Modem Connect Line Interchange Circuits

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

    carrier detect        109         Data channel received line
                                      signal detector

    clear to send         106         Ready for sending

    data set ready        107         Data set ready

    data terminal ready   108/2       Data terminal ready

    local loopback        141         Local loopback

    remote loopback       140         Loopback/Maintenance test

    request to send       105         Request to send

    ring indicator        125         Calling indicator

    signalling rate       112         Data signal rate selector(DCE)
    indicator

    signalling rate       111         Data signal rate selector (DTE)
    selector

    test mode             142         Test indicator