SCSI Cables Information
Image credit: Tripp Lite; APC by Schneider Electric; Digi-Key Corporation
SCSI cables are used for high-speed bus connections between small computers and intelligent peripherals such as hard disks, printers, and optical disks. SCSI stands for small computer system interface, a set of standards for physically connecting computers to peripherals and transferring data.
Types of SCSI Cables
The GlobalSpec SpecSearch database contains information about these types of SCSI cables.
- SCSI-1 allows asynchronous data transfer rates of 1.5 Mbps and synchronous transfer rates up to 5 Mbps. SCSI-1 has an 8-bit port that uses a 50-pin connector and single-ended, open-collector drives.
- SCSI-2 has faster data transfer rates, better connectors, a wider bus path, parity checking, and better reliability via synchronous negotiation.
- Ultra2 SCSI or Fast-40 has a bus speed of 40 MHz. Narrow (8-bit) buses have a maximum data transfer rate of 40 Mbps. Wide (16-bit) buses have a maximum data transfer rate of 80 Mbps.
- SCSI-3 allows for faster data transfer rates and the use of up to 32 devices on a single chain. It incorporates serial connections in addition to the traditional parallel interconnect of SCSI-2. The serial interconnect of SCSI-3 incorporates three technologies: serial storage architecture (SSA), Fibre Channel, and IEEE P1394. The serial transfer mode allows faster data rates, more devices per bus, simple connectors and longer cables.
- Ultra3 SCSI (Fast-80, Ultra160) has a bus speed of 80 MHz. Wide (16-bit) buses have a maximum data transfer rate of 160 Mbps.
- Ultra320 SCSI has a maximum data transfer rate of 320 Mbps for the wide (16-bit) bus.
- Serial SCSI is a very fast bus standard that supports data transfer rates up to 400 Mbps. It is a subset of IEEE 1394 or FireWire®, a registered trademark of Apple Computers, Inc.
Other product specifications for SCSI cables include application, connector type, and gender.
An SCSI cable's intended use or application is important to consider when selecting a cable.
Audio/Visual (A/V) cables are used for audio and video applications, such as connecting speakers or monitors.
Computer cable is used for connecting computer-related peripheral devices, such as keyboards, mice, printers, and modems.
Network cables connect networking hubs, routers and switches.
Telecommunications cables are used in telecommunications applications.
A cable's end connectors are often determined by its intended application. The GlobalSpec SpecSearch database describes the following connector types:
Centronics® connectors are used with Centronics brand as well as third party peripherals.
A Centronics® connector. Image credit: Electro Standards Laboratories
DB connectors are used to connect computer peripherals. They are available with a variety of pin arrangements.
DB9 (9 pin) connectors. Image credit: APC by Schneider Electric
High speed serial data connection (HSSDC) connectors are designed to facilitate gigabit-per-second (Gbps) data transmission.
Internal 50 pin SCSI connectors are used with internal SCSI-1/SCSI-2 applications, such as hard drives, CD-ROMs, and removable storage drives.
Telco 50 connectors have 50 pins, and are used to connect printers and other peripherals.
Cable connectors are available in multiple gender configurations. Male connectors, sometimes called plugs, consist of a protrusion which fits into the female connector, sometimes known as a receptacle.
A male (left) and female (right) connector.
Image credit: Amphenol Alden Products Company
Common cable configurations include:
Male-Male: both ends of the cable terminate in a male connector.
Male-Female: the cable features a male connector on one end and a female on the other.
Female-Female: both ends of the cable terminate in a female connector.
Related Products & Services
Computer cables are used to connect monitors, keyboards, printers, hard drives, and other peripherals to computers.
Electrical Power Wires
Electrical power wires are solid or stranded conductors surrounded by insulation, shielding, and a protective jacket.
Ethernet cables are designed to support Ethernet, a standard protocol for the connection of computers in a local area network (LAN). They use twisted pair cables and modular connectors, and are designed to run at 10 Mbps, 100 Mbps, or 1 Gbps.
Network cables are used in the transmission of data across networks. Choices include Fibre Channel, FireWire or IEEE 1394, GPIB, serial, parallel, patch, SCSI, Ethernet and USB.
Patch Cables and Cords
Patch cables and cords are flexible cables that are terminated at both ends with a plug and used to interconnect circuits on patch panels. They are used with patch panels, groups of ports that connect lines between communications and electronic devices.
Serial cables are used for the serial transmission of data. They support communication standards such as RS232, RS422, and RS485, as well as Fibre Channel, IEEE 1394 or FireWire® (Apple Computer, Inc.), and universal serial bus (USB).
Video cables are used for the transmission of video signals, including monochrome, composite and component color video signals.