NET$MGMT_HELP.HLB  —  LAPB
    The LAPB module implements one of the protocols in the Link layer described
    by the Digital Network Architecture.

    You must install the product DEC WAN Device Drivers before you can refer
    to the LAPB Module entities in an NCL command.

    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.

1  –  character

    VERSION
       Default:  None                         Version:  Current version number

       Version number of the DNA HDLC architecture to which this implementation
       conforms. You cannot modify this characteristic.

2  –  LINK

    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.

2.1  –  character

    ACKNOWLEDGE TIMER
       Default:  Supplied by profile                   Value:  1--60000

       Time, in milliseconds, to wait for an acknowledgment before initiating
       recovery action. This attribute corresponds to the LAPB parameter T1.
       You can modify this characteristic only when the entity is disabled.

    HOLDBACK TIMER
       Default:  Implementation specific               Value:  0--60000

       Delay, in milliseconds, before an acknowledgment must be sent. This
       characteristic corresponds to the LAPB parameter T2. You can modify this
       characteristic only when the entity is disabled.

    INTERFACE TYPE
       Default:  DTE                                    Value:  DCE or DTE

       Address mode for this link.

       DCE    - Use DCE address mode.

       DTE    - Use DTE address mode.

       You can modify this characteristic only when the entity is disabled.

    MAXIMUM DATA SIZE
       Default:  Supplied by profile                    Value:  1--65532

       Maximum frame size, in octets, of an information field in an I-frame.

    PHYSICAL LINE
       Default:  No default                           Value: Local-entity-name

       Name of the Physical layer and line entity over which the LAPB protocol
       is to operate. You must give this characteristic a value before you
       enable the link.

    POLL TIMER
       Default:  Implementation specific             Value: Supplied by profile

       Maximum period in seconds that may elapse without frames being exchanged
       on the Data Link.  On expiration, an RR(P) is sent to elicit a response
       from the other end.

    PROFILE
       Default:  No default                            Value:  String

       Name of the X.25 Level 2 Profile that defines subscription details
       associated with the PSDN to which this DTE is connected. You cannot
       modify this characteristic. This characteristic is set by means of an
       argument to the create command.

    RECEIVE BUFFERS
       Default:  Implementation specific               Value:  1--128

       Specifies the number of receive data buffers.

    RETRY MAXIMUM
       Default:  Supplied by profile                   Value:  1--255

       Maximum number of times that a frame will be retransmitted before
       assuming a fatal error, at which point more drastic error recovery
       action will be attempted. This characteristic corresponds to the LAPB
       parameter N2.

    SEQUENCE MODULUS
       Default:  Supplied by profile                   Value:  8 or 128

       Type of sequence numbering.

         8    - Use normal sequence numbering.

         128  - Use extended sequence numbering.

    WINDOW SIZE
      Default:  Supplied by profile                   Value:  1--127

      Window size for transmitting and receiving I-frames. This characteristic
      corresponds to the LAPB parameter K.

2.2  –  counter

    BUFFER UNAVAILABLE ERRORS

       Number of times that the underlying framing level has indicated system
       buffer unavailability to the Data Link layer.

    CRC ERRORS RECEIVED

       Number of frames received with a bad CRC.

    DATA OCTETS RECEIVED

       Number of data octets received from the remote station. This value does
       not include retransmissions.

    DATA OCTETS SENT

       Number of data octets sent to the remote station. This value does not
       include retransmissions.

    DATA PDUS RECEIVED

       Number of I-frames received from the remote station. This value does not
       include retransmissions.

    DATA PDUS SENT

       Number of I-frames sent to the remote station. This value does not
       include retransmissions.

    FRMRS RECEIVED

       Number of FRMR frames received.

    FRMRS SENT

       Number of FRMR frames generated as a result of invalid incoming frames.

    POLLS RECEIVED

       Number of command frames received with the P-bit set.

    REJS RECEIVED

       Number of REJ frames received.

    REJS SENT

       Number of REJ frames transmitted.

    RNRS RECEIVED

       Number of RNR frames received.

    RNRS SENT

       Number of RNR frames transmitted.

    TIMES ACKNOWLEDGE TIMER EXPIRED

       Number of times the local acknowledge timer has expired.

    TIMES LINK HALTED

       Number of times the link halt event has been generated.

     TIMES LINK INITIALIZING

       Number of times the link initializing event has been generated.

     TIMES LINK INOPERATIVE

       Number of times the link inoperative event has been generated.

    TIMES LINK MAINTENANCE

       Number of times the link maintenance event has been generated.

    TIMES LINK RESETTING

       Number of times the link reset event has been generated.

    TIMES LINK RUNNING

       Number of times the link running event has been generated.

    TIMES LINK SETUP FAILED

       Number of times the link setup failure event has been generated.

    TIMES LINK STATE CHANGED

       Number of times a link state transition has occurred.

    TIMES PDU RECEIVE OVERRUN

       Number of times a physical line indicated an overrun condition to the
       Data Link layer.

    TIMES PDU TRANSMIT FAILED

       Number of times an attempt to transmit a frame has failed.

2.3  –  status

    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.

3  –  port

    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.

3.1  –  status

    CLIENT NAME

       Name of the client with which the port is associated.

    LINK

       Name of the link with which the port is associated.

    STATE

       State of the lapb port entity.

       OPEN          - The port is assigned to a client.

       OPEN DISABLED - The port is assigned to a client, but the associated
                       link is disabled.

    TYPE

       Type of port.

       SEQUENCED    - The port is used for sending LAPB data.

       UNSEQUENCED  - The port is used for sending loopback data.  This is only
                      possible if the maintenance mode characteristic of the
                      relevant lapb link entity is set to true.
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