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98 Cards in this Set
- Front
- Back
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SCSI = ______
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Small Computer System Interface
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What company introduced SCSI?
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Shugart Systems
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When was SCSI first introduced by Shugart Systems?
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1979
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The ___ ____ is the controller card device that attaches the SCSI chain to the PC's expansion bus.
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Host Adapter
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How many connections are on the "host adapter" and what are they used for?
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2 connection
For external SCSI devices & Internal SCSI drives |
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What are the 2 important SCSI configurations that must be done for a successful installation?
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1 Proper & Unique SCSI ID#
2 Proper device termination |
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What SCSI ID#s are used in the early versions & used in later versions?
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0-7
0-15 |
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What sets the priority of the SCSI IDs at 0 for the highest, and the 1,2 etc.?
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The SCSI standard
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Devices with a _____ priority run _____ than the devices with ____ priority.
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high
faster low |
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When is it possible for 2 or more SCSI devices to share the same SCSI ID#?
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Never
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What is the rule for assignment of the SCSI ID#s?
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None, it doesn't matter
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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)
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True
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Most host adapter manufacturers set their devices to use SCSI ID _, _, OR __.
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0
7 15 |
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How do you typically set a SCSI ID for a particular device?
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By setting the jumpers on it, but some have DIP switches, rotary wheels or software.
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What is the other term for SCSI ID?
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SCSI Address
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Not all SCSI devices are designed to use every possible SCSI ID. (T/F)
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True
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What are usually the only 2 possible SCSI IDs that you can assign to a Zip Drive?
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ID 5
ID 6 |
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SCSI IDs are set at the controller. (T/F)
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False, they are always set at device level, not the controller.
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How do you terminate a daisy chain?
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Put a device (a terminator) on each end of the chain to prevent data signal from echoing back up the wire.
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SCSI terminators are either _____ or _____. What is the difference between the 2?
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Active, Passive
Active have built in Voltage regulators. |
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What are the rules for proper SCSI termination?
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You MUST terminate both ends of the SCSI chain.
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If your SCSI chain isn't properly terminated will they work?
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No
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Most SCSI devices have built in terminators which can be configured with ______ or ______.
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Jumpers
Switches |
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If the SCSI does NOT have a built in terminator what must be done?
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It must be terminated with an add-on resistor component that snaps onto the end of the chain.
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Be careful when terminating a SCSI device, why?
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Improper termination can in some cases damage or destroy SCSI hardware.
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What are all the SCSI standards collectively referred to?
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SCSI types or SCSI flavors
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To date, how many SCSI types have been recognized?
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3
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The SCSI-1 standard defined an _ bit, _ MHz bus capable of supporting up to _ SCSI devices.
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(SCSI-1)
8 bit 5 MHz 8 devices |
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In what year did SCSI begin appearing on IBM-compatible PC machines?
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1986
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SCSI-1 transferred data through a ______ path only _ bits wide.
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parallel
8 |
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CCS = ___ ____ ____
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Common Command Set
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How many commands made up the SCSI CCS?
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18
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The CCS for SCSI-2 introduced new commands for addressing devices other than hard drives. (T/F)
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True, it included CD-ROM drives, tape drives, and scanners.
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SCSI-2 incorporated a new feature called _______ ______ which enabled a SCSI device to accept multiple commands at once.
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command queuing
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Before SCSI-2 no true standard existed for SCSI connectors. (T/F)
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True
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The new SCSI-2 connector standard did what?
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It ensured that any 2 SCSI-2 compliant devices could be physically connected.
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SCSI-2 defined 2 optional buses, what were they?
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16-bit
32-bit (aka "Wide SCSI") and a 10MHz speed called "Fast SCSI" |
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What was aka "Narrow SCSI?"
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The SCSI-2 8 bit
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What was aka "Wide SCSI?"
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The SCSI-2 16 bit (or 32 bit)
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What was aka the slow & fast standard for SCSI-2?
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SLOW = 5 MHz
FAST = 10 MHZ |
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ACK = _____
REQ = _____ |
Acknoledge
Request |
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SCSI-2 transfers data in fast synchronous mode, meaning the...
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SCSI device being talked to (the target) doesn't have to acknowledge every request for data from the host (initiator)
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When SCSI-2 devices use "fast synchronous" mode this _____ the transfer speed from _-__ Mbps for narrow & __-__Mbps for wide.
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doubles
5-10 10-20 |
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SE = _____ ______
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Single Ended
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SE SCSI devices communicated each bit of information through how many wires?
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Only 1
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A big problem with SE SCSI was line noise, called ____-____ _____.
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common mode noise
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The amount of common mode noise grows with the length of the SCSI cable, limiting the SE SCSI chain to __ meters
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6
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HVD = ____ ____ ____
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High Voltage Differential
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HVD SCSI is formerly known as _____ ____.
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Differential SCSI
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HVD uses how many wires per bit of data & what are they used for?
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2 wires, 1 for the data & 1 for the inverse of the data to measure the difference to filter noise
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HVD SCSI extends the SCSI chains up to __ meters.
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25
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How should you connect HVD & SE devices on the same chain?
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NEVER connect SE & HVD on the same chain, you can/will fry both devices.
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Name the 2 types of differential SCSI?
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HVD
LVD |
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LVD = _____ ____ ____
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Low Voltage Differential
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What are some advantages to LVD SCSI devices?
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It uses less power than HVD & is compatible with SE SCSI controllers & devices, it also adapts to SE or LVD.
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What is the length of the LVD SCSI chain?
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12 meters
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What are some other names for SCSI-3?
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Ultra2
Wide Ultra |
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Wide SCSI can hold up to __ devices on one chain. Each device gets a # from _ to __ instead of 0-7.
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16
0-15 |
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What are 2 terms used to describe a 20 MHz bus speed version of SCSI?
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Ultra
Fast-20 |
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Ultra2 & Fast-40 describe a __ MHz bus speed.
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40
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What 2 terms are used to define an 80 MHz bus speed of SCSI?
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Ultra3
Fast-80 |
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The terms "narrow" & "wide" refer to how many bits (in terms of SCSI).
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Narrow = 8 bits
Wide = 16 Bits |
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Give the 8 & 16 bit speeds
Ultra (Fast20) Ultra2 (Fast40) Ultra3 (Fast80) |
20 Mbps 40 Mbps
40 Mbps 80 Mbps 80 Mbps 160 Mbps |
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Are any versions of SCSI hot swappable?
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Yes, SCSI-3
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What is the latest version of SCSI and what is its speed?
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Ultra320, it doubles the clock speed from 160 Mbps to 320 Mbps.
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Ultra320 is dubbed _______.
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Packetsized
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Ultra320 can it allow transfer of multiple commands or data from multiple I/O processes.
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Yes, and in a Single connection
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What type of error checking does Ultra320 offer?
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CRC
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CRC = _____ _____ _____
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Cyclical redundancy checking
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Ultra320 is not backward compatible. (T/F)
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False, it is backward compatible with earlier SCSI versions.
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Most normal versions of SCSI transmit data how?
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Parallel streams
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What is the industry's response to Serial ATA?
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Serial-Attached SCSI (SAS)
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Details are not exact, but the possible throughput speed of SAS is ___.
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1.5 GBps
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If you have 1 Internal SCSI device, & 1 External SCSI device, the controller is where, & what is terminated?
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The controller is in the middle & you terminate the 2 devices. Never terminate the controller.
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What type of cable do the Internal & External SCSI devices use?
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Internal = Ribbon Cable
External = thick insulated (like a printer cable) |
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Most external SCSI devices have _ ports and a 3rd connection for what?
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2 ports
Independant power supply |
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What are the 2 ports on an External SCSI device for?
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Input
Output, for daisy chaining |
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What is the official flavor/type of SCSI cable/connector that should be used?
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There is not an official version of either cable/connector
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What is the most common kind of SCSI cable?
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Type A which has 50 wires for 8-bit data transfers for both SCSI-1 & SCSI-2 & 8 bit Fast SCSI-2
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Describe the Type B SCSI cable.
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68 wires, used in parallel with the 50 wire type A, was replaced by the Type P wire
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Describe the Type P cable.
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68 Wires & transfered data at 16-bits, and unlike type B, it can be used alone.
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Some of the higher end SCSI-3 host adapters & drives use an __-pin cable called ___ __.
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80 Pin, SCA 80
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The extra wires on the SCA 80 allowed what?
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Hot-swappablility
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All External connectors on SCSI devices are _____.
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Female
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50-Pin Centronics cable was used for what version of SCSI?
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obsolete SCSI-1 connector
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50-pin HD (high density)cable was used for what version of SCSI?
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SCSI-2 cable
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68-Pin HD DB cable was used for what version of SCSI?
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SCSI-2, SCSI-3
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25-Pin standard D (looks like a parallel connector) was used for what version of SCSI?
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SCSI-2, for Macintosh systems and removable drives
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Which versions of Windows will recognize most SCSI devices?
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All versions of Windows come with the drivers
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What is the big name is host-adapters?
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Adaptec
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When installing host-adapters, make sure that it is compatible how?
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Narrow or wide or both, whichever your system is, the host adapter needs to be able to support it
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Only terminate the host adapter when it is the END of the chain, never in the middle. (T/F)
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True
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How do you check a newly installed SCSI device/host in Windows for proper installation?
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Check Windows Device Manager for recognition/functionality without conflicts.
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How will you know when you get a SCSI address or termination conflict on your system after installation?
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It won't be visible to your system.
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If your system doesn't see your SCSI components, run a what?
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SCSI chain scanning utility
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If you didn't terminate your SCSI chain properly, the scan will show what?
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It won't show any devices on the chain.
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If your SCSI scanning utility only shows a few devices, you probably did what?
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Put a terminator somewhere other than the end of the chain.
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If you have assigned the same SCSI ID to more than one device, the scanning utility will show what?
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It will show only 1 device but that it has cloned itself.
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