The entity hierarchy for the Modem Connect module is:

    Node___Modem_Connect____Data_Port
                          |
                          |_Line

    The MODEM CONNECT entity is the top-level entity in the hierarchy
    of entities belonging to the Modem Connect module.

    The MODEM CONNECT DATA PORT entity is associated with a line and
    handles the transfer of data. Data ports are created and deleted
    automatically when a client of the Modem Connect module uses a
    line. The port-id is the data port managed by this command.

    A MODEM CONNECT LINE entity is associated with a physical circuit
    on the node. Usually, there is one line entity for each circuit.
    The line-id is the line managed by this command.   The MODEM
    CONNECT LINE entity has an extra set of status attributes
    that let you examine the instantaneous status of the interchange
    circuits on the line. These circuit attributes are known by different
    names in the various interface standards. For instance, the
    DATA TERMINAL READY attribute is the name used for the CCITT V.24
    circuit 108/2, the EIA-232-D CD circuit, the RS-499 TR circuit,
    and so on. For further information, refer to the Network Control
    Language Reference manual.