Chapter 4. Cable Requirements; Cable Information; Cable Length - IBM System/38 Instruction Manual

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CABLE INFORMATION
This chapter provides cable information you will need as
you plan your installation.
The person making your floor plan of the data
processing area needs to know the maximum cable
lengths to determine device locations. When the floor
plan is complete. provide a copy of it. or the length of
all variable-length cables. to the person completing the
Cable Summary Chart.
Cable Length
The cable to the system unit from the 5211 or the
3262-B1 is 6.1 meters (20
ft.)
long; the cable from the
5424 to the system unit is 2.0 meters (6.5
ft.)
long. All
other cables have variable lengths up to the maximum
lengths shown in the Cable Summary Chart in this
chapter. IBM provides all of these cables (except the
cables between the system unit and work stations);
these cables are made to order so that they are long
enough to connect units without having excess cable on
the floor.
Making variable-length cables to your specifications
requires extra time. Therefore. as soon as you have
determined a final floor plan. contact your IBM
representative and give him the lengths for the cables
you need to ensure you have the cables before your
system arrives.
Chapter 4. Cable Requirements
Cable length can be determined by measuring the path
the cable takes from the cable entry/exit cutout on the
device to the cable entry/exit cutout on the 5381
System Unit.
When you measure to or from a cable entry/exit hole
(shown as
~
on plan views and templates). you
must remember the following:
• Include the distance from the edge of the unit to the
center of the cable entry/exit
hole~
the unit.
• Never include any other undercover cable
measurements; IBM allows for these when building
the cables.
• If you plan to run a cable under a raised floor. add
twice the height of the raised floor to the length of
the cable route between the attached unit and the
system unit.
Measure work station cables from the connector on the
outside cover of the work station to the connector on
the outside cover of the system unit (see note).
Consider these facts when making this measurement:
• Measure along the intended cable route. including
diagonal and vertical cable runs in this measurement.
• The cable connectors on the system unit are mounted
about 0.5 meter (1-1 /2
ft.)
from the floor and are
aligned with the cable entry / exit hole.
• The system unit provides a cable clamp at the bottom
of the cover near the cable entry. Cables should be
routed through this clamp. then to the connectors.
Add 0.6 meter (2 ft.) to the length of each work
station cable to provide cable slack needed to service
the system unit.
Cable Requirements
4-1

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