RJ11 Overview The RJ11 interface is similar to the RJ45 interface, but has only 4 pins (8 for the RJ45). In computer systems, RJ11 is mainly used to connect modem modems. The RJ11 usually refers to a 6-position (6-pin) modular jack or plug. This connector has no international standard and is mentioned in the general cabling standard. Moreover, this name is often used for the 4-pin version of the modular connector, causing confusion. RJ Interpretation rj45 Definition In the general cabling standard, there is no separate mention of the ‘RJ11’ statement, all connected devices must be 8 pins. Therefore, the collaborative work and compatibility of RJ11 and RJ45 have not been written. The name RJ stands for Registered Jack and is derived from the USOC (Universal Service Ordering Codes) code from Bell Systems. The USOC is a series of registered jacks and their wiring that was developed by Bell Systems to connect users' devices to the public network. The FCC regulations govern the application of this purpose. The FCC (Federal Communications Commission) issued a document on behalf of the US government that specifies RJ11. RJ11 is the generic name for connectors developed by Western Electric Co. Its shape is defined as a 6-pin connector. Formerly known as WExW, where x means 'active', contact or wire pin. For example, WE6W has all 6 contacts, numbered 1 to 6, and the WE4W interface uses only the 2 outermost two contacts (1 and 6). WE2W uses only the middle two pins. For RJ11, the source of information is contradictory, it can be a 2- or 4-pin 6-pin connector. Even more confusing is that the RJ11 is not only used to represent the 6-pin connector, it is also referred to as the 4-pin version. RJ45 and RJ11 distinguish different standards, different sizes (RJ11 has 6P6C\6P4C\4P4C\4P2C, where C represents the number of gold needles in the crystal head; RJ45 has 8P8C). Due to the different sizes of the two (RJ11 is 4 or 6 stitches, RJ45 For the 8-pin connector, it is obvious that the RJ45 plug cannot be plugged into the RJ11 jack. The reverse is physically feasible (the RJ11 plug is smaller than the RJ45 jack), which makes people mistakenly think that the two should work together. This is actually not the case. It is highly recommended not to use the RJ11 plug for the RJ45 jack. Because RJ11 is not internationally standardized, its size, insertion force, insertion angle, etc. are not uniformly in accordance with international standard connector design requirements, so it cannot ensure interoperability. They even cause damage to both. Since the RJ11 plug is smaller than the RJ45 jack, the plastic part on both sides of the plug will damage the metal pin of the inserted jack.
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RJ11 and RJ45
Source： Time：2018-10-23 14:01:31 views：
RJ11 Overview The RJ11 interface is similar to the RJ45 interface, but has only 4 pins (8 for the RJ45). In computer systems, RJ11 is mainly used to connect modem modems.
