G.783 suggestions and provides complete monitor, access, protection, network management and Ethernet access function. It can provide 2 STM-1 uplink interfaces and 63 E1 interfaces, adopts modular structure design for flexible service configurations according to different requirements. It can be used as service access and transmission devices on access layer in the data traffic networks, adopts SNMP network management platform which provides grades powerful management based on Service/Client end mode.