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power-off straight box product description: the power-off straight-through box is mainly used for fast switching of the line, and the connection line can be switched according to the power-on and power-off, through the power-off straight-through box series connection device, and when the device is abnormal, it is quickly switched to another standby line, so as to achieve a quick reply line. the purpose of the connection. appearance the front of the power cut-through box consists of rj48 (ie, the crystal head active line sequence is 1245) and the bnc-q9 female head.
each rj48 mouth communicates with a pair of bnc-q9 female heads on the left and right sides of the rj48 port, and the corresponding relationship between the rj48 mouthline sequence and the bnc_q9 pins is shown in table 1. table 1: power failure through box front power off the back of the box when the power-off straight-through box works in the power-off mode, the two adjacent rj48 ports communicate with each other, and the interworking relationship is shown in table 2. table 2: when the power-off straight-through box works in the power-on mode, each rj48 port on the front of the power-off direct box corresponds to the rj45 port on the back of the straight box, and the circuits are connected. the corresponding relationship is shown in table 3. (the ctrl/net port on the back of the power cut-through box does not work in the straight-through connection). table 3: explanation: in the power-off mode, e1_1_a and e1_1_b are loops in the power-off pass-through mode. the circuit is directly connected. similarly, e1_2_a and e1_2_b are loops, and the circuit is directly connected.
the power-off straight-through box is connected to the back of the power-off straight box in the energized mode e1_1_a, and is connected to the corresponding line sequence e1_1 of the corresponding port of the power-off direct box; the line corresponding to the port of the power-off straight box is connected to the back of the power-off straight box of e1_1_b. sequence e1_1 connectivity.
similarly e1_2 |