Welcome to the Cabletron Systems STH-22/-24/-42/-44 Stackable Token
Ring Hub User’s Guide. The STH (Stackable Token Ring Hub) is a non-
intelligent hub designed to provide expanded connectivity for Cabletron
Systems’ STHi intelligent hubs and Cabletron Systems MicroMMAC
intelligent hubs. This manual provides installation instructions and
reference information for STH models 22, 24, 42, and 44.
Note: The term STH is used throughout this manual when describing
features and functions that are common to the above listed STH models.
.1 Using This Ma nua l
Read through this manual completely to familiarize yourself with its
content and to gain an understanding of the features and capabilities of
the STH. A general working knowledge of IEEE 802.5 Token Ring data
communications networks and their physical layer components will be
helpful when installing the STH.
Chapter 1, INTRODUCTION, outlines the contents of this manual,
brieﬂy describes STH features, and concludes with a list of related
Chapter 2, REQUIREMENTS & SPECIFICATIONS, describes
installation requirements, network guidelines, and STH operating
Chapter 3, INSTALLATION, contains instructions for installing the STH.
Chapter 4, TROUBLESHOOTING, describes how to use the LANVIEW
LEDs to troubleshoot network problems.
.2 STH Ove rvie w
The STH is a non-intelligent hub which provides expanded connectivity
for Cabletron Systems’ STHi intelligent hubs and Cabletron Systems
MicroMMAC intelligent hubs. Each STH added to an intelligent hub‘s
managed stack increases the LAN’s connectivity by 12 or 24 Trunk