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RJ plugs are divided into two types: unshielded and shielded. The shielded RJ plug is covered with a shielding coating, and its physical appearance is no different from that of an unshielded plug. There is also an industrial shielded RJ plug specially planned for the factory environment, which is allocated and used with the shielding module.

RJ plugs often use a non-slip plug sheath, which is used to maintain the connecting plug, prevent sliding and facilitate plugging. In addition, it has a variety of colors to choose from, which can be provided with the same color as the embedded icon for correct connection.

The information module or the RJ connecting plug and the twisted pair termination have two structures, T568A or T568B, which are the structures supported by the general wiring standards of TIA/EIA-568-A and TIA/EIA-568-B. The RJ crystal header pin sequence number should be investigated as follows: turn the front of the RJ plug (the side with the copper pin) toward you, the end with the copper pin upwards, the end of the connecting cable downwards, and the 8 copper pins from left to right. The needles are numbered in sequence from 1 to 8.