參數(shù)資料
型號(hào)： 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(dòng)柜員機(jī)（異步傳輸模式緩沖器管理器）
文件頁數(shù)： 14/61頁
文件大?。?/td> 551K
代理商： PXB 4330 E
PXB 4330 E
ABM Buffer Configuration
Semiconductor Group
14
Application Note 11.98
Queue
QueueLengthMax = 16k cells
per HW limitation
maximum fill threshold
PPD threshold
maximum fill threshold x 0 x x x 0/1
PPD threshold
EPD threshold
maximum fill threshold
(CLP=1 cells)
PPD threshold
EPD GFR threshold
ABR CI threshold
x x x x x 0/1
x x 1 x x 0/1
Granularity 64
QmaxEPD(7:0)
see [
1
], TCT0, page 49
x 0 1 x x 0/1
x 1 x x x 0/1
Granularity 4
QCICLP1(7:0)
see [
1
], TCT0, page 49
x 0 x x 0 1
5)
x 0 1 x 0 1
6)
x 1 x x 0 0/1
1 x x x x 0/1
1)
x = don’t care, i.e. these bits are not considered for the calculation of the respective threshold.
2)
Only the lower 8 bits of these registers can be used.
3)
CLP-bit=’1’ means that only frames with CLP = ’1’ of any GFR traffic are discarded as long as that threshold is
exceeded ("Low water mark", see [
4
]).
4)
0 for GFR, 1 for UBR or ABR. For CBR and VBR traffic classes EPD is not useful because they are already
policed.
5)
CLP-bit=’1’ means that only cells with CLP = ’1’ are discarded if that threshold is exceeded. CLP-bit=’0/1’
indicates that this threshold is independent of the CLP-Bit, i.e. both cells with CLP = ’1’ and cells with CLP = ’0’
are discarded.
6)
This PPD threshold is triggered by CLP 1 cells only. The rest of the packet is discarded regardless of CLP.
Table 2
Threshold Type Assignment
Controlled
Area
Threshold
Threshold Type
Traffic
Class
Table
L
C
Upstream
Downstream
A
E
P
R
C
C
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