MMR (Modified Modified Read)

A compression algorithm used in Group III and Group IV facsim-

ile machines operating at 14.4 kbps or better and specified in ITU-T Recommendation T.6, MMR uses a two-dimensional compression technique that permits the transmitting modem to view and consider multiple lines of data during the encoding process. At 28.8 kbps, Group III machines can transmit a page in approximately four (4) seconds using a V.34 modem employing Quadrature Amplitude Modulation (QAM). At 33.6 kbps, Group III machines can transmit a page in about three (3) seconds using a V.34bis (aka V.34+) modem employing Trellis Coding Modulation (TCM). See also compression, encode, facsimile, Group III, Group IV, ITU-T, modem, QAM, T.6, TCM, V.34, and V.34bis.

• Appendix A: Standards Organizations
• application
• Application Layer
• application processor (AP)
• application program interface (API)
• application programming interface (API)
• Applications
• application service provider (ASP)
• application software
• application-specific integrated circuit (ASIC)
• appointment call
• APS (Automatic Protection Switching)
• aramid (aromatic polyamide)
• Archie
• architecture
• archiving
• ARCNET (Attached Resource Computer NETwork)
• area code
• area code
• area code
• ARIN (American Registry for Internet Numbers)
• arithmetic coding
• arithmetic logic unit (ALU)
• armored cable
• .arpa (address routing and parameter area)