Communication Services; Programming Support - IBM 3270 Manual

Communication Services
Programming Support
This guide will help you provide . .compatibility between these units and the following:
• Work space considerations
• Electrical requirements
• Cable requirements and their installation
• Power cord plug requirements and their installation.
• Environmental requirements
Arrangements need to be made for the installation of the communication facilities
between the 3276 and the host system communication unit/adapter. There must be
compatibility between the 3276, the modems, the communication line, and the
communication unit/adapter; for example, line speed, duplex or half-duplex facilities, and
non-return to zero (NRZ) or non-return to zero inverted (NRZI).
When a 3 276 is attached directly to an IBM 3704/3705 Communications Controller,
there are no modems or communication lines. However, the 3704/3705 and the 3276
must be compatible. It is recommended that you request assistance from your IBM
representative to determine whether the 3704/3705 and the 3276 are compatible.
When the 3276 has a Loop Adapter feature (and is attached to the loop), no modem is
used. The 3276 has a communication cable, called the Loop Station Connector (LSC)
cable, which connects the 3276 to the loop. The same line speed on the loop must be se-
lected and set in the 3276 operator panel drawer to perform the communicate operation.
Compatibility among these components is a major consideration in new installations. To
reduce delays caused by incompatibility, it is recommended that you request assistance
from your communications representative and from your IBM representative to
determine whether the 3276, modems, communication line, and communication
unit/adapter are compatible. In addition, schedules should be established to ensure that
the modems, communication line, and communication unit/adapter are installed and
tested before delivery of the 3276 and the attached units.
It is important to plan for proper programming support at the host system. The 3276
clusters can be added to most 3270 display/printer systems with minimal impact on the
existing programs. In certain cases, however, host system definition (SYSGEN)
parameters will have to be changed to accommodate attachment of a 3276 cluster.
Information concerning programming requirements is included in the following
publications:
• An Introduction to the IBM 3270 Information Display System, GA27-2739
• Introduction to Programming the IBM 3270, GC27-6999
• IBM 3270 Information Display System: Component Description, GA27-2749
In addition,
it
is recommended that for 32 76 clusters you enhance your system
availability and serviceability by installing the Online Test Executive Program (OLTEP) at
the host system. Call your IBM representative for information about OLTEP.
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