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(dòng)柜員機(jī)（異步傳輸模式緩沖器管理器）
文件頁數(shù)： 43/61頁
文件大?。?/td> 551K
代理商： PXB 4330 E
PXB 4330 E
Semiconductor Group
43
Application Note 11.98
Real-Time Traffic
CBR.1 and VBR.1(rt)
BufNrtMax and BufNrtEPD are thresholds for nrt-traffic, hence they are not used.
Therefore they have to be set to the maximum value FFFF
H
.
Table 11
Threshold Configuration to Example 1
Traffic
Class
Thresholds
Unit
BufNrt
Max
256
1)
BufNrt
EPD
256
TrafClass
Max
256
SbMax
EpdCi
256
e.g. 50% of
total buffer
= 32768
e.g. 50% of
total buffer
= 32768
QMaxEPD
64
QCICLP1
4
CBR.1
n.a.
2)
n.a.
256
256
n.a.
cells
VBR.1
(rt)
n.a.
n.a.
256
256
n.a.
cells
VBR.2
(nrt)
FFFF
H
- rt
= 64k-512
= 65024
n.a.
50-80% of
total buffer
= 32768
(50%)
50-80% of
total buffer
= 32768
(50%)
e.g. 50% of
total buffer
= 32768
max. MBS
3)
+
δ
δ
= about
4..20 cells
4)
cells
VBR.3
(nrt)
e.g. 10% <
VBR.2 =
58368
n.a.
e.g. 50% of
total buffer
= 32768
max. MBS
3)
+
δ
δ
= about
4..20 cells
cells
GFR
e.g. 10% <
VBR.3 =
52480
e.g. 20%
< GFR
PPD =
41728
e.g. 20%
< UBR
PPD =
37632
n.a.
e.g. 50% of
total buffer
= 32768
>>
MBS
≥
MFS
cells
UBR
e.g. 10% <
GFR =
47104
n.a.
e.g. 50% of
total buffer
= 32768
≤
e.g. 75% of
BufNrtEPD of
UBR = 28224
n.a.
cells
1)
Subscript value corresponds to the respective threshold granularity
2)
n.a. = not applicable i.e. it is not meaningful to use this threshold for this traffic class. Every unused threshold
has to be set to the maximum value FFFF
H
(besides the queue thresholds: QMaxEPD maximum value is
3FFF
H
and QCICLP1 maximum value is 3FF
H
; always eight ’1’ in the respective register) !
It is recommended to use the maximum MBS value of all queues of this traffic class for this ABM core.
3)
4)
It has to be a small value due to the fact that CLP 1 cells are transmitted only if the queue buffer is almost empty
(as CLP 1 cells are not calculated by the CAC).
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