IBM 3174 Introduction

Large-cluster models 11 L, 11 R, 12R, and 13R have 2MB base storage in one card
slot.
Two other slots can hold storage expansion cards that can provide a possible
total of 6MB. However, if these
controller models run under Configuration
Support-A
or -S Release 5.0, 4MB of that possible total is supported. If the
controller models are supported by Configuration Support-B, 6MB of storage is
supported.
Large-cluster models 1
L, 1 R, 2R, and 3R have 1 MB base storage in one card slot.
Two
other slots can hold storage expansion cards that provide a possible total of
6MB (if a 2MB card replaces the 1 MB card in the
first slot). However, if these
controller models run under Configuration Support-A or -S Release 5.0, 4MB of that
possible total is supported.
If the controller models are supported by Configuration
Support-B, 6MB of storage is supported.
Medium-cluster models 51 Rand 53R have 1 MB of base storage. As much as 2MB
of storage can be added to
this base amount (using the one card slot) for a
possible total of 3MB. The Model 52R has 512KB of base storage. Storage can be
expanded on this model to a
maximum of 1.5MB.
Medium-cluster models 61 R, 62R, and 63R have 2MB of storage and can be
expanded to as much as 4MB (using the one module slot).
Storage expansion
is not supported in the small-cluster models of the controller.
Models
81 Rand 82R have 1 MB of base storage, and models 91 Rand 92R have
2MB of base storage.
Encrypt/Decrypt Adapter
The Encrypt/Decrypt Adapter feature is supported in the following:
• Configuration Support-A (Release 3 and higher)
• Configuration Support-S (Release 4 and higher).
It is supported on models 1 R, 2R, and 3R.
Concurrent Communication Adapter (CCA)
The Concurrent Communication Adapter (CCA) enables large- and medium-cluster
controllers to communicate simultaneously with additional host processors. Each
processor card provides one additional communications link. When the Concurrent
Communication Adapter is installed in a controller, the
terminals attached to the
controller can communicate with each host to which the controller is attached, with
the exception of
ASCII terminals.
An optional feature, the Concurrent Communication Adapter does not affect
compatibility with existing host interfaces, host software or protocols, or 3174
features and functions.
Small-cluster controllers do not support this adapter, and
medium-cluster models 52R and 53R do not support it. It is optional on all other
models. For more information about the Concurrent Communication Adapter, see
your IBM marketing representative.
Chapter 2. Features and Functions of the 3174 Controller 2-11

IBM 3174 Specifications

General

Brand	IBM
Model	3174
Category	Controller
Language	English