– 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. 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. CAUTION: This post illustrates how to wire up a RJ-45 jack for use with a RJ-11 connector.
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