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MFC/R2 – Summary

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  • #69793 Reply
    Wallis Dudhnath

    Summary of MFC/R2.

    MFC – Multi Frequency Compelled. This is a mechanism whereby audio tones are sent down telecommunication circuits in
    order to convey signalling information.

    R2 – R2 simply refers to Region 2 and R1 is Region 1. Nowadays, protocols have evolved and
    been renamed, so the term “R2” is most-commonly used as a nickname for the protocol properly known as
    MFC/R2. The term “R1” is not commonly heard at all anymore, certainly not when describing protocols.

    MFC/R2 stands for MultiFrequency Compelled/Region 2. Commonly called R2, this protocol is over 60 years old, and used to be a very common signalling mechanism throughout most of the international public telephone

    #69794 Reply
    MFC / R2

    Previous update was done to support this community to understand MFC / R2 signalling. I have seen several threads regarding Line and Register based sinalling systems based on R1 / R2, DC10, AC9, etc..

    For background with these analog signalling feel free to raise your questions.

    Since CCITT No 7 (Red, Blue and White books) the Network signalling is now advanced to cater for PAN Network services as opposed to the traditional POT Services.

    #69795 Reply
    Wallis Dudhnath

    DC signalling has its origins way back in telephony. Battery signalling was extensively employed in early manual systems as a method of interconnecting
    switchboards. For CPE to access Switching resources DC Line Signalling was a main staple. Now we have MF4. The last “mile” of the local loop is the last part of a Digital Network that is analogue. End to end ISDN was an earlier attempt to have a full Digital Network.

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Reply To: MFC/R2 – Summary
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