LINE TYPE
       Type of line over which this link operates.
       NONSWITCHED -  The line is a nonswitched line.
       SWITCHED    -  The line is a switched line.
    MAXIMUM PDU SIZE
       Maximum frame size, in octets, that this station will receive and
       transmit. This value includes the frame header.
    PHYSICAL PORT
       Name of the Physical layer port with which the link is associated.
    PROTOCOL STATE
       State of the LAPB protocol with respect to the remote station.
       ERROR         - The protocol is in a recognized error state.
       HALTED        - The protocol has halted.
       INITIALIZING  - The protocol is being initialized.
       INOPERATIVE   - The protocol cannot be started without connectivity to
                       the remote station.
       MAINTENANCE   -  The link is in maintenance mode.
       RESETTING     - The protocol is undergoing a reset operation.
       RUNNING       - The protocol is running normally.
    STATE
       Status of the lapb link entity.
       OFF  - The link is disabled.
       ON   - The link is enabled.