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.

• MSF (Multiservice Switching Forum)
• MS (Mobile Station)
• MS (Mobile Station)
• MSO (Multiple System Operator)
• MSP (Managed Service Provider)
• MSS (Mobile Satellite System)
• MTBF (Mean Time Between Failures)
• MTS (Message Telecommunications Service)
• MTSO (Mobile Telephone Switching Office or Mobile Traffic Switching Office)
• MTS/WATS Decision (Message Telecommunications Service/ Wide Area Telecommunica-
• MTTR (Mean Time To Repair)
• MTU
• MUA (Mail User Agent)
• mu-law (µ-law)
• multicast
• multicast address
• Multichannel Multipoint Distribution Services (MMDS)
• multi-dwelling unit (MDU)
• multi-level transition (MLT)
• multilink frame relay (MFR)
• Multilink Point-to-Point Protocol (MPPP)
• Multilink PPP (Multilink Point-to-Point Protocol)
• multilocation extension dialing
• multimedia
• multimedia conference