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)： 48/61頁
文件大?。?/td> 551K
代理商： PXB 4330 E
PXB 4330 E
Semiconductor Group
48
Application Note 11.98
a) the 100% sure solution:
MBS reservation for every VBR-nrt VC, i.e. sum of all MBS’s determines the
needed global buffer space for the VBR-nrt traffic classes
b) simplified solution (no re-adjustment):
Analytical investigations reveal that, up to a certain number of VC’s, a limit for buffer
usage is reached even if the number of VC’s increases to
∞ (
a detailed description
is given in
Section 1.9.2
, page 50).
As global buffer EPD thresholds (BufNrtEPD) are not useful for VBR-nrt (as VBR-nrt is
already policed), BufNrtEPD of VBR.2 and VBR.3 has to be set to maximum value
FFFF
H
.
TrafClassMax (= threshold #6) has to be set at minimum to a value which contains the
necessary amount of guaranteed buffer space for VBR.2 and VBR.3 (= threshold #4
-threshold #3) in order to make possible the usage of this guaranteed buffer space.
TrafClassMax of VBR.2 and VBR.3 could have the same value.
ABR, GFR and UBR
BufNrtMax/BufNrtEPD of ABR is normally similar to those of GFR (probably even
concerning all types of thresholds).
BufNrtMax of ABR should be chosen about 70% to 80% of the global buffer and
BufNrtEPD of ABR about 50% to 60%. BufNrtEPD of ABR should be approximately in
the order of magnitude of the BufNrtMax for UBR. For simplification no BufNrtEPD of
ABR will be used (due to the existence of ABR CI thresholds).
In this example global buffer EPD threshold for ABR isn’t used, i.e. BufNrtEPD of ABR
has to be set to maximum value FFFF
H
.
The global buffer maximum fill/PPD thresholds #3 (BufNrtMax of ABR, GFR and UBR)
have the same values. TrafClassMax is set to maximum value FFFF
H
as the
BufNrtMax/BufNrtEPD thresholds of ABR/GFR/UBR are the lowest one of all traffic
classes. So in the case of exclusive ABR,GFR or UBR traffic during a longer time period
only global buffer occupation up to these global thresholds BufNrtMax/BufNrtEPD is
possible and so always enough buffer space is available for the higher priority traffic
classes VBR.2 and VBR.3.
For GFR there is the global buffer EPD CLP1 threshold #1 (represented by the registers
UEC/DEC; "Low water mark" according to [
4
]) and the global buffer EPD threshold #2
(BufNrtEPD of GFR, "High water mark" according to [
4
]). The thresholds implemented in
the ABM for GFR match exactly the definition in [
4
].
Note: For this example applies that the UBR traffic consists only of packets (framebased
UBR). This guarantees that UBR traffic is limited by its EPD threshold #1 and
therefore the buffer space between this EPD threshold #1 and the PPD threshold
#3 is available for ABR and GFR.
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