Modem Connect Line Interchange Circuits

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

    carrier detect        CF          Received Line Signal Detector

    clear to send         CB          Clear to Send

    data set ready        CC          DCE Ready

    data terminal ready   CD          DTE Ready

    local loopback        LL          Local Loopback

    remote loopback       RL          Remote Loopback

    request to send       CA          Request to Send

    ring indicator        CE          Ring Indicator

    signalling rate       CI          Data Signal Rate Selector (DCE)
    indicator

    signalling rate       CH          Data Signal Rate Selector (DTE)
    selector

    test mode             TM          Test Mode