RJ11連接器與電話接口詳細介紹
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因為這種線序中第3、4對雙絞線中的兩線相距較遠，會引起較大的串擾，不適合Ethernet這種高頻信號的傳輸。
還有一種RJ48連接器，也是8P8C，可用于連接4對T1數據鏈路，每對線可傳輸時分復用的23個話路。
其他不太常用的RJ系列連接器還有：
RJ2MB: 50-pin miniature ribbon connector
RJ12C/RJ12W: 6P6C, for one telephone line ahead of the key system
RJ13C/RJ13W: 6P4C, for one telephone line behind the key system
RJ15C: 3-pin weatherproof, for one telephone line
RJ18C/RJ18W : 6P6C, for one telephone line with make-busy arrangement
RJ21X: 50-pin miniature ribbon connector, for up to 25 lines
RJ26X: 50-pin miniature ribbon connector, for multiple data lines RJ27X: 50-pin miniature ribbon connector, for multiple data lines
RJ31X: 8P8C (usually only 4C are used), single line with alarm - center pins #4 #5 connect to phone line; outside pins #1 #8 connect to another phone jack allowing the alarm dialer or medical alert system to dial the monitoring company when triggered.
RJ38X: 8P8C, similar to RJ31 but a connection between pin #2 #7 indicates that a plug is inserted.
RJ41S: 8P8C keyed, for one data line, universal
RJ45S: 8P2C + keyed, for one data line with programming resistor
RJ49C: 8P8C, for ISDN BRI via NT1
RJ50: 10P10C, same size as RJ45 but with ten contacts Business phone
RJ71C: 12 line series connection using 50 pin connector
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