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)： 23/61頁
文件大?。?/td> 551K
代理商： PXB 4330 E
PXB 4330 E
ABM Buffer Configuration
Semiconductor Group
23
Application Note 11.98
Backward Direction
The next BRM cell which arrives in the queue of the downstream direction (= DnQID) is
assigned the updated CI/NI bits. The EFCI- and CI/NI update occurs per queue (not per
VC) and therefore for each user cell or BRM cell which leaves such a queue is updated
also if several ABR connections share one queue.
The CI/NI marking mechanism is explained in a more detailed way in the following
section.
1.6.1
The same LCI and the same QID are necessary for an ABR connection in forward (=
upstream) and backward direction (= downstream), e.g. in forward direction LCI=2 and
UpQID=7, in backward direction LCI=2 and DnQID=7.
Figure 5
depicts the conditions given in the bi-directional operation mode (see [
1
],
page 17) of the ABM. However the mechanism for updating CI/NI and marking the BRM
cell is analogous in the bi-directional and uni-directional mode (with one or both ABM
cores).
In bi-directional mode the same LCI and same QID for upstream and downstream
direction have to be chosen per terminal.
So for terminal A the LCI in upstream direction is LCI
1
and also it is the same in the
downstream direction. Additionally the upstream QID (UpQID=7) is the same as the
downstream QID (DnQID=7). This also applies to terminal B. Description of BRM
marking for terminal A:
A is sending ABR cells in upstream direction (= forward direction of A) in the ABM queue
with UpQID=7 (left side ABM). At every ABR cell arrival the CI/NI-flags are updated in
the Queue Configuration Table of the opposite direction (downstream queue DnQID=7).
Queuing in the left side ABM occurs due to the bottleneck over the switching network.
The ABR cell then passes through the ATM switching network and arrives at the
downstream queue with DnQID=8 (right side ABM). At this arrival occurs again a CI/NI-
flags update in the Queue Configuration Table of the opposite direction (upstream queue
UpQID=8). Queuing in the right side ABM occurs due to the PHY bottleneck.
The arriving FRM cell of A is looped back as BRM cell by terminal B (backward direction
of A). When this BRM leaves the upstream queue (with UpQID=8) the CI/NI bits of the
BRM are updated (using CI/NI bits updated by the last forward direction cell).
Then the BRM passes through the switching network and arrives at the downstream
queue (DnQID=7). In the left side ABM the CI/NI bits of the BRM cells are updated again.
Bi-directional Mode
1)
See [
1
], page 52
2)
See [
1
], page 49
相關(guān)PDF資料
PDF描述
PXB4219E Interworking Element for 8 E1/T1 Lines
PXB4220E Interworking Element for 8 E1/T1 Lines
PXB4221E Interworking Element for 8 E1/T1 Lines
PXB4219 IWE8 Interworking Element for 8 E1/T1 Lines
PXB4221 IWE8 Interworking Element for 8 E1/T1 Lines
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PXB4330EV1.1 制造商:Infineon Technologies AG 功能描述:SP000007503_ABM 制造商:Rochester Electronics LLC 功能描述:- Bulk
PXB4330EV1.1-G 制造商:Infineon Technologies AG 功能描述:
PXB4330EV2.1 制造商:Rochester Electronics LLC 功能描述:- Bulk
PXB4340E 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Communications
PXB4340EV1.1-G 制造商:Infineon Technologies AG 功能描述:
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*