Mentioned in
?
References in periodicals archive
?
There are three SCSI standards: SCSI-1, SCSI-2 and SCSI-3.
The American National Standards Institute (ANSI) ratified the first standard in 1986 calling it SCSI-1. SCSI-1 did not share a common standard which caused equipment incompatibilities.
SCSI-2 was a definitive enhancement over SCSI-1. SCSI-2 featured a wider data bus doubling in size from 8- to 16-bit supporting 16 devices.
Passive termination is rarely used today because it was designed for low-speed and short distance SCSI-1 devices.
Table 1: Maximum SCSI cable lengths STA TERM Max Bus Bus MAXIMUM BUS LENGTH Max Speed, Width, Number of Mbytes/Sec Bits SE HVD LVD SCSI IDs Slow SCSI (SCSI-1) 5 8 6m 25m -- 8 Fast SCSI (SCSI-2) 10 8 3m 25m -- 8 Fast Wide SCSI 20 16 3m 25m -- 16 Ultra SCSI (SCSI-3) 20 8 1.5m 25m -- 8 Ultra SCSI 20 8 3m 25m -- 4 Wide Ultra SCSI 40 16 1.5m 25m -- 16 Wide Ultra SCSI 40 16 3m 25m -- 4 Ultra2 SCSI 40 8 -- -- 12 * 8 Wide Ultra2 SCSI 80 16 -- -- 12 * 16 Ultra160 SCSI 160 16 -- -- 12 * 16 Ultra320 SCSI 320 16 -- -- 12 * 16
A single-ended SCSI-1 device can be connected through an expander to a high-performance LVD SCSI Ultra32O or Ultra64O SCSI bus.
Initial disks, which were capable of transferring data at 1MB/sec, were adequately supported by the initial 5MB/sec SCSI-1 interface.
Q: How do I properly terminate a chain that goes from SCSI-2 to SCSI-1? We have a new system with a dual-channel, on-board SCSI controller.
Where did half of the connectors go between the SCSI-2 and SCSI-1 connectors?
With today's Ultra2SCSI, disk arrays can be plug-and-play backward compatible all the way to SCSI-1 of 1984 and forward compatible to Ultra160/m and possibly beyond, which ensure investment protection well into the next five years.
The large 50 pin connector in SCSI-1 has shrunk to a 68 pin VHDCI connector and the data rates increased to 160MB/sec.
SCSI-1 is often lumped together with SCSI-2 as a basic starting level.
Encyclopedia browser
?
- ▲
- Scrum Sprint
- scrumpy
- scruple
- scrutiny
- Scrying
- SCS
- SCSA
- SCSI
- SCSI adaptor
- SCSI Architecture Model
- SCSI asynchronous mode
- SCSI chain
- SCSI connectors
- SCSI controller
- SCSI host adapter
- SCSI ID
- SCSI initiator
- SCSI interface
- SCSI protocol
- SCSI reconnect
- SCSI signaling
- SCSI switch
- SCSI synchronous mode
- SCSI target
- SCSI termination
- SCSI-1
- SCSI-2
- SCSI-3
- SCTP
- scuba
- scuba diving
- scud
- scud running
- Scudder, Janet
- Scudder, Samuel Hubbard
- Scudder, Vida
- Scudéry, Madeleine de
- Scudo
- scuffing
- scuffle
- scuffle hoe
- scull
- Scull, Robert C.
- scullery
- Scullin
- Scully, Vincent
- Scully, Vincent Joseph, Jr.
- sculpin
- Sculptor
- Sculptor Group
- Sculptor system
- ▼
Full browser
?
- ▲
- SCSI Peripheral Adapter
- SCSI Presented Data Transfer Length
- Scsi Primary Commands
- SCSI protocol
- SCSI protocol
- SCSI protocol
- SCSI protocol over TCP/IP
- Scsi Rdma Protocol
- SCSI reconnect
- SCSI Remote Protocol
- SCSI Request Block
- SCSI signaling
- SCSI signaling
- SCSI signaling
- Scsi Status Block
- Scsi Stream Command
- SCSI switch
- SCSI switch
- SCSI switch
- SCSI switch
- SCSI synchronous mode
- SCSI target
- Scsi Target Emulation
- SCSI termination
- SCSI termination
- SCSI termination
- SCSI termination
- SCSI termination
- Scsi to Scsi
- SCSI Trade Association
- SCSI-1
- SCSI-2
- SCSI-2
- SCSI-3
- SCSI-3 Architecture Model
- SCSIA
- SCSIB
- SCSIFS
- SCSIIT
- SCSIO
- SCSIS
- SCSIT
- SCSITA
- SCSJ
- SCSJA
- SCSJAC
- SCSK
- SCSKL
- SCSL
- SCSLC
- SCSLM
- SCSLSA
- SCSM
- SCSMA
- SCSMC
- SCSMCM
- SCSMEX
- SCSMI
- SCSML
- SCSMO
- SCSMT
- ▼