"VITA 46.9-2010.pdf标准规范及勘误解释"
The "VITA 46.9-2010.pdf" is a standard specification document that pertains to the PMC/XMC Rear I/O Fabric Signal Mapping on 3U and 6U VPX Modules. It is an official English version document published by the ANSI/VITA organization. The document addresses an errata that was released on May 1, 2013, which deals with the clarification of positive and negative signal swapping. The issue mentioned in the document pertains to the swapping of positive and negative signals between the data plane pin field and the XMC rear I/O pin field on the modules specified in the standard. The document explains that in certain profiles within this specification, the positive and negative signals of each pair are swapped. This is done to ensure compatibility and standardization across the different modules that adhere to this specification. The document also mentions that in many cases, this polarity reversal will not cause any issues because most receivers are capable of performing polarity reversal. This suggests that the standard has taken into account the compatibility of different modules and their ability to handle polarity reversal. However, it is also mentioned that when this standard undergoes its 5-year review, the working group will further investigate this issue and consider any necessary modifications or improvements. This indicates that the organization is committed to continuously improving the standard and addressing any potential issues that may arise. In conclusion, the "VITA 46.9-2010.pdf" standard specification document is an official publication by the ANSI/VITA organization that addresses the PMC/XMC Rear I/O Fabric Signal Mapping on 3U and 6U VPX Modules. It clarifies the issue of positive and negative signal swapping and mentions that in most cases, this polarity reversal should not cause any issues. However, the working group responsible for the standard will review and address this matter further during its 5-year review process.
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