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28-1189: [REDACTED] Look up scu in Wiktionary, the free dictionary. SCU may refer to: Computing [ edit ] SAS control unit, a hardware component that controls Serial attached SCSI devices Single compilation unit , C/C++ specific compilation technique System Control Unit for Sega Saturn chip set Education [ edit ] Santa Clara University , California, United States Sapporo City University , Japan Scott Christian University , Machakos, Kenya Shih Chien University , Taipei, Taiwan Sichuan University , Chengdu, China Seoul Cyber University , Seoul, Korea Soochow University (disambiguation) , multiple schools Southern California University of Health Sciences , Whittier, California Southern Cross University , Lismore, NSW, Australia Southwestern Christian University , Bethany, Oklahoma Suez Canal University , Ismailia, Egypt Shahid Chamran University , Ahvaz, Iran Soegijapranata Catholic University , Semarang, Indonesia Unions [ edit ] Scottish Cyclist's Union,

56-453: A 6 Gbit/s physical rate led the development of an equivalent SATA speed. In 2013, 12 Gbit/s followed in the SAS-3 specification. SAS-4 is slated to introduce 22.5 Gbit/s signaling with a more efficient 128b/150b encoding scheme to realize a usable data rate of 2,400 MB/s while retaining compatibility with 6 and 12 Gbit/s. Additionally, SCSI Express takes advantage of

84-496: A SAS interface, but head, media, and rotational speed of traditional enterprise-class SATA drives, so they cost less than other SAS drives. When compared to SATA, NL-SAS drives have the following benefits: International Committee for Information Technology Standards The InterNational Committee for Information Technology Standards ( INCITS ), (pronounced "insights"), is an ANSI -accredited standards development organization composed of Information technology developers. It

112-524: A SCSI device name, which identifies the SAS device uniquely in the world. One does not often see these device names because the port identifiers tend to identify the device sufficiently. For comparison, in parallel SCSI, the SCSI ID is the port identifier and device name. In Fibre Channel , the port identifier is a WWPN and the device name is a WWNN. In SAS, both SCSI port identifiers and SCSI device names take

140-410: A Serial SCSI Protocol target port for access to a peripheral device. An expander is not necessary to interface a SAS initiator and target but allows a single initiator to communicate with more SAS/SATA targets. A useful analogy: one can regard an expander as akin to a network switch in a network, which connects multiple systems using a single switch port. SAS 1 defined two types of expander; however,

168-623: A professional wrestling stable often referred to as SCU Sacra Corona Unita , a Mafia-like criminal organization from Apulia, southern Italy SCU Lightning Complex fires , a group of wildfires in California Sculptor Capital Management , an American alternative asset management firm (stock symbol SCU) Senatus consultum ultimum , something tantamount to martial law in the times of the Roman Republic Service Class User,

196-475: A service delivery subsystem. Each SAS port in a SAS domain has a SCSI port identifier that identifies the port uniquely within the SAS domain, the World Wide Name . It is assigned by the device manufacturer, like an Ethernet device's MAC address , and is typically worldwide unique as well. SAS devices use these port identifiers to address communications to each other. In addition, every SAS device has

224-425: A subtractive port and the other via a non-subtractive port. SAS-1.1 topologies built with expanders generally contain one root node in a SAS domain with the one exception case being topologies that contain two expanders connected via a subtractive-to-subtractive port. If it exists, the root node is the expander, which is not connected to another expander via a subtractive port. Therefore, if a fanout expander exists in

252-497: A term used in the DICOM standard Sacra Corona Unita , an Italian criminal organization See also [ edit ] [REDACTED] Search for "scu" on Misplaced Pages. All pages with titles beginning with SCU All pages with titles beginning with Scu All pages with titles containing scu Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with

280-417: Is available with up to 24 Gbps; with SAS-5 under development, according to T10 . The physical SAS connector comes in several different variants: The most common connection for SAS drives connecting to backplanes in servers, i.e. PowerEdge and ProLiant Also known as a U.2 port along with SFF-8639. 8X: 74 Nearline SAS (abbreviated to NL-SAS , and sometimes called midline SAS ) drives have

308-558: Is guided by its Executive Board . The INCITS Executive Board established more than 40 Technical Committees, Task Groups and Expert Groups that are constantly developing standards for new technologies and updating standards for older products. An open, collaborative community that enhances the competitiveness of U.S. organizations and brings technological advancement to society through the development and promotion of consensus-driven U.S. and global Information Technology standards. More than 2000 standards have been created and approved through

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336-553: The International Committee for Information Technology Standards (INCITS) develops and maintains the SAS protocol; the SCSI Trade Association (SCSITA) promotes the technology. A typical Serial Attached SCSI system consists of the following basic components: A SAS Domain is the SAS version of a SCSI domain—it consists of a set of SAS devices that communicate with one another by means of

364-883: The MACV-SOG during the Vietnam War Street Crimes Unit , part of the New York Police Department Santa Clara Unit, an operational unit of the California Department of Forestry and Fire Protection responsible for the East and South Bay regions of the Bay Area. Other uses [ edit ] Antonio Maceo Airport in Santiago de Cuba, Cuba (IATA airport code: SCU) SoCal Uncensored ,

392-784: The PCI Express infrastructure to directly connect SCSI devices over a more universal interface. SAS architecture consists of six layers: An initiator may connect directly to a target via one or more PHYs (such a connection is called a port whether it uses one or more PHYs, although the term wide port is sometimes used for a multi-PHY connection). The components known as Serial Attached SCSI Expanders (SAS Expanders) facilitate communication between large numbers of SAS devices. Expanders contain two or more external expander-ports. Each expander device contains at least one SAS Management Protocol target port for management and may contain SAS devices itself. For example, an expander may include

420-464: The INCITS process, with many more in development. American National Standards are voluntary and serve U.S. interests well because all materially affected stakeholders have the opportunity to work together to create them. INCITS-approved standards only become mandatory when, and if, they are adopted or referenced by the government or when market forces make them imperative. Given the responsibilities and

448-429: The SAS wiring and signaling are compatible with and have loosely tracked that of SATA up to the 6 Gbit/s rate, although SAS defines more rigorous physical signaling specifications as well as a wider allowable differential voltage swing intended to allow longer cabling. While SAS-1.0 and SAS-1.1 adopted the physical signaling characteristics of SATA at the 3 Gbit/s rate with 8b/10b encoding , SAS-2.0 development of

476-480: The SAS-2.0 standard has dropped the distinction between the two, as it created unnecessary topological limitations with no realized benefit: Direct routing allows a device to identify devices directly connected to it. Table routing identifies devices connected to the expanders connected to a device's own PHY. Subtractive routing is used when you are not able to find the devices in the sub-branch you belong to. This passes

504-447: The US and joint ISO / IEC committees worldwide. This provides a mechanism to create standards that will be implemented in many nations. As such, INCITS' Executive Board also serves as ANSI's Technical Advisory Group for ISO/IEC Joint Technical Committee 1. JTC 1 is responsible for International standardization in the field of information technology. INCITS operates through consensus. INCITS

532-487: The configuration, it must be the domain's root node. The root node contains routes for all end devices connected to the domain. Note that with the advent in SAS-2.0 of table-to-table routing and new rules for end-to-end zoning, more complex topologies built upon SAS-2.0 rules do not contain a single root node. SAS connectors are much smaller than traditional parallel SCSI connectors . Commonly, SAS-3 provides for point data transfer speeds up to 12 Gbit/s. Currently, SAS-4

560-713: The expenditures associated with U.S. participation in international standards activities, INCITS considers participation as a "P" member of ISO/IEC JTC 1, as a declaration of support for the international committee's technical work. INCITS policy is to adopt as "Identical" American National Standards all ISO/IEC or ISO standards that fall within its program of work, with exceptions as outlined in our procedures. Accordingly, INCITS will adopt as "Identical" American National Standards all ISO/IEC or ISO standards that fall within its program of work. Similarly, INCITS will withdraw any such adopted American National Standard that has been withdrawn as an ISO/IEC or ISO International Standards. INCITS

588-638: The form of a SAS address , which is a 64 bit value, normally in the NAA IEEE Registered format. People sometimes refer to a SCSI port identifier as the SAS address of a device, out of confusion. People sometimes call a SAS address a World Wide Name or WWN, because it is essentially the same thing as a WWN in Fibre Channel. For a SAS expander device, the SCSI port identifier and SCSI device name are

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616-437: The link is routed to a single expander connected to a subtractive routing port. If there is no expander connected to a subtractive port, the end-device cannot be reached. Expanders with no PHYs configured as subtractive act as fanout expanders and can connect to any number of other expanders. Expanders with subtractive PHYs may only connect to two other expanders at a maximum, and in that case they must connect to one expander via

644-491: The request to a different branch altogether. Expanders exist to allow more complex interconnect topologies. Expanders assist in link-switching (as opposed to packet-switching) end-devices (initiators or targets). They may locate an end-device either directly (when the end-device is connected to it), via a routing table (a mapping of end-device IDs and the expander the link should be switched to downstream to route towards that ID), or when those methods fail, via subtractive routing:

672-526: The same SAS address. There is little physical difference between SAS and SATA. The Serial Attached SCSI standard defines several layers (in order from highest to lowest): application, transport, port, link, PHY and physical. Serial Attached SCSI comprises three transport protocols: For the Link and PHY layers, SAS defines its own unique protocol. At the physical layer , the SAS standard defines connectors and voltage levels. The physical characteristics of

700-519: The sports governing body for cycling in Scotland, now known as Scottish Cycling Service Credit Union , New Hampshire Sikorsky Credit Union , Connecticut Steinbach Credit Union , Canada Units [ edit ] Serious Crash Unit , a New Zealand television series Scoville Units on the Scoville scale measure the hotness or piquancy of sauces Special Commando Unit, employed by

728-528: The title SCU . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=SCU&oldid=1217454393 " Categories : Disambiguation pages Educational institution disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Serial attached SCSI The T10 technical committee of

756-691: Was established in 1961 as the Accredited Standards Committee X3, Information Technology and is sponsored by Information Technology Industry Council (ITI), a trade association representing providers of information technology products and services then known as the Business Equipment Manufacturers Association (BEMA) and later renamed the Computer and Business Equipment Manufacturers' Association (CBEMA). The first organizational meeting

784-661: Was formerly known as the X3 and NCITS . INCITS is the central U.S. forum dedicated to creating technology standards. INCITS is accredited by the American National Standards Institute (ANSI) and is affiliated with the Information Technology Industry Council, a global policy advocacy organization that represents U.S. and global innovation companies. INCITS coordinates technical standards activity between ANSI in

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