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Catskill Supply, Inc.
TELEPHONE:
  (888) 475-5044 - Phone

CUSTOMER SERVICE:
Monday to Friday
9 - 4 (EST)
SCSI I
DB-25 Male
SCSI I
DB-25 Female
SCSI I
CENTRONICS 50 Male
SCSI I
CENTRONICS 50 Female
SCSI I - DB-25 Male SCSI 1- DB-25 Female SCSI 1 - CENTRONICS 50 Male SCSI 1 - CENTRONICS 50 Female
SCSI II
HP-50 Male
SCSI II
HP50 Female
SCSI II
IDC 50 Male
SCSI II
IDC 50 Female
SCSI 2 - HP-50 Male SCSI 2 - HP-50 Female SCSI 2- IDC 50 Male SCSI 2 - IDC 50 Female
SCSI III
HP-68 Male
SCSI III
HP68 Female
SCSI III
SCA 80 Male
SCSI III
SCA 80 Female
SCSI 3 - HP-68 Male SCSI 3 - HP-68 Female SCSI 3 - SCA-80 Male SCSI 3 - SCA-80 Female
SCSI Terminology and Definitions

SCSI: Small Computer System Interface. Primarily used in business systems. Capable of handling many devices, where IDE can only handle a few items.

Narrow SCSI: Usually refers to SCSI I or SCSI II devices where a 25 or 50-pin connector is used. 5 MB/sec transfer rate. 7 devices. Maximum cable length is 20 feet. 8 bit bus width. 5 Mhz bus speed.

Fast SCSI: Usually refers to SCSI II devices where a 68-pin connector is used. 10 MB/sec transfer rate. 7 devices. Maximum cable length is 10 feet. 8 bit bus width. 10 Mhz bus speed.

Wide SCSI: Usually refers to SCSI II devices where a 68-pin connector is used. 10 MB/sec transfer rate. 15 devices. Maximum cable length is 20 feet. 16 bit bus width. 5 Mhz bus speed.

Fast & Wide SCSI: Usually refers to SCSI II devices where a 68-pin connector is used. 20 MB/sec transfer rate. 15 devices. Maximum cable length is 10 feet. 16 bit bus width. 10 Mhz bus speed.

Ultra SCSI: Usually refers to SCSI III devices where a 68-pin connector is used. 20 MB/sec transfer rate. 7 devices. Maximum cable length is 5-10 feet. 8 bit bus width. 20 Mhz bus speed.

Ultra Wide SCSI: Usually refers to SCSI III devices where a 68-pin connector is used. 40 MB/sec transfer rate. 15 devices. Maximum cable length is 5-10 feet. 16 bit bus width. 40 Mhz bus speed.

Ultra 160 SCSI: Usually refers to SCSI III devices where a 68-pin connector is used. 160 MB/sec transfer rate. 15 devices. Maximum cable length is 35 feet. 32 bit bus width. 80 Mhz bus speed.

Ultra 320 SCSI: Usually refers to SCSI III devices where a 68-pin connector is used. 320 MB/sec transfer rate. 15 devices. Maximum cable length is 35 feet. 32 bit bus width. 80 Mhz bus speed.

Ultra2 Wide SCSI LVD: Usually refers to SCSI III devices where a 68-pin connector is used. 80 MB/sec transfer rate. 15 devices. Maximum cable length is 35 feet. 32 bit bus width. 80 Mhz bus speed.

Serial SCSI (Firewire): Standard created by Apple Computer. 25-40 MB/sec transfer rate. 63 devices. 100-4000 Mhz bus speed. Need IEEE 1394 6-pin Firewire cable.

Differential SCSI: Also called HVD (High Voltage Differential) as opposed to LVD. Specifically designed to reduce the signal lose of the data trasmission. Enable you to have longer cable lengths. It is more expensive and not very common. Used by some IBM RS/6000 machines.

Passive Terminator: Terminates the end of a physical SCSI wire. Passive is cheaper, and should only be used with shorter cables. When in doubt, use Active Terminators.

Active Terminator: Terminates the end of a physical SCSI wire. Active is more expensive, and better then passive. Can be used with longer SCSI cables. Our opinion is that for a couple extra dollars, you might avoid costly down time and debugging. Well worth the money.

LVD: Low Voltage Differential. Ability to run up to 12 meters or 35 feet. Used on Ultra SCSI controllers. Make SURE that you use a good Active Terminator. Do NOT allow the device to terminate the cable.

SCA: Single Connector Attachment. Used for many of the HOT-Plugable devices. 80 pin connector for SCSI III devices. The extra 12 wires are for power. The device usually has it's own power.

RAID: Redundant Array of Independent Disk. A RAID allows a user to take a number of disk drives and make them one logical device. RAID 0 is for striping data across a number of drives. RAID 1 is for Mirroring disk drives for safety. RAID 5 is used for safety, speed, and drive failure. If an independent drive fails one "extra" drive will take over after the RAID controller moves all the data off the failing drive, while the system keeps on running as if nothing happen.

LUN: Logical Unit Number. Used for Fractionalizing a SCSI ID Number. The most commonly used LUN is for multiple CD-ROM's off one SCSI ID number. Sometimes referred to as a Jukebox.



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Catskill Supply, Inc.
Box 421
Selkirk, NY 12158

(888) 475-5044 - OFFICE

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