欢迎访问ic37.com |
会员登录 免费注册
发布采购

PM7348 参数 Datasheet PDF下载

PM7348图片预览
型号: PM7348
PDF下载: 下载PDF文件 查看货源
内容描述: [ATM/SONET/SDH IC, CMOS, PBGA324,]
分类和应用: ATM异步传输模式
文件页数/大小: 318 页 / 1736 K
品牌: PMC [ PMC-SIERRA, INC ]
 浏览型号PM7348的Datasheet PDF文件第74页浏览型号PM7348的Datasheet PDF文件第75页浏览型号PM7348的Datasheet PDF文件第76页浏览型号PM7348的Datasheet PDF文件第77页浏览型号PM7348的Datasheet PDF文件第79页浏览型号PM7348的Datasheet PDF文件第80页浏览型号PM7348的Datasheet PDF文件第81页浏览型号PM7348的Datasheet PDF文件第82页  
S/UNI-IMA-4 Telecom Standard Product Data Sheet  
Released  
Rate Changes  
When the RIPP changes the state of a link to active, it programs the appropriate IDCC scheduler  
with the new rate. This is done by providing a vector that identifies the active LIDs for the  
group. This vector is used to determine the number of links for the rate calculation and is then  
passed on to the TIMA or RDAT to indicate the LIDs to include in the round robin. The IDCC  
will only change its rate at IMA frame boundaries.  
10.2.6 Support of IMA Test Pattern Procedure  
S/UNI-IMA-4 supports the IMA test pattern procedure in both the TX direction (NE initiated)  
and RX direction (FE initiated).  
In the TX direction, the S/UNI-IMA-4 updates the TX test control info and TX test pattern field  
in the outgoing ICP cells, as prompted by the relevant Update_test_ptn command. PM must  
take care to wait at least 2 frames in between updates to the test pattern in order to comply with  
the IMA test pattern standard. Meanwhile, the S/UNI-IMA-4 will always compare the RX test  
pattern field received in the incoming ICP cells with the TX test pattern value being transmitted,  
and save the result on a per-link basis in the group context memory.  
In the RX direction, the S/UNI-IMA-4 always analyzes the TX test control info field in the  
incoming ICP cells. If the test link command field is set to “active”, the TX test pattern field in  
the incoming ICP cells on the selected link will be copied to the RX test pattern field in the  
outgoing ICP cells. Otherwise the RX test pattern field in the outgoing ICP cells will be filled  
with “0xFF”.  
10.2.7 Support of Symmetric/Asymmetric Operation Modes  
S/UNI-IMA-4 supports all three possible group symmetry modes: symmetric configuration and  
symmetric operation; symmetric configuration and asymmetric operation; asymmetric  
configuration and asymmetric operation.  
For symmetric configuration, the number of TX and RX links in the group must be the same;  
for asymmetric configuration, that restriction does not apply.  
The support for asymmetric/symmetric operation modes is part of the S/UNI-IMA functionality.  
The symmetric operation mode is treated as a special case of the asymmetric operation, where  
the TX and RX LSM on the same physical link are inter-dependent.  
10.2.8 Support of Different IMA Versions  
It should be noted that the technique used to report RX information over the Link Information  
fields in the ICP cells when the group is configured in the symmetrical configuration and  
operation mode differs in the IMA v1.1 implementations and the IMA v1.0 implementations.  
The details of the differences between IMA v1.1 and IMA v1.0 can be found in appendix C of  
the ATM Forum IMA 1.1 specification.  
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.  
Document No.: PMC-2020889, Issue 2  
78