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RJ45 interface can be used to connect RJ-45 connectors. It is suitable for the network constructed by twisted pair. This port is the most common port, which is generally provided by Ethernet hub. The number of hubs we usually talk about is the number of RJ-45 ports. Keystone Jack,Ethernet Wall Jack,Ethernet Wall Plate,Rj45 Keystone ShenZhen Antenk Electronics Co,Ltd , https://www.antenkelec.com
RJ45 is a type of different connectors (for example: RJ11 is also a type of connector, but it is used on the telephone); there are two different ways to arrange the RJ-45 connector: one is white orange, orange, white green, blue, white blue, green, white brown, brown; the other is white green, green, white orange, blue, white blue, orange, white brown, brown; therefore, there are also wires with RJ45 connector There are two kinds: straight line and interleaved line.
The RJ-45 port of the hub can be directly connected to terminal devices such as computers and network printers, and can also be connected with other hub equipment and routers such as switches and hubs. It should be noted that when connecting to different devices, the jumper method of twisted pair cable used is different.
   described as follows:
1 . Definition of power supply voltage imbalance rate
   The ratio of the maximum difference between the three-phase line voltage and the rated line voltage is called the imbalance ratio of the power supply voltage, that is,
   ε = △ U/UN (1-4)
The unbalance rate (%) of ε - voltage in the formula ;
   △ U- three - phase line voltage maximum difference (V) ;
UN- rated voltage (V) of the inverter .
2 . Allowable range of imbalance rate
   The allowable range for most drives is 3% (8=3%) , and the allowable range for drives is 5% ( ε = 5%) .
3 . Instance
   The three-phase voltages of the power supply are: 385V , 381V and 378V , then
   △ U = 385V -378V = 7V
ε=380/7=0.018 =1.8% <3%
   So, within the allowable range.