What is RJ11

RJ11 the definition and standards of the relevant provisions.
　　
RJ11 usually refers to the 6-position (6-pin) modular jack or plug. The connectors do not have international standards and are mentioned in the generic cabling standard. Also, this name is often used in the 4-pin version of the modular connector, causing confusion.
　　
In the generic cabling standard, there is no separate mention of ' RJ11 ', all the connecting devices must be 8 stitches. Therefore, RJ11 and RJ45 work together and compatibility has not yet been written.
　　
Origin:
　　
The name RJ, which represents the registered jack (registered Jack), is the USOC (universal service ordering codes, generic services classification code) code from the Bell System. USOC is a series of registered jacks and wiring methods developed by the Bell System to connect users ' devices to the public network. FCC regulations control the application of this purpose. FCC (Federal Communications Commission) issued a document on behalf of the United States Government RJ11.
　　
RJ11 is the common name for connectors developed by Western Electronics Company (Western Electricco). The shape is defined as a 6-pin connection device. Formerly known as WEXW, here the x denotes ' active ', contact or needle-punched. For example, WE6W has all 6 contacts, numbering 1 to 6, and the WE4W interface uses only two contacts (1 and 6) with the outermost 4 stitches, and we2w only uses the middle two stitches. For RJ11, the source of information is contradictory, it can be 2 or 4-core 6-pin connector. More confusing, RJ11 is not only used to represent 6-pin connectors, it also refers to 4-pin versions.
　　
RJ45 and RJ11: different standards, different sizes
　　
Because the size of the two is different (RJ11 is 4 or 6 pins, RJ45 is a 8-pin connecting device), it is obvious that RJ45 plugs cannot be plugged into the RJ11 jack. Conversely, it is physically feasible (RJ11 plugs are smaller than RJ45 jacks), which makes people think they should or can work together. That's not actually the case. It is strongly recommended that you do not use RJ11 plugs for RJ45 jacks. (Computer science)
　　
Because the RJ11 is not international standard, its size, insert strength, insertion angle and so on does not unify according to the International Standard Connector design request, therefore cannot ensure can have the interoperability. They even cause damage to both. Because the RJ11 plug is smaller than the RJ45 jack, the plastic parts on either side of the plug will damage the metal pins of the inserted jack.