IBM 8239 Token-Ring Stackable Hub, Setup And User Manual

Page: 21 / 141

Chapter 1. Introduction and Planning
This chapter describes the functions of and the physical requirements for the IBM
8239 Token-Ring Stackable Hub (8239). It also contains planning information.
The 8239 is a stackable concentrator, allowing token-ring stations to share a
network. Up to eight 8239s can be interconnected to form a stack. The stack
connection provides a control path as well as a token-ring data path. The control
path is an internal token-ring segment used by the stack units to communicate with
each other. The token-ring data path connects the stack units into a shared
token-ring network for user traffic. The 8239 is available in two models and
provides a range of network management functions.
Models
Both models of the 8239:
¹
Support basic concentrator functions, such as attachment of port stations,
beacon recovery, address-to-port mapping, and so on
¹
Attach up to 16 workstations
¹
Allow you to attach up to 32 workstations with an optional port expansion
feature
¹
Provide configuration and status information for each device through an
out-of-band connection
Figure 1-1. 8239 Model 1

Copyright IBM Corp. 1998
1-1