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（異步傳輸模式緩沖器管理器）
文件頁數(shù)： 12/61頁
文件大?。?/td> 551K
代理商： PXB 4330 E
PXB 4330 E
ABM Buffer Configuration
Semiconductor Group
12
Application Note 11.98
Global buffer EPD threshold BufNrtEPD is intended to be used for traffic classes which
are not already policed (=ABR, GFR and UBR).
EPD CLP1 Threshold for GFR
Acts like a normal EPD threshold but with the difference that it is a global threshold that
triggers EPD for CLP1 frames (not for CLP1 cells !) used by GFR service.
Note: Cell discarding of EPD and PPD thresholds does not apply to non-user cells, e.g.
an OAM cell in a packet is not discarded.
B) Indication Thresholds
ABR CI Threshold
This is used to indicate congestion state to ABR connections (ABRen=’1’) on a global
buffer, scheduler and queue basis. By exceeding one or a combination of these
thresholds EFCI, NI and CI bits of user cells and RM cells are set. NI is set in a slightly
congested situation. NI and CI are set in a congested situation.
Scheduler Indication Threshold
If the SchedOcc(15:0) exceeds this threshold the corresponding indication bit for this
scheduler in the registers LEVL0..2 or LEVH0..2 (see [
1
], page 61) is set to ’1’. This
threshold exists only in upstream ABM core.
The following
Table 2
gives an overview of all thresholds. For each arriving cell all
conditions in this table are checked. Several thresholds may be exceeded (see
Section
1.7
, page 28
).
Note: According to the cell acceptance algorithm of the ABM (see
Section 1.7
,
page 28), all threshold types are scanned at each cell arrival, independent
whether the individual threshold is actually used or not by the traffic class to which
the just arrived cell belongs. Therefore
Table 2
is no truth table ! For instance, if
the maximum fill threshold of UBMTH/DBMTH is scanned then all bits
(ABRen..CLPT) are don’t care as the ABM checks this threshold by ignoring the
values of these bits (hence e.g. PPDen can be ’1’ as the value of PPDen is ignored
during the scan of the basic mode of the maximum fill threshold). Until if the
selectable mode of the maximum fill threshold (i.e. the PPD threshold) is scanned,
the ABM checks the value of the bit PPDen and all other bits are don’t care
(according to
Table 2
).
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