ABB PFEA112-20 3BSE030369R0020

Description

ABB PFEA112-20 3BSE030369R0020

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Taking PFEA112-20 3BSE030369R00201 central station and 2 substations as an example in the figure, the main station equipment of the central station is interconnected with the substation terminal equipment through the E1 circuit of the SDH network. Assuming that each substation needs to access 4 channels of low-speed data, occupying 1-4 time slots of their respective E1 circuits. The 2 E1 signals are transmitted to the central station through the SDH network. In order to merge the 1-4 time slots already used in the 2 E1 signals into one E1 circuit, the central station needs to be equipped with a time slot scheduling device (DDN device). The E1 circuit, which has been merged through time slots, is directly connected from the communication room to the new serial port server in the automation room. Upward direction:

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