Modem Connect Line Interchange Circuits

    NCL Attribute Name    Circuit     Description
    ----------------------------------------------------------------------

    carrier detect        M5          -

    clear to send         M2          -

    data set ready        M1          -

    data terminal ready   S1.2        -

    local loopback        PS3         -

    remote loopback       PS2         -

    request to send       S2          -

    ring indicator        M3          -

    signalling rate       not         -
    indicator             supported

    signalling rate       S4          -
    selector

    test mode             PM1         -