The LAPB module implements one of the protocols in the Link layer
    described by the Digital Network Architecture.

                                NOTE

    For Tru64 UNIX, the WAN Device Drivers are provided as an
    installable subset within the product HP Wide Area Network Support
    for Tru64 UNIX.  You must install this subset before you can refer
    to LAPB module entities in an NCL command.

    For OpenVMS, you must install the WAN Device Drivers from the
    HP X.25 for OpenVMS product before you can refer to the LAPB
    module entities in an NCL command.

1  –  Subentities

    The entity hierarchy of the LAPB module is:

    Node___LAPB____Link
                 |
                 |_Port

    The LAPB entity is the top-level entity in the LAPB module
    hierarchy of entities. The LAPB module implements the LAPB
    link-level protocol which is a variation of the HDLC link-level
    protocol.

    A LAPB LINK entity is associated with a port of the supporting
    Physical layer, and contains attributes that describe local LAPB
    operation. The simple-name refers to the link managed by this
    command.

    A LAPB PORT entity represents an access point for LAPB module
    clients to Data Link layer services. The port-name refers to the
    port managed by this command.