Small-Cluster Controllers; 3174 Model81R - IBM 3174 Introduction Manual

Small-Cluster Controllers
3174 Model81R
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Figure 3-3. 3174 Establishment Controller Models 81 R, 91 R, 82R, and 92R
The 3174 Model 81 R (shown in Figure 3-3) is a small-cluster controller designed
for remote operations. It contains a Type 1 Communication Adapter that provides
EIA 232D/CCITT V.24 and CCITT V.35 interfaces for SNA/SDLC, BSC, or X.25
remote link attachment. It has 1 MB of base storage and one 5-1/4-inch, 1.2MB,
high-capacity diskette drive. A four-port terminal adapter supports four terminals
directly or eight 3270 terminals through an IBM 3299 Terminal Multiplexer.
Customizing is performed with a control unit terminal attached to port 0 of the 3174.
Any terminal can be attached to port 0 at other times. The Model 81 R supports full
keyboard utilities.
Subsystem online tests and problem determination are performed through a
control unit terminal attached to any port or multiplexer without interrupting other
terminals attached to the 3174. Offline tests are performed through the 3174
control panel.
The 81 R controller supports no customer-installable features.
Chapter 3. Models of the 3174 Establishment Controller
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