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）
文件頁數(shù)： 24/61頁
文件大?。?/td> 551K
代理商： PXB 4330 E
PXB 4330 E
ABM Buffer Configuration
Semiconductor Group
24
Application Note 11.98
Once CI=’1’ or NI=’1’ bit on the BRM cell set it cannot be overwritten to ’0’ by other BRM
updates along the remaining backward path.
Figure 5
ABR CI/NI Marking in the BRM Cell for the Bi-directional
Mode of the ABM
1.6.2
Independent of using one or both ABM cores, the LSB of the LCI’s and QID’s of an ABR
connection have to be inverted (= toggle LSB) e.g. in forward direction LCI=3 and
UpQID=7, in backward direction LCI=2 and DnQID=6.
ABR CI/NI marking occurs analogous to bi-directional mode in
Figure 5
.
Uni-directional Mode
1.6.3
The differences are based on the usage of the ABM cores due to the respective ABM
mode and the assignment of the LCIs from a connection to the available cores.
Table 8
shows the register flags concerned with regard to bi- and uni-directional ABM mode.
In bi-directional mode the LCI revaluation from LCI
1
to LCI
2
and vice versa of a
connection occurs in the upstream direction of the respective ASP. In uni-directional
mode there is no ATM switching network which consists of ASPs and ASMs. Hence the
LCI revaluation is performed by LCI toggle within the ABM (see [
1
], page 19).
Differences Between the ABM Modes Concerning ABR
A
B
ATM Switching
Network
VPI/VCI
1
VPI/VCI
1
VPI/VCI
2
VPI/VCI
2
ABM
BRM
update
BRM
update
Check ABR thresholds and adjust CI/NI
CI/NI
CI/NI
DnQID=7
UpQID=7
Check ABR thresholds and adjust CI/NI
ABM
BRM
update
BRM
update
DnQID=8
UpQID=8
CI/NI
CI/NI
Check ABR thresholds and adjust CI/NI
Check ABR thresholds and adjust CI/NI
A,B = Terminals with a ABR connection
between them
LCI = Local Connection Identifier
UpQID = upstream QID
DnQID = downstream QID
BRM = backward RM cell
CI/NI = Congestion Indication/No Increase-flags
ATM Switching Network = one or a combination of the PXB 4310 ASM chip
(ASM = ATM Switching Matrix)
A
S
P
A
S
P
A
L
P
P
H
Y
A
L
P
P
H
Y
LCI
1
LCI
1
LCI
2
LCI
2
Note: *) upstream queuing due to switching network bottleneck
**) downstream queuing due to PHY bottleneck
*)
*)
**)
**)
= bottleneck
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