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PM7340 参数 Datasheet PDF下载

PM7340图片预览
型号: PM7340
PDF下载: 下载PDF文件 查看货源
内容描述: S / UNI ATM反向多路复用, 8个环节 [S/UNI INVERSE MULTIPLEXING FOR ATM, 8 LINKS]
分类和应用: ATM集成电路SONET集成电路SDH集成电路电信集成电路电信电路异步传输模式
文件页数/大小: 334 页 / 2670 K
品牌: PMC [ PMC-SIERRA, INC ]
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PM7340 S/UNI-IMA-8  
PRELIMINARY  
INVERSE MULTIPLEXING OVER ATM  
DATA SHEET  
PMC-2001723  
ISSUE 3  
INVERSE MULTIPLEXING OVER ATM  
Figure 19  
- IMA Error/Maintenance State Diagram  
Persistence of non-IMA Sync  
Leaving IMA  
Sync state  
γ
( +2) IMA frames  
Out of IMA  
Frame (OIF)  
Anomaly  
State  
IMA  
LIF  
Working State  
Defect  
Entering IMA  
Sync state  
Persistence of IMA SYNC for at least 2 IMA frames  
The IMA Working state enables the RDAT to write user cells to the DCB. If the  
IFSM leaves the IMA Sync state, the IESM state machine will transition to the  
OIF Anomaly state, and the OIF anomaly counter will be incremented.  
In the OIF Anomaly state, incoming user cells are written as filler cells to the  
DCB, and write pointers are incremented. If the IFSM does not return to the IMA  
Sync state within gamma + 2 frames, the IESM state will transition to the LIF  
Defect state. (Gamma is programmable, and is the same gamma used in the  
IFSM). If the IMA Sync state is entered prior to gamma + 2 frames, the IESM  
state will transition back to the IMA Working State. This is considered a “fast  
recovery” from the OIF Anomaly.  
In the LIF Defect state, incoming user cells are written as filler cells to the DCB,  
and write pointers are incremented. The LIF-latched status bit will be set in the  
link-context memory. The IESM state machine will transition to the IMA Working  
state when IMA Sync has been detected for two consecutive IMA frames. If the  
IMA Sync state is entered and then exited during LIF, then the OIF anomaly  
counter will be incremented. When the IESM enters the working state, user cells  
may be forwarded once again if an overrun (with respect to the configured depth  
for the link) is not detected. The overrun detection provides the necessary  
differential-delay checking required after a defect.  
10.2.4.3.2  
Loss of Cell Delineation Status (LCD)  
LCD is detected by the TC layer and the information is passed to the RDAT.  
When a link is in LCD, a LCD-latched status bit is set in link context memory,  
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE  
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