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Type 3A Dual Speed (16/4Mbps) Communication Adapter
Storage
This adapter provides the ability to operate on an IBM Token-Ring Network at
either 16Mbps or 4Mbps. If the 16/4Mbps Token-Ring Network Gateway feature is
ordered, this adapter comes with the gateway feature. It can also be ordered
separately.
This adapter is a base feature on models 13R and 63R. It is optional on these
models: 1L, 11L, 1R, 11R, 2R, 12R, 3R, 51R, 61R, 52R, 62R, and 53R.
Large-cluster models 11L, 11R, 12R, and 13R of the 3174 controller have 2MB of
base storage. (One MB equals 1 048 576 bytes.) Models 1 L, 1 R, 2R, and 3R have
1 MB of base storage. Medium-cluster models 51 Rand 53R have 1 MB; models 61 R,
62R, and 63R have 2MB of base storage. Model 52R has 512KB of base storage.
Of the sma"-cluster controllers, models 81 Rand 82R have 1 MB base storage, and
the 91 Rand 92R have 2MB.
Each controller model has one diskette drive. The following models have a 2.4MB
diskette drive: 11 L, 11 R, 12R, 13R, 61 R, 62R, 63R, 91 R, and 92R. Other models
have a 1.2MB diskette drive. Each diskette drive supports
5-1/4-inch, high-capacity diskettes. Large- and medium-cluster controllers can
have a second diskette drive or a 20MB Fixed Disk.
These storage features are designed to support a" basic functions. For information
about additional features and storage needs, refer to the next section.
3174 Storage Expansion
Some functions and features that controller models support may require additional
storage. For example,
• Token-Ring Network Gateway feature
• Central site change management utility
• Downstream load (DSL)
• Asynchronous Emulation Adapter
• Multiple Logical Terminals
• Single Link Multi-Host Support
a" requi re some form of additional storage.
Controllers provide for storage expansion in different ways, depending upon the
model type. Large-cluster models 1 L, 11 L, 1 R, 11 R, 2R, 12R, 3R, and 13R have two
card slots reserved for storage expansion; medium-cluster models 51 R, 52R, and
53R have one card slot reserved. Medium-cluster models. 61 R, 62R, and 63R have
one module slot reserved for storage expansion. Small-cluster controllers do not
support this feature.
The 3174 Storage Expansion Feature card is available in either 1 MB size or 2MB
size. The cards, in combination with 3174 base storage, can provide different
maximum storage amounts for controllers supported by different configuration
types.
2-10
IBM 3270 Information Display. System 3174 Establishment Controller Introduction
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