Modems Glossary

 

 

 

 

 

 

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    56k Modem.  56k modem is another term for a V.90 or V.92 modem.

    ADSL Modem (Asymmetric digital subscriber line modem).  An ADSL modem (Asymmetric digital subscriber line modem) is used to provide high data rates over standard telephone twisted pair cables.

    Asymmetric digital subscriber line modem.  See ADSL Modem.

    Asymmetric Modem.  An asymmetric modem provides different data rates on the upstream and downstream links.

    Bell 103 Modem.  Bell 103 is an American standard for PSTN modems with a bit rate of 300 bps.

    Bell 212A Modem.  Bell 212A is an American standard for PSTN modems with a maximum bit rate of 1.2 kbps.

    Cable Modem.  Broadband access via a cable modem is achieved by transmitting data over an existing hybrid fibre/coaxial cable (HFC) network installed for delivering cable television.

    Data Compression in Modems.  Data compression is provided by some modem standards to increase the throughput on the modem link.

    Digital Subscriber Line Modem.  See DSL Modem.

    DSL Modem (Digital Subscriber Line Modem).  A DSL modem supports one or more of the DSL standards.

    Echo Suppression.  Echo suppression is used in telephone networks to reduce the impact of echo and thereby improve voice quality.

    Fax Modem.  A fax modem is used to convert the compressed image representating a page into a form suitable for passing over the telephone network.

    Forward Error Correction.  Forward Error Correction describes the adding of redundancy to a digital transmission to enable transmission errors to be detected and corrected at the receiver.

    Group 3 Fax Modem.  A group 3 fax modem is part of the ITU Group 3 fax standard.

    Microcom Networking Protocols (MNP).  Microcom networking protocols (MNP) are error correction and data compression protocols developed by the modem manufacturer Microcom.

    Microcom Networking Protocols Class 1.  See MNP Class 1.

    Microcom Networking Protocols Class 10.  See MNP Class 10.

    Microcom Networking Protocols Class 2.  See MNP Class 2.

    Microcom Networking Protocols Class 3.  See MNP Class 3.

    Microcom Networking Protocols Class 4.  See MNP Class 4.

    Microcom Networking Protocols Class 5.  See MNP Class 5.

    Microcom Networking Protocols Class 6.  See MNP Class 6.

    Microcom Networking Protocols Class 7.  See MNP Class 7.

    Microcom Networking Protocols Class 8.  See MNP Class 8.

    Microcom Networking Protocols Class 9.  See MNP Class 9.

    MNP.  See Microcom Networking Protocols.

    MNP Class 1 (Microcom Networking Protocols Class 1).  MNP Class 1·is an early error control protocol

    MNP Class 10 (Microcom Networking Protocols Class 10).  MNP Class 10·consists of four protocols known collectively as adverse channel enhancements (ACE) that were designed for inherently unreliable circuits such as cellular transmission.

    MNP Class 2 (Microcom Networking Protocols Class 2).  MNP Class 2 defined a method for asynchronous byte-oriented full-duplex data transmission.

    MNP Class 3 (Microcom Networking Protocols Class 3).  MNP Class 3 defined a method for synchronous bit-oriented communication between modems.

    MNP Class 4 (Microcom Networking Protocols Class 4).  Implementation of MNP Class 4 protocols can increase transmission efficiency by up to 20%.

    MNP Class 5 (Microcom Networking Protocols Class 5).  MNP Class 5 provide a data compression protocol that can increase throughput by up to 200%.

    MNP Class 6 (Microcom Networking Protocols Class 6).  MNP Class 6·is one of the error correction and data compression protocols developed by the modem manufacturer Microcom.

    MNP Class 7 (Microcom Networking Protocols Class 7).  MNP Class 7 provide ·enhanced data compression protocol that can increase throughput by up to 300%.

    MNP Class 8 (Microcom Networking Protocols Class 8).  MNP Class 8·gives an enhancement of MNP Class 6.

    MNP Class 9 (Microcom Networking Protocols Class 9).  MNP Class 9·is one of the error correction and data compression protocols developed by the modem manufacturer Microcom.

    Modem Cable.  A modem cable is used to connect a modem to a computer.

    Modem Drivers.  Modem drivers are software programs that are required for modems that are directly connected to a computer's bus.

    Modems.  Modems are used in almost all long-distance digital communications systems.

    PCI Modem.  A PCI modem is one that plugs into a computer's PCI bus.

    PCMCIA Modem.  A PCMCIA Modem is a modem that is plugged into the PCMCIA port of a computer.

    Radio Frequency Modem.  See RF Modem.

    RF Modem (Radio Frequency Modem).  An RF modem converts a digital signal into a form suitable for carriage over an analogue communications link, and upconverts this signal to higher frequency for transmission.

    Symmetric Modem.  A symmetric modem provides the same data rate on the upstream and downstream links.

    TCM.  See Trellis Coded Modulation.

    Trellis Coded Modulation (TCM).  Using trellis coding, the error rate can be reduced by three orders of magnitude (from 1 in 10 to 1 in 104).

    USB Modem.  A USB modem is a modem that connects to a computer's USB port.

    V.17 Modem.  V.17 is an ITU fax modem standard.

    V.21 Modem.  V.21 is an ITU fax modem standard.

    V.22bis Modem.  V.32 is an ITU standard for PSTN modems with a maximum bit rate of 2.4 kbps.

    V.27ter Modem.  V.27ter is an ITU fax modem standard.

    V.29 Modem.  V.29 is an ITU fax modem standard.

    V.32 Modem.  V.32 is an ITU standard for PSTN modems with a maximum bit rate of 9.6 kbps.

    V.32bis Modem.  V.32bis is an ITU standard for PSTN modems with a maximum bit rate of 14.4 kbps.

    V.32ter Modem.  V.32ter is an ITU standard for PSTN modems with a maximum bit rate of 19.2 kbps.

    V.34 Modem.  V.34 is an ITU standard for PSTN modems with a maximum bit rate of 28.8 kbps.

    V.90 Modem.  V.90 modems were approved in February 1998 to achieve significantly higher data rates (up to 56 Kbps) because upstream data is sent by analogue transmission while downstream data is transmitted in digital format.

    V.92 Modem.  A V.92 modem is very similar to a V.90 modem.

    VF Modem (Voice Frequency Modem).  A VF modem converts a digital signal into an analogue signal whose frequency components lie within the range used by human voice.

    Voice Frequency Modem.  See VF Modem.

     

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