IBM System/36 User Manual

Line Continuity and Polarity Tests
Line Continuity
Installation of cabling should include completion tests to ensure
that there are no faults, no high-resistance connections, and no
circuit imbalances. The tests for faults should ensure there are no:
• Open circuits in individual conductors or shields
• Short circuits between conductors of the same pair
• Grounds on individual conductors, either between a conductor
and a shield or between a conductor and a grounded object
• Reversed polarities
The following guidelines can be used for testing line continuity
and polarity. The tests should be made for individual cable
segments; however, they may be used for a complete cable if the
station junctions are connected via an adapter or a work station
having Cable Thru (if the power is off).
3
The only tools required for line continuity checks are an ohmmeter
and jumpers to connect between the connector pins (signal lines)
and the plug body (cable shield). When the following checks are
made, the resistance values measured should fall within the
indicated ranges for the maximum 1525 meters (5000 feet).
With both ends of the cable open and the cable not plugged into a
machine, measure (at ~ither end):
• Conductor-to-conductor: Greater than 1,000,000 ohms
• Each conductor to shield: Greater than 1,000,000 ohms
A reading less than 1,000,000 ohms means there is a short circuit.
a Measurements are not valid with station protectors connected to the line.
40 Preparing to Install Your Work Stations-5364

IBM System/36 Specifications

General

Manufacturer	IBM
Model	System/36
Release Year	1983
Operating System	SSP (System Support Program)
Weight	Varies by model
Dimensions	Varies by model
Storage	Diskette, Hard Disk
Display	Monochrome
Input	Keyboard