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98 Cards in this Set

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SCSI = ______
Small Computer System Interface
What company introduced SCSI?
Shugart Systems
When was SCSI first introduced by Shugart Systems?
1979
The ___ ____ is the controller card device that attaches the SCSI chain to the PC's expansion bus.
Host Adapter
How many connections are on the "host adapter" and what are they used for?
2 connection

For external SCSI devices & Internal SCSI drives
What are the 2 important SCSI configurations that must be done for a successful installation?
1 Proper & Unique SCSI ID#

2 Proper device termination
What SCSI ID#s are used in the early versions & used in later versions?
0-7

0-15
What sets the priority of the SCSI IDs at 0 for the highest, and the 1,2 etc.?
The SCSI standard
Devices with a _____ priority run _____ than the devices with ____ priority.
high
faster
low
When is it possible for 2 or more SCSI devices to share the same SCSI ID#?
Never
What is the rule for assignment of the SCSI ID#s?
None, it doesn't matter
A SCSI device can have any SCSI ID as long as no 2 devices on a single host adapter share the same one. (T/F)
True
Most host adapter manufacturers set their devices to use SCSI ID _, _, OR __.
0
7
15
How do you typically set a SCSI ID for a particular device?
By setting the jumpers on it, but some have DIP switches, rotary wheels or software.
What is the other term for SCSI ID?
SCSI Address
Not all SCSI devices are designed to use every possible SCSI ID. (T/F)
True
What are usually the only 2 possible SCSI IDs that you can assign to a Zip Drive?
ID 5

ID 6
SCSI IDs are set at the controller. (T/F)
False, they are always set at device level, not the controller.
How do you terminate a daisy chain?
Put a device (a terminator) on each end of the chain to prevent data signal from echoing back up the wire.
SCSI terminators are either _____ or _____. What is the difference between the 2?
Active, Passive

Active have built in Voltage regulators.
What are the rules for proper SCSI termination?
You MUST terminate both ends of the SCSI chain.
If your SCSI chain isn't properly terminated will they work?
No
Most SCSI devices have built in terminators which can be configured with ______ or ______.
Jumpers

Switches
If the SCSI does NOT have a built in terminator what must be done?
It must be terminated with an add-on resistor component that snaps onto the end of the chain.
Be careful when terminating a SCSI device, why?
Improper termination can in some cases damage or destroy SCSI hardware.
What are all the SCSI standards collectively referred to?
SCSI types or SCSI flavors
To date, how many SCSI types have been recognized?
3
The SCSI-1 standard defined an _ bit, _ MHz bus capable of supporting up to _ SCSI devices.
(SCSI-1)
8 bit
5 MHz
8 devices
In what year did SCSI begin appearing on IBM-compatible PC machines?
1986
SCSI-1 transferred data through a ______ path only _ bits wide.
parallel

8
CCS = ___ ____ ____
Common Command Set
How many commands made up the SCSI CCS?
18
The CCS for SCSI-2 introduced new commands for addressing devices other than hard drives. (T/F)
True, it included CD-ROM drives, tape drives, and scanners.
SCSI-2 incorporated a new feature called _______ ______ which enabled a SCSI device to accept multiple commands at once.
command queuing
Before SCSI-2 no true standard existed for SCSI connectors. (T/F)
True
The new SCSI-2 connector standard did what?
It ensured that any 2 SCSI-2 compliant devices could be physically connected.
SCSI-2 defined 2 optional buses, what were they?
16-bit
32-bit (aka "Wide SCSI")
and a 10MHz speed called "Fast SCSI"
What was aka "Narrow SCSI?"
The SCSI-2 8 bit
What was aka "Wide SCSI?"
The SCSI-2 16 bit (or 32 bit)
What was aka the slow & fast standard for SCSI-2?
SLOW = 5 MHz

FAST = 10 MHZ
ACK = _____

REQ = _____
Acknoledge

Request
SCSI-2 transfers data in fast synchronous mode, meaning the...
SCSI device being talked to (the target) doesn't have to acknowledge every request for data from the host (initiator)
When SCSI-2 devices use "fast synchronous" mode this _____ the transfer speed from _-__ Mbps for narrow & __-__Mbps for wide.
doubles
5-10
10-20
SE = _____ ______
Single Ended
SE SCSI devices communicated each bit of information through how many wires?
Only 1
A big problem with SE SCSI was line noise, called ____-____ _____.
common mode noise
The amount of common mode noise grows with the length of the SCSI cable, limiting the SE SCSI chain to __ meters
6
HVD = ____ ____ ____
High Voltage Differential
HVD SCSI is formerly known as _____ ____.
Differential SCSI
HVD uses how many wires per bit of data & what are they used for?
2 wires, 1 for the data & 1 for the inverse of the data to measure the difference to filter noise
HVD SCSI extends the SCSI chains up to __ meters.
25
How should you connect HVD & SE devices on the same chain?
NEVER connect SE & HVD on the same chain, you can/will fry both devices.
Name the 2 types of differential SCSI?
HVD

LVD
LVD = _____ ____ ____
Low Voltage Differential
What are some advantages to LVD SCSI devices?
It uses less power than HVD & is compatible with SE SCSI controllers & devices, it also adapts to SE or LVD.
What is the length of the LVD SCSI chain?
12 meters
What are some other names for SCSI-3?
Ultra2

Wide Ultra
Wide SCSI can hold up to __ devices on one chain. Each device gets a # from _ to __ instead of 0-7.
16

0-15
What are 2 terms used to describe a 20 MHz bus speed version of SCSI?
Ultra

Fast-20
Ultra2 & Fast-40 describe a __ MHz bus speed.
40
What 2 terms are used to define an 80 MHz bus speed of SCSI?
Ultra3

Fast-80
The terms "narrow" & "wide" refer to how many bits (in terms of SCSI).
Narrow = 8 bits

Wide = 16 Bits
Give the 8 & 16 bit speeds
Ultra (Fast20)
Ultra2 (Fast40)
Ultra3 (Fast80)
20 Mbps 40 Mbps
40 Mbps 80 Mbps
80 Mbps 160 Mbps
Are any versions of SCSI hot swappable?
Yes, SCSI-3
What is the latest version of SCSI and what is its speed?
Ultra320, it doubles the clock speed from 160 Mbps to 320 Mbps.
Ultra320 is dubbed _______.
Packetsized
Ultra320 can it allow transfer of multiple commands or data from multiple I/O processes.
Yes, and in a Single connection
What type of error checking does Ultra320 offer?
CRC
CRC = _____ _____ _____
Cyclical redundancy checking
Ultra320 is not backward compatible. (T/F)
False, it is backward compatible with earlier SCSI versions.
Most normal versions of SCSI transmit data how?
Parallel streams
What is the industry's response to Serial ATA?
Serial-Attached SCSI (SAS)
Details are not exact, but the possible throughput speed of SAS is ___.
1.5 GBps
If you have 1 Internal SCSI device, & 1 External SCSI device, the controller is where, & what is terminated?
The controller is in the middle & you terminate the 2 devices. Never terminate the controller.
What type of cable do the Internal & External SCSI devices use?
Internal = Ribbon Cable

External = thick insulated (like a printer cable)
Most external SCSI devices have _ ports and a 3rd connection for what?
2 ports

Independant power supply
What are the 2 ports on an External SCSI device for?
Input

Output, for daisy chaining
What is the official flavor/type of SCSI cable/connector that should be used?
There is not an official version of either cable/connector
What is the most common kind of SCSI cable?
Type A which has 50 wires for 8-bit data transfers for both SCSI-1 & SCSI-2 & 8 bit Fast SCSI-2
Describe the Type B SCSI cable.
68 wires, used in parallel with the 50 wire type A, was replaced by the Type P wire
Describe the Type P cable.
68 Wires & transfered data at 16-bits, and unlike type B, it can be used alone.
Some of the higher end SCSI-3 host adapters & drives use an __-pin cable called ___ __.
80 Pin, SCA 80
The extra wires on the SCA 80 allowed what?
Hot-swappablility
All External connectors on SCSI devices are _____.
Female
50-Pin Centronics cable was used for what version of SCSI?
obsolete SCSI-1 connector
50-pin HD (high density)cable was used for what version of SCSI?
SCSI-2 cable
68-Pin HD DB cable was used for what version of SCSI?
SCSI-2, SCSI-3
25-Pin standard D (looks like a parallel connector) was used for what version of SCSI?
SCSI-2, for Macintosh systems and removable drives
Which versions of Windows will recognize most SCSI devices?
All versions of Windows come with the drivers
What is the big name is host-adapters?
Adaptec
When installing host-adapters, make sure that it is compatible how?
Narrow or wide or both, whichever your system is, the host adapter needs to be able to support it
Only terminate the host adapter when it is the END of the chain, never in the middle. (T/F)
True
How do you check a newly installed SCSI device/host in Windows for proper installation?
Check Windows Device Manager for recognition/functionality without conflicts.
How will you know when you get a SCSI address or termination conflict on your system after installation?
It won't be visible to your system.
If your system doesn't see your SCSI components, run a what?
SCSI chain scanning utility
If you didn't terminate your SCSI chain properly, the scan will show what?
It won't show any devices on the chain.
If your SCSI scanning utility only shows a few devices, you probably did what?
Put a terminator somewhere other than the end of the chain.
If you have assigned the same SCSI ID to more than one device, the scanning utility will show what?
It will show only 1 device but that it has cloned itself.