Specifications

50 CBI Buffer Formats HighWire MTP-2 - 1.2, September 4, 2002
num_cong_levels
num_cong_levelsnum_cong_levels
num_cong_levels
The number of levels (other than zero) used for transmission congestion
control.
If cong_method
cong_method cong_method
cong_method is CBI_CONG_CTRL_NATL_WITH_PRI or
CBI_CONG_CTRL_NATL_BUFFER, this field denotes how many entries are
valid in the cong_onset
cong_onset cong_onset
cong_onset, cong_abate,
cong_abate, cong_abate,
cong_abate, and possibly cong_discard
cong_discard cong_discard
cong_discard arrays.
The comments on those fields assume a value of 3, for clarity.
If cong_method
cong_method cong_method
cong_method is CBI_CONG_CTRL_NATL_TIMER, this field denotes the
number of congestion states allowed.
If cong_method
cong_method cong_method
cong_method is CBI_CONG_CTRL_INTERNATIONAL, this field is ignored.
The maximum value is 3.
cong_onset
cong_onsetcong_onset
cong_onset
Transmission congestion onset thresholds. At the end of this list of
parameters is a section, entitled “Transmission congestion onset and
abatement thresholds”, which provides more detail on the usage of this
parameter.
cong_abate
cong_abatecong_abate
cong_abate
Transmission congestion abatement thresholds. At the end of this list of
parameters is a section, entitled “Transmission congestion onset and
abatement thresholds”, which provides more detail on the usage of this
parameter.
cong_discard
cong_discardcong_discard
cong_discard
Congestion discard thresholds. At the end of this list of parameters is a
section, entitled “Transmission congestion discard thresholds”, which
provides more detail on the usage of this parameter.
The following fields (t_tx_dur
t_tx_durt_tx_dur
t_tx_dur, t_ty_dur,
t_ty_dur, t_ty_dur,
t_ty_dur, and initial_status
initial_status initial_status
initial_status) are only valid if
cong_method
cong_methodcong_method
cong_method is CBI_CONG_CTRL_NATL_TIMER.
t_tx_dur
t_tx_durt_tx_dur
t_tx_dur
Timer Tx. If the number of messages queued on L2’s transmit and retransmit
queues exceeds the transmission congestion onset threshold for the duration
of timer Tx, the congestion status increments by 1 (up to its limit). The units of
this field are milliseconds.
t_ty_dur
t_ty_durt_ty_dur
t_ty_dur
Timer Ty. If the number of messages queued on L2’s transmit and retransmit
queues is lower than the transmission congestion abatement threshold for
the duration of timer Ty, the congestion status decrements by 1 (down to its
limit). The units of this field are milliseconds.