RJ (Registered Jack)

Referring to a series of jacks, described in the U.S. Code of Federal Regulations,

Title 47, part 68, providing a standardized physical and electrical interface to the public switched telephone network (PSTN). See also jack, Part 68, and PSTN.

• refraction
• refractive index
• refresh rate
• regenerative repeater
• Regional Bell Operating Company (RBOC)
• Regional Internet Registry (RIR)
• register
• registered jack (RJ)
• registered port
• Registration/Admission/Status (RAS)
• registration authority (RA)
• regular pulse excitation linear predictive coding (RPELPC)
• regulation
• remote access server (RAS)
• Remote Authentication Dial-In User Service (RADIUS)
• reorder tone
• repeat dial
• repeater
• Request for Comment (RFC)
• request to send (RTS)
• Resilient Packet Ring (RPR)
• resistance (R)
• resistor
• resolution
• resource management cell (RM-Cell)