IBM 3174 Introduction

• Only one cable is required to connect a controller and a 3299. Because each
3299 can attach a maximum of eight terminals, four 3299s can attach thirty two
3270 terminals to'a controller.
•
Terminals can be attached to the 3299 by cables from a distance as far as 1500
meters (4920 feet) away. This means that the terminals can be 3000 meters
(9840 feet) from a
controller, which is twice the distance allowed for directly
cabled terminals.
• The 3299 can be attached to all 3174 Establishment Controller models.
• The 3299 Model 2 is a replacement for the Model 1 in installations using
coaxial cable.
In addition, the Model 2 is attached directly to the IBM Cabling
System,
elimi'nating the need for baluns at the 3299 ends of the cables.
• The 3299 Models 2 and 3 are attached to a controller using the IBM Cabling
System without requiring a balun at the 3299 end of the cable. Baluns are not
required at the 3174 end of
tt)e cable.
Specified twisted-pair wire is used to attach the terminals to the Model 3. The
terminals will usually require a coax-to-twisted-pair adapter for attachment to
twisted-pair wire.
3814 Switching Management System
The IBM 3814 Switching Management System switches processor channels among
I/O controllers in a data processing center. Its modular design allows individual
3814 units to be distributed through a large processing center to put switching
capability where it is needed. The 3814 lets you switch resource pools among
processors, back up
failing processors and devices, and balance the workload
among processors.
This makes it easier for you to manage the resources in your
data center. Using the 3814 you can:
• Rapidly configure your resources among the channels of one or more IBM
System/370, 30xx, or 43xx processors
• Provide alternative paths to critical devices
• Incr~ase the number of possible controller configurations on each channel.
These are some of the characteristics of the 3814:
• Allows remote control of switching (you can locate the switching console up to
305 meters [1000 feet] away from the 3814)
• Uses operator control on a 3178 or 3278 display terminal or a 3270 PC, or if the
system attachment feature is
installed, on a host-attached terminal
• Uses prestored configurations for rapid, error-free reconfigurations
• Switches immediately or synchronously with a lull in channel traffic
• Has an online help facility (USERINFO) that you can tailor for your own use
• Generates a log record file
• Prints to a 3287 printer
• Allows password security
• Has self-diagnostics.
Chapter 2. Features and Functions of the 3174 Controller 2-21

IBM 3174 Specifications

General

Brand	IBM
Model	3174
Category	Controller
Language	English