SFF-8449 - HD MANAGEMENT INTERFACE v1.1

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Development *** THIS IS NOT A FINAL DRAFT *** SFF-8449 Rev 1.12.2 SFF SpecificationsThere are several projects active within the SFF Committee. The complete list ofspecifications which have been completed or are still being worked on are listed inthe specification at ftp://ftp.seagate.com/sff/SFF-8000.TXT2.3 SourcesThose who join the SFF Committee as an Observer or Member receive electronic copiesof the minutes and SFF specifications (http://www.sffcommittee.com/ie/join.html).Copies of ANSI standards may be purchased from the Inter-National Committee forInformation Technology Standards (http://tinyurl.com/c4psg).Copies of SFF, ASC T10 (SCSI), T11 (Fibre Channel) and T13 (ATA/SATA) standardsstill in development are available on the HPE version of CD_Access(http://tinyurl.com/85fts).2.4 ConventionsThe American convention of numbering is used (i.e., a comma separates the thousandsand higher multiples, and a period is used as the decimal point). This is equivalentto the ISO/IEC convention of a space and comma.American ISO0.6 0,61,000 1 0001,323,462.9 1 323 462,93. Definitions3.1 Fixed versus Free3.1.1 FixedThe terminology "fixed" is used to describe the gender of the mating side of theconnector that accepts its mate upon mating. This gender is frequently, but notalways, associated with the common terminology "receptacle". Other terms commonlyused are "female" and "socket connector". The term "fixed" is adopted from EIAstandard terminology as the gender that most commonly exists on the fixed end of aconnection, for example, on the board or bulkhead side.3.1.2 FreeThe terminology "free" is used to describe the gender of the mating side of theconnector that penetrates its mate upon mating. This gender is frequently, but notalways, associated with the common terminology "plug". Other terms commonly used are"male" and "pin connector". The term "free" is adopted from EIA standard terminologyas the gender that most commonly exists on the free end of a connection, forexample, on the cable side.3.2 Passive CableIn this standard, a passive cable only requires power to operate the managementinterface circuitry.HD Management Interface Page 6
Development *** THIS IS NOT A FINAL DRAFT *** SFF-8449 Rev 1.13.3 Active CableIn this standard, an active cable requires power for circuitry that is integral toany of the TX/RX high speed serial channels supported by the cable. In addition, theactive cable requires power to operate the management interface.4. General DescriptionThe external cable management interface provides a method for the fixed side todetermine the characteristics and status of the free side. In some implementations,the interface also provides a mechanism to control the operation of the free sidecircuitry. For the case where the free side is a cable, the fixed side can determineif the cable is passive, active copper, or active optical. Parameters such assupplier, part number, propagation delay and loss (for passive cables) can also bedetermined.4.1 Fixed-to-Free Side Block DiagramFigure 2 depicts the fixed-to-free side management interface. Note the limitationsin scope of SFF-8636.HD Management Interface Page 7
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SFF-8449 - HD MANAGEMENT INTERFACE v1.1

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