A SCSI connector ( ) is used to connect computer parts that use a system called
SCSI
Small Computer System Interface (SCSI, ) is a set of standards for physically connecting and transferring data between computers and peripheral devices. The SCSI standards define commands, protocols, electrical, optical and logical interface ...
to communicate with each other. Generally, two connectors, designated male and female, plug together to form a connection which allows two components, such as a computer and a disk drive, to communicate with each other. SCSI connectors can be
electrical connector
Components of an electrical circuit are electrically connected if an electric current can run between them through an electrical conductor. An electrical connector is an electromechanical device used to create an electrical connection between ...
s or
optical connectors. There have been a large variety of SCSI connectors in use at one time or another in the computer industry. Twenty-five years of evolution and three major revisions of the
standard Standard may refer to:
Symbols
* Colours, standards and guidons, kinds of military signs
* Standard (emblem), a type of a large symbol or emblem used for identification
Norms, conventions or requirements
* Standard (metrology), an object th ...
s resulted in requirements for
Parallel SCSI
Parallel SCSI (formally, SCSI Parallel Interface, or SPI) is the earliest of the interface implementations in the SCSI family. SPI is a parallel bus; there is one set of electrical connections stretching from one end of the SCSI bus to the othe ...
connectors that could handle an 8, 16 or 32 bit wide
bus
A bus (contracted from omnibus, with variants multibus, motorbus, autobus, etc.) is a road vehicle that carries significantly more passengers than an average car or van. It is most commonly used in public transport, but is also in use for cha ...
running at 5, 10 or 20
megatransfer/s, with
conventional or
differential signaling
Differential signalling is a method for electrically transmitting information using two complementary signals. The technique sends the same electrical signal as a differential pair of signals, each in its own conductor. The pair of conducto ...
. Serial SCSI added another three transport types, each with one or more connector types. Manufacturers have frequently chosen connectors based on factors of size, cost, or convenience at the expense of compatibility.
SCSI makes use of
cable
Cable may refer to:
Mechanical
* Nautical cable, an assembly of three or more ropes woven against the weave of the ropes, rendering it virtually waterproof
* Wire rope, a type of rope that consists of several strands of metal wire laid into a hel ...
s to connect devices. In a typical example, a socket on a computer
motherboard
A motherboard (also called mainboard, main circuit board, mb, mboard, backplane board, base board, system board, logic board (only in Apple computers) or mobo) is the main printed circuit board (PCB) in general-purpose computers and other expand ...
would have one end of a cable plugged into it, while the other end of the cable plugged into a disk drive or other device. Some cables have different types of connectors on them, and some cables can have as many as 16 connectors (allowing 16 devices to be wired together). Different types of connectors may be used for devices inside a computer cabinet, than for external devices such as scanners or external disk drives.
Nomenclature
Many connector designations consist of an abbreviation for the connector family, followed by a number indicating the number of pins. For example, "CN36" (also written "CN-36" or "CN 36") would be a 36-pin
Centronics-style connector. For some connectors (such as the
D-subminiature
The D-subminiature or D-sub is a common type of electrical connector. They are named for their characteristic D-shaped metal shield. When they were introduced, D-subs were among the smallest connectors used on computer systems.
Description, n ...
family) use of the hyphen or space is more common, for others (like the "DD50") less so.
Parallel SCSI
![SCSI 2 Devices](https://upload.wikimedia.org/wikipedia/commons/6/6e/SCSI_2_Devices.jpg)
Parallel SCSI (''SCSI Parallel Interface SPI'') allows for attachment of up to 8 devices (8-bit Narrow SCSI) or 16 devices (16-bit Wide SCSI) to the SCSI bus. The SCSI Host controller takes up one slot on the SCSI bus, which limits the number of devices allowed on the bus to 7 or 15 devices respectively. SCSI Host Controllers may have multiple SCSI buses (e.g.
Adaptec
Adaptec was a computer storage company and remains a brand for computer storage products. The company was an independent firm from 1981 to 2010, at which point it was acquired by PMC-Sierra, which itself was later acquired by Microsemi, which itse ...
AHA-2940) to allow more SCSI devices to be attached.
Internal
IDC header
Early generations of SCSI
hard drive assemblies generally had two connectors (power and communication). Some very early 16-bit units used two data connectors, with three connectors in total. The power connector was typically the same 4-pin female
Molex connector used in many other internal computer devices. The communication connectors on the drives were usually a 50 (for 8-bit SCSI) or 68 pin male (for 16-bit SCSI) "
IDC header" which has two rows of pins, 0.1 inches apart. This connector has no retaining screws to secure the connectors together, and
ribbon cable
A ribbon cable (also known as multi-wire planar cable) is a cable with many conducting wires running parallel to each other on the same flat plane. As a result, the cable is wide and flat. Its name comes from its resemblance to a piece of ribb ...
s are both inconveniently wide and somewhat delicate, so this connector style was primarily used for connections inside of a computer or peripheral enclosure (as opposed to connecting two enclosures to each other). Thus it is often called an "internal SCSI connector." This type of header was used in a typical desktop PC until around 2010, including the 40-pin (two rows of 20) version used for
ATA fixed and optical disk drives.
While the female connector is slotted such that a cable with a matching keyed male connector can not be inserted upside-down, some manufacturers (including
Sun Microsystems
Sun Microsystems, Inc. (Sun for short) was an American technology company that sold computers, computer components, software, and information technology services and created the Java programming language, the Solaris operating system, ZFS, the ...
) supplied internal cables with male connectors that did not have the key, allowing for incorrect (and possibly damaging) connections.
In most cases, the
host adapter
In computer hardware, a host controller, host adapter, or host bus adapter (HBA), connects a computer system bus, which acts as the host system, to other network and storage devices. The terms are primarily used to refer to devices for conne ...
would have a similar header-style connection. In some cases, though, the host adapter end of the cable would use a different connector. For example, in the Sun 260 series chassis (used for the
Sun 3/260 and
Sun 4/260 computers), the connector was the same 3-row 96-pin connector used to attach peripheral cards to the
VMEbus
VMEbus (Versa Module Europa or Versa Module Eurocard bus) is a computer bus standard, originally developed for the Motorola 68000 line of CPUs, but later widely used for many applications and standardized by the IEC as ANSI/IEEE 1014-1987. I ...
backplane
A backplane (or "backplane system") is a group of electrical connectors in parallel with each other, so that each pin of each connector is linked to the same relative pin of all the other connectors, forming a computer bus. It is used as a backbo ...
.
SCA
Eventually, there was a desire to combine power and data signals into a single connector. This allows for quick drive replacement, more reliable connections, and is more compact.
Most late parallel SCSI disk-drives utilize an 80-pin
SCA
SCA may refer to:
Biology and health
* Sickle cell disease, also known as sickle cell anaemia
* Spinocerebellar ataxia, a neurological condition
* Statistical coupling analysis, a method to identify covarying pairs of amino acids in protein mult ...
(Single Connector Attachment) connector. This connector includes a power connection and also has long and short pins which enable
hot swapping
Hot swapping is the replacement or addition of components to a computer system without stopping, shutting down, or rebooting the system; hot plugging describes the addition of components only. Components which have such functionality are said ...
. Note that this connector is primarily found on disk drive
HDAs (and of course the mating enclosure backplane connector).
External
Most typically, external drive enclosures will have female connectors, while cables will have two male connectors. As with everything SCSI, there are exceptions.
First generation
Standardization was perhaps less consistent in the early days of SCSI manufacture.
Early SCSI interfaces commonly used a 50-pin
micro ribbon
The micro ribbon or miniature ribbon connector is a common type of electrical connector for a variety of applications, such as in computer and telecommunications equipment having many contacts.
The connector contains two parallel rows of ...
connector. This connector is similar to the 36-pin connector used by
Centronics
Centronics Data Computer Corporation was an American manufacturer of computer printers, now remembered primarily for the parallel interface that bears its name, the Centronics connector.
History
Foundations
Centronics began as a division o ...
for the
parallel interface
In computing, a parallel port is a type of interface found on early computers (personal and otherwise) for connecting peripherals. The name refers to the way the data is sent; parallel ports send multiple bits of data at once (parallel c ...
on their printers, thus the connector became popularly known as "Centronics SCSI" or "CN-50". It is also referred to as a "SCSI-1 connector"; since many connectors have been used for SCSI-1, this can be confusing.
Apple
An apple is an edible fruit produced by an apple tree (''Malus domestica''). Apple fruit tree, trees are agriculture, cultivated worldwide and are the most widely grown species in the genus ''Malus''. The tree originated in Central Asia, wh ...
used
DB-25
The D-subminiature or D-sub is a common type of electrical connector. They are named for their characteristic D-shaped metal shield. When they were introduced, D-subs were among the smallest connectors used on computer systems.
Description, no ...
connectors, which, having only 25 pins rather than 50,
were smaller and less expensive to make, but decreased signal integrity (increasing
crosstalk
In electronics, crosstalk is any phenomenon by which a signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel. Crosstalk is usually caused by undesired capacitive, induc ...
) and cannot be used with differential signaling. Furthermore, DB-25s were commonly used for RS-232 serial cables and also to connect parallel printers, meaning that users might accidentally try to use completely inappropriate cables, since the printer and serial cables would fit the connector properly and be hard to visually distinguish.
Sun Microsystems and
Data General
Data General Corporation was one of the first minicomputer firms of the late 1960s. Three of the four founders were former employees of Digital Equipment Corporation (DEC).
Their first product, 1969's Data General Nova, was a 16-bit minicomputer ...
used a 50-pin 3-row
DD-50 connector, which was sometimes incorrectly called a "DB-50" or "HDB-50". Sun also used DB-25s on a few products.
Digital Equipment Corporation
Digital Equipment Corporation (DEC ), using the trademark Digital, was a major American company in the computer industry from the 1960s to the 1990s. The company was co-founded by Ken Olsen and Harlan Anderson in 1957. Olsen was president unt ...
mostly used the CN-50, but the
VAXstation 3100 and
DECstation 3100/2100 made use of a MALE 68-pin connector on the rear of the workstation. This connector looks like it would be a high density Wide SCSI-2 connector, but is actually 8-bit SCSI-1.
Apple Macintosh
The Mac (known as Macintosh until 1999) is a family of personal computers designed and marketed by Apple Inc. Macs are known for their ease of use and minimalist designs, and are popular among students, creative professionals, and software en ...
laptops used a squarish external SCSI connector called an HDI-30 (High Density Interconnect) on the laptop itself (not on the peripheral end of the cable, unless two laptops were being connected). These machines also had the interesting ability to become "
SCSI slaves" (officially known as "
SCSI Disk Mode" in Apple documentation), meaning that they could appear to be disk drives when attached to another computer's SCSI controller (a feature later reimplemented over
FireWire
IEEE 1394 is an interface standard for a serial bus for high-speed communications and isochronous real-time data transfer. It was developed in the late 1980s and early 1990s by Apple in cooperation with a number of companies, primarily Sony an ...
and
Thunderbolt
A thunderbolt or lightning bolt is a symbolic representation of lightning when accompanied by a loud thunderclap. In Indo-European mythology, the thunderbolt was identified with the 'Sky Father'; this association is also found in later Hell ...
for later, non-SCSI Mac hardware).
IBM's early
RS6000
The RISC System/6000 (RS/6000) is a family of RISC-based Unix servers, workstations and supercomputers made by IBM in the 1990s. The RS/6000 family replaced the IBM RT PC computer platform in February 1990 and was the first computer line to s ...
workstations sometimes used a "High Density Centronics" connector, which was a Centronics-style connector with smaller pins and shell. For some reason it had 60 pins, and is thus known as the "HDCN60"
Certain Japanese digital camera manufacturers wanted to put SCSI into their equipment, but conventional connectors would have been too large. Like IBM, they used a miniaturized Centronics connector, but this one had 50 pins, and was called the "HPCN50".
Some manufacturers used a
DC-37
The D-subminiature or D-sub is a common type of electrical connector. They are named for their characteristic D-shaped metal shield. When they were introduced, D-subs were among the smallest connectors used on computer systems.
Description, n ...
connector, often incorrectly referred to as a DB-37. These will most commonly be seen on three-cable systems, which are typically 16-bit or 32-bit "Wide SCSI" systems. Extra confusion is generated here since this connector was also frequently used with
SMD disk drives, which are completely incompatible with SCSI drives.
SCSI-2
With the arrival of SCSI-2, the situation was a bit less chaotic. For narrow SCSI, most manufacturers used the MD50, also sometimes referred to as a Micro DB50, High Density or HD50, Half-Pitch or HP50, or MiniHonda. This connector has two rows of 25 pins and a trapezoidal (D-shaped) shell, and is about 1 3/8” (36mm) wide.
A few vendors did use the Micro Centronics 50, and IBM continued to use the HDCN60 on some RS-6000 systems.
For Wide SCSI-2, the most common connector was the larger sibling of the MD50, known as the MD68, HD68, MiniD68, or HPDB68. This is about 1 7/8” (47mm) wide. IBM used the HDCN68 on some RS-6000 systems, and it seems likely that a few other manufacturers used other alternatives.
Post SCSI-2
![SCA-2 connector on Fujitsu MAP3735NC](https://upload.wikimedia.org/wikipedia/commons/2/28/SCA-2_connector_on_Fujitsu_MAP3735NC.jpg)
As time went on, some manufacturers desired connectors even smaller than the SCSI-2 connector. One such in somewhat common use was the
VHDCI (Very High Density Cable Interconnect) connector, also known as an "AMP HPCN68M" (a manufacturer part number), and sometimes as "SCSI-5". There are 68 pins on the connector in two rows; the pins are 0.8 mm apart. This connector is reputed to suffer fewer bent pins than the 68-pin SCSI-2 connector despite its minuscule pins.
Interoperability
There are adapters between most types of parallel SCSI connector, and some companies will manufacture custom cables to guarantee having the correct connectors. An adapter from narrow to wide must include termination to work properly.
Different SCSI standards use the same SCSI connectors as in HVD and LVD SCSI (High Voltage Differential and Low Voltage Differential) . HVD uses 15V while LVD uses 3.3V, so connecting an HVD device to an LVD host bus adaptor can blow the line drivers on the HBA, likewise an HVD HBA connected to an LVD device.
Similarly, connecting a (slow) SE single-ended device onto a (fast) LVD SCSI chain will cause the HBA to sync down to the lowest speed.
While interconnectivity of a number of devices may look straightforward, there are many pitfalls, and with older SE devices the cabling length becomes an issue as signal degrades.
Drive caddies
Many manufacturers have devised systems in which a SCSI disk drive or other device was placed in a small "caddy" container (also called a "
drive sled"), which carried connections for both power and data. The caddy or canister would be placed in a larger enclosure. Some of these systems allowed for
hot swap
Hot swapping is the replacement or addition of components to a computer system without stopping, shutting down, or rebooting the system; hot plugging describes the addition of components only. Components which have such functionality are said ...
(drives could be replaced with the system running), while others allowed "
warm swap
Warm, WARM, or Warmth may refer to:
* A somewhat high temperature
* Kindness
Music
* ''Warm'' (The Lettermen album), 1967, and the title song
* ''Warm'' (Johnny Mathis album), 1958, and the title song
* ''Warm'' (Herb Alpert album), 1969
* '' ...
", in which the SCSI bus was "quiesced" (meaning all drive activity was stopped) but remained powered on with devices ready.
Digital Equipment Corporation's
StorageWorks products were one system of this type. DEC briefly allowed third parties to license this system, but reversed the decision after less than a year; as a result, third-party StorageWorks products are quite rare.
Compaq
Compaq Computer Corporation (sometimes abbreviated to CQ prior to a 2007 rebranding) was an American information technology company founded in 1982 that developed, sold, and supported computers and related products and services. Compaq produced ...
also made a drive caddy system for the
Proliant
ProLiant is a brand of server computers that was originally developed and marketed by Compaq and currently marketed by Hewlett Packard Enterprise. After Compaq merged with Hewlett-Packard (HP), HP retired its NetServer brand in favor of the P ...
line of servers. Compaq purchased DEC, and
Hewlett-Packard
The Hewlett-Packard Company, commonly shortened to Hewlett-Packard ( ) or HP, was an American multinational information technology company headquartered in Palo Alto, California. HP developed and provided a wide variety of hardware components ...
later purchased Compaq, and the Proliant and StorageWorks names were reused on other storage products, including later hot-swap systems.
Some of these caddy systems were
OEM
An original equipment manufacturer (OEM) is generally perceived as a company that produces non-aftermarket parts and equipment that may be marketed by another manufacturer. It is a common industry term recognized and used by many professional or ...
manufactured, which means that the same product could appear with numerous brand names and model identifications.
These Hot-Plug drives in caddies generally use 80 pin
SCA
SCA may refer to:
Biology and health
* Sickle cell disease, also known as sickle cell anaemia
* Spinocerebellar ataxia, a neurological condition
* Statistical coupling analysis, a method to identify covarying pairs of amino acids in protein mult ...
connectors (HP, Compaq, DELL from SCSI-3 to Ultra-320)
Single Connector Attachment
Single Connector Attachment, or SCA, is a type of connection for the internal cabling of
Parallel SCSI
Parallel SCSI (formally, SCSI Parallel Interface, or SPI) is the earliest of the interface implementations in the SCSI family. SPI is a parallel bus; there is one set of electrical connections stretching from one end of the SCSI bus to the othe ...
systems. There are two versions of this connector: the SCA-1, which is deprecated, and SCA-2, which is the most recent standard. In addition there are Single-Ended (SE) and
Low Voltage Differential (LVD) types of the SCA.
SCA is no longer in widespread use, having been superseded by
Serial attached SCSI.
Since hard disk drives are among the components of a server computer that are the most likely to fail, there has always been demand for the ability to replace a faulty drive without having to shut down the whole system. This technique is called
hot-swapping
Hot swapping is the replacement or addition of components to a computer system without stopping, shutting down, or rebooting the system; hot plugging describes the addition of components only. Components which have such functionality are said ...
and is one of the main motivations behind the development of SCA. In connection with
RAID
Raid, RAID or Raids may refer to:
Attack
* Raid (military), a sudden attack behind the enemy's lines without the intention of holding ground
* Corporate raid, a type of hostile takeover in business
* Panty raid, a prankish raid by male college ...
, for example, this allows for seamless replacement of failed drives.
Normally, hard disk drives make use of two cables: one for data and one for power, and they also have their specific parameters (SCSI ID etc.) to be set using
jumpers
Jumper or Jumpers may refer to:
Clothing
* Jumper (sweater), a long-sleeve article of clothing; also called a top, pullover, or sweater
**A waist-length top garment of dense wool, part of the Royal Navy uniform and the uniform of the United Stat ...
on each drive. Drives employing SCA have only one plug which carries both data and power and also allows them to receive their configuration parameters from the SCSI backplane. The SCA connector for
parallel SCSI
Parallel SCSI (formally, SCSI Parallel Interface, or SPI) is the earliest of the interface implementations in the SCSI family. SPI is a parallel bus; there is one set of electrical connections stretching from one end of the SCSI bus to the othe ...
drives has 80 pins, as opposed to the 68 pin interface found on most modern parallel SCSI drives.
Some of the pins in SCA connectors are longer than others, so they are connected first and disconnected last. This ensures the electrical integrity of the whole system. Otherwise, the angle at which the plug is inserted into the drive could be the reason for damage because, for instance, the pin carrying the
voltage
Voltage, also known as electric pressure, electric tension, or (electric) potential difference, is the difference in electric potential between two points. In a static electric field, it corresponds to the work needed per unit of charge to m ...
could get connected before its corresponding
ground reference pin.
The additional length also provides what is known as a pre-charge which provides a means whereby the device is alerted to a pending power surge. That allows a slower transition to full power and thereby makes the device more stable.
To make better use of their hot-plugging capability, SCA drives usually are installed into
drive bay
A drive bay is a standard-sized area for adding hardware to a computer. Most drive bays are fixed to the inside of a case, but some can be removed.
Over the years since the introduction of the IBM PC, it and its compatibles have had many form f ...
s into which they slide with ease. At the far end of these bays is the backplane of the SCSI subsystem located with a connector that plugs into the drive automatically when it is inserted.
Full hot-swappable functionality still requires the support of other software and hardware components of the system. In particular the operating system and
RAID
Raid, RAID or Raids may refer to:
Attack
* Raid (military), a sudden attack behind the enemy's lines without the intention of holding ground
* Corporate raid, a type of hostile takeover in business
* Panty raid, a prankish raid by male college ...
layers will need hot-swap support to enable hard drive hot-swapping to be carried out without shutting down the system.
Serial SCSI
Serial SCSI disk-drives use smaller connectors due to the reduced number of signals required. There are three types of physical layer transports specified:
*
Fibre Channel
Fibre Channel (FC) is a high-speed data transfer protocol providing in-order, lossless delivery of raw block data. Fibre Channel is primarily used to connect computer data storage to servers in storage area networks (SAN) in commercial data cen ...
, also called FC
* SAS,
Serial Attached SCSI
* SSA, the
Serial Storage Architecture
Serial Storage Architecture (SSA) was a serial transport protocol used to attach disk drives to server computers.
History
SSA was invented by Ian Judd of IBM in 1990. IBM produced a number of successful products based upon this standard before ...
Additionally, there is the
iSCSI
Internet Small Computer Systems Interface or iSCSI ( ) is an Internet Protocol-based storage networking standard for linking data storage facilities. iSCSI provides block-level access to storage devices by carrying SCSI commands over a TCP/IP ...
transport, which is not present on the drives themselves, but is used to connect devices using
TCP/IP
The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...
networks. The drives themselves would use one of the other three connector types.
Connectors on internal drives
* Fibre Channel FC-AL disk-drives include a 40-pin
SCA-2 connector
* SSA disk drives include a "unitized" composite connector
* SAS disk drives have an
SFF-8482 connector. This is "form factor compatible" with the connector on
SATA
SATA (Serial AT Attachment) is a computer bus interface that connects host bus adapters to mass storage devices such as hard disk drives, optical drives, and solid-state drives. Serial ATA succeeded the earlier Parallel ATA (PATA) standard to ...
disk drives, meaning that a SATA drive may be installed in an SAS drive bay, and the enclosure can use the ''Serial ATA Tunneling Protocol'' (STP) to make use of the drive.
There are keyed parts to the connector on an SAS drive that will prevent it from being inserted into a SATA drive bay.
* iSCSI isn't used for connecting disk drives internally
External connectors
*Fibre Channel
**FC-AL cables initially used
DE-9 connectors (electrical) or
SC connectors (optical)
**More recent FC-AL cables use
HSSDC connectors (electrical) or
LC connectors (optical).
**Many FC-AL products now use an intermediate device called a
GBIC
A gigabit interface converter (GBIC) is a standard for transceivers, first defined in 1995 and commonly used with Gigabit Ethernet and Fibre Channel for some time. By offering a standard, hot swappable electrical interface, a single gigabit por ...
(GigaBit Interface Converter) which allows more flexibility. GBICs can interconnect with a range of
SFP
SFP may refer to:
Organizations
* Salton Inc. (former stock symbol: SFP), now part of Russell Hobbs, Inc.
* Swedish People's Party of Finland, a Swedish minority and mainly liberal party in Finland
* Syrian Free Press, a Syrian social news networ ...
(Small Form-factor Pluggable) connectors.
*
SAS interconnections use either
![SFF-8484-internal-connector-0a](https://upload.wikimedia.org/wikipedia/commons/2/22/SFF-8484-internal-connector-0a.jpg)
**
SFF-8484 multilane unshielded serial attachment connector (internal connector)
**
SFF-8470 multilane copper connector, also known as an Infiniband connector (external connector)
**
SFF-8087 Molex iPASS unshielded mini-multilane, reduced width internal connector
**
SFF-8088 Molex iPASS shielded mini-multilane, reduced width external connector
*SSA cables are terminated with 9-pin
micro-D
The D-subminiature or D-sub is a common type of electrical connector. They are named for their characteristic D-shaped metal shield. When they were introduced, D-subs were among the smallest connectors used on computer systems.
Description, n ...
connectors
*iSCSI may be interconnected by any means used to build a TCP/IP network, since the SCSI commands are simply being carried over TCP/IP.
Ethernet
Ethernet () is a family of wired computer networking technologies commonly used in local area networks (LAN), metropolitan area networks (MAN) and wide area networks (WAN). It was commercially introduced in 1980 and first standardized in 198 ...
is the predominantly used physical layer.
Drive caddies
The situation is fundamentally similar to that of Parallel SCSI drive caddies; there have been a range of manufacturers, and the caddies themselves contain a generic device (with one of the standard internal connectors) which can be removed and replaced.
See also
*
Fibre Channel electrical interface
The Fibre Channel electrical interface is one of two related Fibre Channel standards that can be used to physically interconnect computer devices. The other standard is a Fiber-optic communication, Fibre Channel optical interface, which is not co ...
, for details of the SCA-40 connector
*
SAF-TE
In computer storage, SAF-TE (abbreviated from SCSI Accessed Fault-Tolerant Enclosure) is an industry standard to interface an enclosure in-band to a (parallel) SCSI subsystem in order to gain access to information or control for various elements ...
- active backplanes for sensoring and swap assistance
References
{{DEFAULTSORT:Scsi Connector
Connector
Computer connectors