Paralan ST123 SCSI Cable Tester

• Tests all SCSI Cable Types
• Continuity Test
• Twisted Pair Test
• Easy as 1-2-3

Continuity tests alone are not sufficient to qualify SCSI cable assemblies. Proper testing of SCSI cables must include a test for correct connection of twisted pairs and shielding. Continuity tests check only that wires are making connections on both ends of a cable.

Twisted pairs in the cable must be matched with the correct SCSI signal pairs - otherwise, it is possible to have a SCSI signal (signal and ground pair) placed on wires that are not in the same physical twisted pair (see diagram at right). This will cause crosstalk with resultant SCSI errors.

The SCSI Cable Tester will perform this test, called an Integrity Test.

The continuity test and twisted pair integrity test can be performed on a SCSI cable in about 10 seconds.

For testing cables with the VHDCI connector you will need an adapter. This adapter plugs into the 68-pin HD connector on the ST123 to adapt it to the VHDCI. Depending on the testing you must do, you may need one, two or three of these adapters, Part Number AD1003.

Prevent Costly Downtime

When a SCSI-configured system has a cable problem the symptoms vary greatly, from intermittent operation to SCSI "hangup," resulting in excessive system installation delays and costs.

The SCSI Cable Tester is designed with emphasis on simplicity of use. New users will be able to operate the tester within five minutes.

With today's increased SCSI data rates, cabling becomes an even more critical issue.

Description of Tests

Continuity Test:

A. Tests pin to pin connection of cable.

B. Checks for opens.

C. Checks for wire to wire shorts.

D. Checks for wire to shielding shorts.

Integrity Test:

Tests for twisted pairing. By measuring the capacitive reactance of a signal pair, the integrity test will determine if each signal pair in the cable has proper capacitive reactance. A green LED is associated with each pair of signal lines. If the capacitive reactance of a pair falls within the acceptable reference range, the green LED will light. Should ANY signal pair not pass the test the red Integrity Error LED will illuminate.

SCSI Cables Tested:

50-pin Centronic type cables (alt. 2 - A cable)

50-pin Hi-Density (alt. 1 - A cable)

68-pin Hi-Density (P cable)

Conversion cables:

50-pin Centronic type to 50-pin Hi-Density

50-pin Centronic type to 68-pin Hi-Density

50-pin Hi-Density to 68-pin Hi-Density

Maximum number of pins:

68

Maximum cable length:

200 feet

Specifications For ST123 SCSI Cable Tester:

Safety approvals UL, CSA, TUV, CE EMI/RFI FCC Class A, CE Test Conditions Continuity Test: TTL level signals< Integrity Test: 5 V maximum; current in picoamp range Environmental Relative humidity: 0-95% non-condensing Operating temperature: 0-50°C

Power Requirements Voltage: 115/220 V ac, auto select Frequency: 50-60 Hz, 32 Watts Weight 10 lbs Shipping Weight: 21 lbs Physical Size Height: 4.3 in. (109 mm) Width: 17 in. (432 mm) Depth: 11.5 in. (292 mm) Warranty Two Year Limited Warranty - Specifications subject to change without notice -