It’s that simple… you can either punch in standard 4-conductor telephone cable into the jack or you can use Cat5e and then when you connect it to your phone junction box you can connect the colors from the cat5 to the colors I have listed above. – Orange/White on the RJ-45 jack is equal to Yellow – Orange on the RJ-45 jack is equal to Black – Blue/White on the RJ-45 is equal to Red – Blue on the RJ-45 jack is equal to Green If you have a telephone system, like a Panasonic KSU, you need both pairs since it uses the others to send status information like CO, Time, Date, Caller ID, and the likes using the phone systems proprietary protocol. The Black and Yellow are tip and ring for line two of service. Green and Red wires on standard bell systems are tip and ring for line one of service. Since a RJ-45 connector won’t fit into a RJ-11 jack, you won’t ever have this risk.
The plug is inserted into its counterpart, the jack, which is commonly affixed to a wall or baseboard. Please be advised, that it is wise to use voice grade RJ-11 jacks instead of RJ-45 jacks for voice or telephone systems because you run the risk of someone plugging a computer into the phone jack, which might fry or ruin the network card in the computer if the telephone rings or is plugged into a phone system. A telephone jack and a telephone plug are electrical connectors for connecting a telephone set or other telecommunications apparatus to the telephone wiring inside a building, establishing a connection to a telephone network. CAUTION: This post illustrates how to wire up a RJ-45 jack for use with a RJ-11 connector.
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