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SCSI Information

  • 26-11-2009, 13:32
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SCSI Information

Background

It all started back in 1979 when the diskdrive manufacturer come with the bright idea to make a new transfer protocol. The protocol was named Shugart Associates Systems Interface, SASI. This protocol wasn"t an ANSI standard, so NCR join Shugart and the ANSI committee X3T9.2 was formed. The new name for the protocol was, Small Computer Systems Interface, SCSI.

Common Command Set, CCS, was added in 1985. ANSI finished the SCSI standard in 1986. SCSI-II devices was released in 1988 and was an official standard in 1994. SCSI-III is currently not yet official.

Usage

SCSI is used to connect peripherals to an computer. It allows you to connect harddisks, tape devices, CD-ROMs, CD-R units, DVD, scanners, printers and many other devices. SCSI is in opposite to IDE/ATA very flexible. Today SCSI is most often used servers and other computers which require very good performance. IDE/ATA is more popular due to the fact that IDE/ATA devices tend to be cheaper.

Definitions

SCSI

Short for Small Computer Systems Interface. The original SCSI protocol. ANSI standard X3.131-1996. Busspeed 5 MHz. Datawidth 8 bits.

SCSI-II

SCSI-II adds support for CD-ROM"s, scanners and tapedrives.

Fast SCSI-II

Uses the busspeed of 10MHz instead of the original 5MHz.

Wide SCSI-II

Uses 16 bits instead of the original 8 bits.

Ultra SCSI-III

Uses the busspeed of 20MHz.

 
Network Information

Networking standards

10Base-T (Standard Ethernet)

    Speed: 10 Mbhttp://www.bdn.odessa.ua/HWB/li> Connectors: RJ45 Cables: Twisted Pair (category 3) Wiring scheme: EIA/TIA 568B Maximum cable length: 100 m Star Topology

100Base-T (Fast Ethernet)

    Speed: 100 Mbhttp://www.bdn.odessa.ua/HWB/li> Connectors: RJ45 Cables: Twisted Pair (category 5) Wiring scheme: EIA/TIA 568B Maximum cable length: 100 m Star Topology

1000Base-T (Gigabit Ethernet)

    Speed: 1000 Mbhttp://www.bdn.odessa.ua/HWB/li> Connectors: RJ45 Cables: Twisted Pair (category 5 Enhanced) Wiring scheme: EIA/TIA 568B Maximum cable length: 100 m Star Topology

10Base-2 (Thin Ethernet)

    Speed: 10 Mbhttp://www.bdn.odessa.ua/HWB/li> Connectors: BNC Cables: RG58 (50 ohm) Maximum cable segment length: 185 m Maximum devices per cable segment: 30 Minimum distance between devices: 0.3 m? Bus Topology Terminators in each end: 50 ohm

10Base-5 (Thick Ethernet)

    Speed: 10 Mbhttp://www.bdn.odessa.ua/HWB/li> Connectors: N-Type Cables: RG8 Wiring scheme: EIA/TIA 568B Maximum cable length: 500 m Maximum devices per cable segment: 100 Minimum distance between devices: 2.5 m Bus Topology Terminators in each end: 50 ohm

TokenRing

    Speed: 4 or 16 Mbhttp://www.bdn.odessa.ua/HWB/li> Connectors: RJ45 or IBM Data Connector Cables: Twisted Pair (category 3) Maximum ring length: 168m at 16Mbit/s, 360 m at 4Mbit/s Maximum cable length: Depends on ring length and network layout Maximum devices per network: 72 (UTP) or 250-260 (Type1) Token based ring Topology (physical star, logical ring)

Cabeling

Twisted Pair

Category type Bandwidth Typical speed
Category 3 16 MHz 16 Mbhttp://www.bdn.odessa.ua/HWB/td>
Category 4 20 MHz 20 Mbhttp://www.bdn.odessa.ua/HWB/td>
Category 5 125 MHz 100 Mbhttp://www.bdn.odessa.ua/HWB/td>
Category 5 Enhanced 125 MHz 100 Mbit/s (1000Mbit/s with 1000BaseT)

 

 

SmallPCI (SPCI)

PCI=Peripheral Component Interconnect.
SmallPCI is a a version of PCI adapted for small computers and PDAs.

UNKNOWN (At the motherboard)
UNKNOWN (At the device)

UNKNOWN CONNECTOR at the motherboard.
UNKNOWN CONNECTOR at the device.

 
 
 
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