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(yè)數(shù)： 11/61頁(yè)
文件大?。?/td> 551K
代理商： PXB 4330 E
PXB 4330 E
ABM Buffer Configuration
Semiconductor Group
11
Application Note 11.98
1.4
Threshold Types
In
Table 2
the different threshold types are listed. The following is a short description of
each type :
A) Discard Thresholds
Total Buffer Threshold
Limits the total buffer size per ABM core (maximum 64k cells per ABM core) depending
on the RAM configuration (see [
1
],
Section 2.6
, page 42).
Maximum Fill Threshold
This threshold has two possible modes, a basic one (cell discarding) or a selectable one
(partial packet discarding = PPD).
1. Basic mode:
The maximum amount of storable cells without PPD and EPD function i. e. the
respective physical storage area. Each cell which exceeds that threshold is discarded.
If in the meantime the storage area fill level falls below that threshold the next arriving
cell is accepted again.
2. Selectable mode:
Every time a cell discarding occurs and PPDen=’1’ applies for the traffic class of this
cell, then also the remaining cells (besides non-user cells and the last cell of the
packet) of this packet are discarded. For simplification this selectable PPD behavior
of the maximum fill threshold is denoted as PPD threshold in the remaining document.
PPD Threshold
It is the maximum fill threshold in case of the selectable mode (see 2. under Maximum
Fill Threshold) and acts like an "emergency brake". The exceeding cell and all
subsequent cells (besides non-user cells and the last cell of this packet) of this packet
are also discarded if the fill level falls below that threshold in the meantime. See [
1
],
Section 1.7.6
, page 31.
PPD threshold is intended to be used for VBR-nrt, ABR, GFR and UBR.
Maximum Fill Threshold (CLP=1)
Acts like a normal maximum fill threshold but exclusively discards cells with CLP=’1’.
EPD Threshold
This is used for overload protection against bursty data traffic and so it is a "normal"
threshold for data traffic. See [
1
],
Section 1.7.6
, page 31.
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