See All Suppliers In This Area
Fill out as many options as you want. Click "Run Search Filter" at any time.

Product Type:

SCSI Standards:

Product Form Factor:

Single-ended SCSI (SE)?

Multimode (LVD / MSE)?

Differential SCSI:

Help with SCSI Products specifications:

Product Type
   Product Type:       
   Your choices are...         
   SCSI Host Adapter / Controller       The SCSI host adapter (also called SCSI card or SCSI controller) is a computer interface card that is installed in an expansion slot.  They are used to connect several devices and peripherals to the system using a daisy chain method. 
   SCSI Converter       A SCSI converter is a device designed to convert between the various SCSI interfaces such as single-ended to High Voltage Differential (HVD), or HVD to Low Voltage Differential (LVD), etc. 
   SCSI Extender       An SCSI extender is a device (a standalone module or card) used to extend the distance at which peripheral devices may be placed from the host computer.  The extender may use
  • Standard SCSI Cables for parallel SCSI
  • Coaxial cable for serial SCSI transmission, or
  • Fiber optic cable for high-speed, long-distance serial transmission
Note: In SCSI-3 it is called an "expander" instead of an extender. 
   SCSI Switch       Switches are used in industrial systems to connect test points or devices to instruments for the purpose of testing, measuring or monitoring the system. 
   Other       Other unlisted, specialized, or proprietary SCSI configurations. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
Back to Top
SCSI Standards
   SCSI Standards      See tables at the end of this help file for definitions of several features of SCSI standards.
   Your choices are...         
   SCSI-1       SCSI-1, the original SCSI, was standardized by ANSI in 1986.  It allows asynchronous data transfer rates of 1.5 MB/sec and synchronous transfer rates to a maximum of 5 MB/sec. It has an 8-bit SCSI port that uses Single-ended open-collector drivers. Uses a 50-pin connector. SCSI-1 is an obsolete standard after the development of SCSI-2. 
   Wide SCSI       This term is generally applied to Wide (16-bit) SCSI with a fast data transfer rate of up to 10 MBps. 
   Fast SCSI       Standard defined in SCSI-2.  Increases the maximum data rate from 5 MBps for Narrow (8-bit) SCSI to 10 MBps. 
   Wide Fast SCSI       This term is generally applied to Wide (16-bit) SCSI with a fast data transfer rate of up to 20 MBps. 
   Ultra SCSI       This is also known as Fast-20. It doubles the FAST SCSI data rate to up to 20 MBps for the 8-bit bus 
   Wide Ultra SCSI       Wide Ultra SCSI defines a maximum transfer data rate up to 40 MBps for the Wide (16-bit) SCSI. 
   SCSI-2       SCSI-2 has significant improvements over SCSI-1 including faster data transfer rates, better connectors, wider bus path, better reliability via synchronous negotiation and parity checking. SCSI-2 has a data transfer rate from 5 MB/sec to 10 MB/sec. This speed change is called Fast SCSI-2. Also, SCSI-2 provides the option to double the bus from 8 bits to 16 bits. This change is known as Wide SCSI. By combining the Fast SCSI-2 with the Wide SCSI bus a maximum data rate of 20 MB/sec can be achieved. 
   Ultra2 SCSI       This is also known as Fast-40.  It doubles the Ultra SCSI data rate to up to 40 MBps for the 8-bit bus. 
   Wide Ultra2 SCSI       Wide Ultra2 SCSI defines a maximum data rate of 80 MBps for the Wide (16-bit) SCSI.   
   SCSI-3       The SCSI-3 specification allows for faster transfer rate, more devices on a single chain (a maximum of 32), and also 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 (Ultra160)       This is also known as Fast-80 or Ultra-160. It doubles the Ultra2 SCSI data rate to up to 160 MBps for the 16-bit bus. 
   Ultra320 SCSI       Defines a maximum data rate of 320 MBps for the Wide (16-bit) SCSI. 
   Ultra640 SCSI       Defines a maximum data rate of 640 MBps for the Wide (16-bit) SCSI. 
   Fibre Channel       A high-speed serial protocol for channels and networks that uses links of twisted-pair, coaxial cable or fiber optic cable. SCSI can use the Fibre Channel Arbitrary Loop (FC-AL) topology. 
   Serial SCSI (FireWire®)       A very fast bus standard that supports data transfer rates of up to 400 Mbps. FireWire is a registered trademark of Apple Computers, Inc.  The standards are defined in IEEE 1394. 
   Other       Other unlisted, specialized, or proprietary SCSI standards. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Tables:         
   Bus Width      

Bus Width

Width      

Definition

Narrow

Narrow SCSI is the conventional SCSI specified in the original SCSI. The bus width is 8 bits.

Wide

Uses a data bus that is 16 bits wide. This doubling of the bus width respect to the Narrow SCSI comes at a higher cost, and it requires additional cabling and connectors.

         

 
   SCSI Type      

SCSI Type

Type      

Definition

SCSI-1

SCSI-1, the original SCSI, was standardized by ANSI in 1986. Allows asynchronous data transfer rates of 1.5 MB/sec and synchronous transfer rates to a maximum of 5 MB/sec. It has an 8-bit SCSI port that uses Single-ended open-collector drivers. Uses a 50-pin connector. SCSI-1 is an obsolete standard after the development of SCSI-2.

SCSI-2

SCSI-2 has significant improvements over SCSI-1 including faster data transfer rates, better connectors, wider bus path, better reliability via synchronous negotiation and parity checking. SCSI-2 has a data transfer rate from 5 MB/sec to 10 Mb/sec. This speed change is called Fast SCSI-2. Also, SCSI-2 provides the option to double the bus from 8 bits to 16 bits. This change is known as Wide SCSI. By combining the Fast SCSI-2 with the Wide SCSI bus a maximum data rate of 20 MB/sec can be achieved.

SCSI-3

The SCSI-3 specification allows for faster transfer rate, more devices on a single chain (a maximum of 32), and also 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.

          

 
   Bus Speed      

Bus Speed

Speed         

Definition

Regular

This is the default speed of the original specifications of SCSI-1. The regular bus speed is 5 MHz.

Fast

Fast SCSI increases the bus speed to 10 MHz. This doubling of the bus speed was defined in SCSI-2.

Ultra

Also known as Fast-20, it is specified in SCSI-3. The bus speed of Ultra SCSI is 20 MHz. Ultra SCSI buses have a maximum transfer rate of 20 MB/sec for Narrow SCSI, and 40 MB/sec for Wide SCSI.

    

 
   SCSI Standards     

SCSI Standards

 

 

 

Maximum Bus Lengths (meters)

Max Devices Supported

Protocol    

Max Speed (MBps)

Bus Width  (bits)

Single-ended

LVD  

HVD  

 

SCCI-1

5

8

6

--

--

8

Fast SCSI

10

8

3

--

25

8

Fast Wide SCSI

20

16

3

--

25

16

Ultra SCSI

20

8

1.5

--

25

8

Wide Ultra SCSI

40

16

3

--

--

8

Ultra2 SCSI

40

8

--

12

25

8

Wide Ultra2 SCSI

80

16

--

12

25

16

Ultra3 SCSI (Ultra 160)

160

16

--

12

--

16

Ultra 320

320

16

--

12

--

16

       

Back to Top
Product Form Factor
   Product Form Factor      The size, shape, and functional type of the SCSI product.
   Your choices are...         
   Stand-alone Unit       An independent unit connected to a system. 
   Board-level Unit       A computer board that is to be inserted in a carrier. 
   ASIC       Application Specific Integrated Circuit (ASIC) is a chip designed for a particular application. ASICs are manufactured by connecting existing circuits in new ways. 
   Rack Mount       A unit that can be mounted in a rack together with other units. 
   Other       Other unlisted, specialized, or proprietary configurations. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
Back to Top
Signaling Type and Level
   Single-ended SCSI (SE)?       Each signal is carried in only one wire while the other wire is grounded. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Multimode (LVD / MSE)?       The SCSI signal can be configured to be Low Voltage Differential (LVD) or Single-ended (SE). 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Differential SCSI:      In differential SCSI the signal transmitted is the voltage difference between the two lines of the cable.  Single-ended SCSI drives one signal line against ground.
   Your choices are...         
   HVD       SCSI signals are represented by 5 volts (TTL). 
   LVD       Uses 3.3 volts to represent the SCSI signals. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
Back to Top