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36.TXT
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1993-08-31
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DOCUMENT:Q103436 26-AUG-1993 [W_NT]
TITLE :Small Computer System Interface (SCSI) Bus Configuration
PRODUCT :Windows NT
PROD/VER:3.10
OPER/SYS:WINDOWS
KEYWORDS:
--------------------------------------------------------------------
The information in this article applies to:
- Microsoft Windows NT operating system version 3.1
- Microsoft Windows NT Advanced Server version 3.1
--------------------------------------------------------------------
The following table describes the configuration attributes of the
standard SCSI interface.
Bit Cable Pin Max Transfer Max SCSI
Standard Width Name Cnt. Rate MB/sec Devices Description
-------------------------------------------------------------------
SCSI-1 8 A 50 5 8 Asynchronous
SCSI-2 8 A 50 10 8 fast
SCSI-2 16 A+B 50+68 20 8 fast+wide **
SCSI-2 32 A+B 50+68 40 8 fast+wide **
SCSI-3 8 A 50 10 8 fast
SCSI-3 16 P 68 20 16 fast+wide *
SCSI-3 32 P+Q 68+68 40 32 fast+wide **
* = with 1 cable
** = with 2 cables
Standard: The name of the SCSI standard as defined by ANSI.
Bit width: The number of bits that gets transferred by the SCSI
bus during the data transfer phases.
Cable Names: A is most common, P is getting more popular, A+B is
currently not popular due to cost and space issues.
Pin Count: The number of pins in the cable. Refer to the above table
for specific numbers.
Max Transfer Rate (MB/sec): Number of bits transferred over the
SCSI bus in one second.
Max SCSI Devices: The Maximum number of devices that can be
connected to the SCSI bus with one host adapter installed.
Description:
Asynchronous: A handshaking protocol that requires a
handshake for every byte transferred (Synchronous transfers a
series of bytes before handshaking occurs, which speeds data
transfer rate)
Fast: Fast SCSI is an option that doubles the synchronous data
transfer speed. The speed is achieved by removing excess margins
from certain times and delays. To use the fast SCSI option, high
quality cables are required. This option is compatible with normal
synchronous SCSI and has:
- Up to 10 (megabytes) MB/second over an 8 bit bus.
- Synchronous Data transfer negotiation required.
- Single-ended implementation recommendations: max cable length of
3 meters and active terminators.
Wide: Wide SCSI is an option that adds a second SCSI cable of 68
conductors. This cable provides a data path for 16- or 32-bit data.
This path has separate handshake signals and is for data transfer
only. The transfer rate is two or four times the present transfer
rate of SCSI-1. With the second cable, SCSI-2 remains compatible
with the 8-bit SCSI.
Additional reference words: 3.10 specification summary port connection
daisy chain address
KBCategory:
KBSubCategory: winnt
=============================================================================
THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.
Copyright Microsoft Corporation 1993.