o  active base

    Default: 255           Value: 0-255

    Specifies the base priority to which an active tributary is reset
    after it has been polled.

    This characteristic is supported only if the characteristic
    protocol of the owning ddcmp link entity is set to control.

 o  active increment

    Default: 0             Value: 0-255

    Specifies the value to be added to the active tributary priority
    each time the scheduling timer expires.

    This characteristic is supported only if the characteristic
    protocol of the owning ddcmp link entity is set to control.

 o  address

    Default: 1             Value: 1-255

    Data link address of the remote station or tributary. You can
    modify this characteristic only when the entity is disabled.

 o  babble timer

    Default: 6000          Value: 1-65535

    Specifies the time, in milliseconds, for which a selected
    tributary or remote station is allowed to transmit. This
    characteristic is not used on full-duplex links.

    This characteristic is not supported if the characteristic
    protocol of the owning ddcmp link entity is set to tributary.

 o  buffer source

    Default:  Implementation-specific    Value: See description

    Specifies the source of the receive buffers.

    client         Buffers are provided by the client entity.
    supplied

    common pool    Buffers are assigned from the common buffer pool.

    This characteristic is supported only if the characteristic
    protocol of the owning ddcmp link entity is set to control. You
    can modify this characteristic only when the entity is disabled.

 o  dead threshold

    Default: 8             Value: 0-255

    Specifies the number of times that an active, inactive, or dying
    tributary is polled before its status attribute polling substate
    is changed to dead because of receive timeouts.

    This characteristic is supported only if the characteristic
    protocol of the owning ddcmp link entity is set to control.

 o  dying base

    Default: 0             Value: 0-255

    Specifies the base priority to which a dying tributary is reset
    after being polled.

    This characteristic is supported only if the characteristic
    protocol of the owning ddcmp link entity is set to control.

 o  dying increment

    Default: 16            Value: 0-255

    Specifies the value to be added to a dying tributary's priority
    each time the scheduling timer expires.

    This characteristic is supported only if the characteristic
    protocol of the owning ddcmp link entity is set to control.

 o  dying threshold

    Default: 2             Value: 0-255

    Specifies the number of times an active or inactive tributary is
    polled before its status attribute polling substate is changed to
    dying because of receive timeouts.

    This characteristic is supported only if the characteristic
    protocol of the owning ddcmp link entity is set to control.

 o  holdback timer

    Default: 0             Value: 0-13000

    Maximum time (in milliseconds) that the local station can delay
    acknowledging a received message if there is no data to send.

    The value of this characteristic is linked to the retransmit
    timer used on the remote station. A suggested value is between
    10% and 20% of that timer. However, the actual values you can use
    may be limited by the communications product.

    The default value indicates that no holdback is used and the
    local station must acknowledge immediately.

 o  inactive base

    Default: 0             Value: 0-255

    Specifies the priority to which an inactive tributary is reset
    after it has been polled.

    This characteristic is supported only if the characteristic
    protocol of the owning ddcmp link entity is set to control.

 o  inactive increment

    Default: 64            Value: 0-255

    Specifies the value to be added to an inactive tributary's
    priority each time the scheduling timer expires.

    This characteristic is supported only if the characteristic
    protocol of the owning ddcmp link entity is set to control.

 o  inactive threshold

    Default: 8             Value: 0-255

    Specifies the number of times an active tributary is polled
    before its status attribute polling substate is changed to
    inactive because of no data response.

    This characteristic is supported only if the characteristic
    protocol of the owning ddcmp link entity is set to control.

 o  maximum buffers

    Default: 4             Value: Implementation specific

    Specifies the maximum number of buffers that a tributary can
    use from the common buffer pool. A value of 0 means that
    there is no limit to the number of buffers that can be used.
    This characteristic is supported only if the buffer source
    characteristic is set to common pool.

    This characteristic is supported only if the characteristic
    protocol of the owning ddcmp link entity is set to control. You
    can modify this characteristic only when the entity is disabled.
    Also, you can only increase the characteristic value.

 o  maximum transmit

    Default: 4             Value: 1-255

    Specifies the maximum number of messages that a tributary or a
    remote half-duplex station can send at one time. The value of
    this characteristic must be greater than or equal to that of
    transmit window on the selected station.

    This characteristic is not supported if either of the following
    conditions is true:

    o  The characteristic protocol of the owning ddcmp link entity is
       set to tributary.

    o  The communications link is full-duplex and point-to-point.

    You cannot modify this characteristic.

 o  polling state

    Default: Automatic     Value: See description.

    Specifies the effect of the local station's polling algorithm
    on the state of a tributary. The value of this characteristic is
    reflected in the value of the status attribute polling substate.

    active     The state is locked to active.

    automatic  The state varies according to the operation of the
               polling algorithm.

    dead       The state is locked to dead.

    dying      The state is locked to dying.

    inactive   The state is locked to inactive.

    This characteristic is supported only if the characteristic
    protocol of the owning ddcmp link entity is set to control.

 o  transmit timer

    Default: 0             Value: 0-65535

    Specifies the time, in milliseconds, that the local station waits
    between data transmissions.

    This characteristic is supported only if the characteristic
    protocol of the owning ddcmp link entity is set to control.

 o  transmit window

    Default: 1             Value: 1-255

    Specifies the maximum number of data messages that the local
    station can send without receiving an acknowledgment. This
    characteristic applies only when the remote station is a control
    station or on a half-duplex, point-to-point link. The value of
    this characteristic must be less than or equal to the equivalent
    of the maximum transmit characteristic on the control station or
    remote station.