參數(shù)資料
型號： PXB 4330 E
廠商： SIEMENS AG
英文描述： ATM Buffer Manager(異步傳輸模式緩沖器管理器)
中文描述： 緩沖區(qū)管理器自動柜員機(jī)（異步傳輸模式緩沖器管理器）
文件頁數(shù)： 31/61頁
文件大?。?/td> 551K
代理商： PXB 4330 E
PXB 4330 E
ABM Buffer Configuration
Semiconductor Group
31
Application Note 11.98
/* The threshold type query "BufNrtMax = maximum fill threshold" means
that the control bits (ABRen, EPDen...) in
Table 2
, page 13 are set
according to the required values for the maximum fill threshold of
BufNrtMax as depicted in
Table 2
, page 13. Only in this case the ABM
examines whether this threshold is exceeded. This mechanism applies for
each other threshold type query in this pseudocode. The PPD threshold
query happens only for one time (per cell arrival) in the PPD algorithm
and "Evaluation of Accept_flag"as PPD can be done if any discard threshold
(= maximum fill or EPD threshold) is exceeded. If an EPD threshold is
exceeded so the activation of PPD has no effect. Thus only if a maximum
fill threshold is exceeded the activation of PPD leads to PPD behavior.
That’s what we want because a PPD threshold is a maximum fill threshold
plus PPDen=’1’.*/
/* Evaluation if global buffer EPD threshold for this traffic class is
exceeded */
if (TotalBufferOcc_nrt
≥
BufNrtEPD)
then
if BufNrtEPD = EPD threshold
then
EPD_globalBuffer = 1;
end if
/* Evaluation if global buffer EPD CLP1 threshold ("Low water mark") for
this traffic class is exceeded */
if (TotalBufferOcc_nrt
≥
UEC/DEC)
then
if UEC/DEC = EPD CLP1 threshold for GFR
then
EPD_CLP1_globalBuffer = 1;
end if
/* Evaluation if maximum fill threshold for this traffic class is exceeded
*/
if (TrafficClassOcc
≥
TrafClassMax)
then
if TrafClassMax = maximum fill threshold
then
Accept_flag = 0;
end if
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