Paralan SQ

SCSI Quiet Cable is designed to give maximum performance in all single-ended and differential (HVD and LVD) Slow, Fast, Ultra, Ultra2, Ultra3 and Ultra4 SCSI applications.

For reliable system performance, SCSI cable must meet ANSI specifications, which define both electrical and physical parameters. An example is cable pair position within the cable, with signal pairs around the outside and control pairs in the center.

Using Paralan's SCSI Quiet Cable virtually eliminates cables as a problem in getting a SCSI subsystem running reliably and at full data throughput.All cables meet the ANSI X3T10 standards, and are CE and FCC Class A tested.

 Each Paralan SCSI Quiet Cable consists of a shielded cable with 25 (or 34 for wide SCSI) twisted pairs of conductors and two connectors which may be SCSI-1, SCSI-2, SCSI-3, or a combination. The shield is electrically connected to the metal shell of each connector and is isolated from all other signal wires and the connector pins.

Cable pair impedance is maintained at 123 ohms, closely matching SCSI termination and thus reducing the potential for reflections. The cabling used for Paralan SCSI Quiet Cable is a high grade UL and CSA-approved, shielded cable consisting of 25 or 34 twisted pairs of multistranded 28 gauge flexible copper wire. Signals are placed within the cable at specified locations to improve noise immunity and to decrease signal crosstalk. 

Specifications For SCSI Quiet Cable :

Ordering Guide Paralan SCSI Quiet Cable ,for Single-ended and Differential (HVD and LVD) SCSI-1, -2 and -3 SCSI Applications.

Ordering Guide for CABLES IN FEET(To order SCSI Quiet Cables in meters, see metric ordering guide below)

Model No.	SQ____	_____	_____
Connector Type (male):	|	|	|
SCSI-1 (Alt. 2 - A Cable) - Centronics type	0	0	|
DB 50 (non-SCSI standard)	1	1	|
SCSI-2 (Alt. 1 - A Cable) - 50-pin High Density	2	2	|
SCSI-3 (Alt. 3 - P Cable) - 68-pin High Density	9	9	|
SCSI-2 Right Angle (50-pin High-Density, latch fasteners, cable exit pin 1 end)	J	J	|
SCSI-2 Right Angle (50-pin High-Density, latch fasteners, cable exit pin 50 end)	K	K	|
SCSI-3 Right Angle (68-pin High-Density, Jackscrew fasteners, cable exit pin 1 end)	N	N	|
SCSI-3 Right Angle (68-pin High-Density, Jackscrew fasteners, cable exit pin 68 end)	P	P	|
VHDCI (68-pin very High-Density, Jackscrew fasteners, cable exit offset)	V	V	|
Connector#1----------------------------	----|	|	|
Connector#2------------------------------	-----------	---|	|
Length in Feet ------------------------------------------	-----------	---------	001-160

• Example: Part No. SQ02 - 015: Paralan SCSI Quiet Cable with SCSI-1 (Alt. 2-A, centronics type) connector on one end and SCSI-2 50-pin High Density (Alt. 1 - A) connector on the other, 15 feet long.

Ordering Guide for CABLES IN METERS

Model No.	SQ___	_____-	M____
Connector Type (male):	|	|	|
SCSI-1 (Alt. 2 - A Cable) - Centronics type	0	0	|
DB 50 (non-SCSI standard)	1	1	|
SCSI-2 (Alt. 1 - A Cable) - 50-pin High Density	2	2	|
SCSI-3 (Alt. 3 - P Cable) - 68-pin High Density	9	9	|
SCSI-2 Right Angle (50-pin High-Density, latch fasteners, cable exit pin 1 end)	J	J	|
SCSI-2 Right Angle (50-pin High-Density, latch fasteners, cable exit pin 50 end)	K	K	|
SCSI-3 Right Angle (68-pin High-Density, Jackscrew fasteners, cable exit pin 1 end)	N	N	|
SCSI-3 Right Angle (68-pin High-Density, Jackscrew fasteners, cable exit pin 68 end)	P	P	|
VHDCI (68-pin very High-Density, Jackscrew fasteners, cable exit offset)	V	V	|
Connector #1------------------------------	----|	|	|
Connector#2-------------------------------	---------	----|	|
Length in Meters--------------------------------------------	---------	---------	0.5-50

• Example: Part No. SQ09 - M12: Paralan SCSI Quiet Cable with SCSI-1 (Alt. 2 - A cable) connector on one end and SCSI-3 (Alt. 3 - P cable) connector on the other, 12 m long.

SCSI BUS CONNECTORS

Description	Connector	Paralan "Quiet Cable"Option No.
This 50-contact, centronics-type, ribbon contact connector is used for Slow, Fast or Ultra, 8-bit Narrow SCSI applications. Frequently called the "SCSI-1 Connector". The SCSI spec terms it the "Alternative 2, A-cable connector".		0
This DB-50 pin-and-socket connector is not recognized by the SCSI specifications. Used on older Sun and DG computers for 8-bit Narrow SCSI applications.		1
Known as the 50-pin high-density SCSI connector. This pin-and-socket connector is also called the "SCSI-2 Connector". The SCSI recognized version has "latch" type fasteners. Used for 8-bit Narrow SCSI devices. The SCSI spec terms it the "Alt 1, A-cable connector".		2
This pin-and-socket DB25 connector was used on Apple computers, devices directed at the Apple market and some older Sun workstations. Not recognized by the SCSI specs. SCSI systems with this connector must be limited to Slow data rates and be no more than 4 or 5 feet long.		3
Known as the 68-pin high-density SCSI connector. This pin-and-socket connector is also called the "SCSI-3 Connector". The SCSI recognized version has "thumbscrew" fasteners. A few SCSI devices have used the "latch" version. Used for 16-bit Wide SCSI devices. The SCSI spec terms it the "Alt 3, P-cable connector".		9
This 68-contact, ribbon type connector is known as the "VHDCI" SCSI connector. Its very small size allows fitting up to 4 of them on the mounting bracket on the back of a PCI or ISA bus card. The SCSI spec terms it the "Alt 4, P-cable connector".		V
All drawings are views of the female connector -- the one that is normally mounted on the SCSI device. These drawings are not to scale, but their relative sizes are approximately correct.
RIGHT ANGLE CONNECTOR HOUSINGS
50-pin High-Density Right Angle Connector (male) with Latch Fasteners		J(Cable exit pin 1 end)K(Cable exit pin 50 end)
68-pin High-Density Right Angle Connector (male) with Jackscrew Fasteners		N(Cable exit pin 1 end)P(Cable exit pin 68 end)