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STH Overview
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Connector Ports (TCUs) for connections to stations and other network
devices.
Figure 1-1. Front and Back Views of the STH-24
Up to four STH hubs can be linked to the same intelligent hub, bringing
the total direct connectivity potential to 120 managed TCU ports in the
stack. Intelligent hubs serve as the logical “top” of the stack and provide
full frame and error statistics for the collective stack, for each individual
device, and for each port. Hubs can be added to and removed from the
stack without powering-down any of the devices involved.
Cabletron’s HubSTACK Interconnect cables, Part Number 9380141, are
needed when stacking hubs.
The STH fully conforms to IEEE 802.5Token Ring specifications for
connectivity to Token Ring equipment. STH hubs offer:
• support for Cabletron Systems’ Automatic Beacon Recovery
Process (ABRP),
• Multiple Ring Out connectivity for Passive MAU workgroups,
• automatic speed fault protection,
• active filtering, re-timing, and repeating circuitry on all ports,
• and LANVIEW LEDs for “at-a-glance” diagnostic monitoring.
The STH does not have management capability and is not intended to be
used as a stand-alone device. Management must be provided by a
Cabletron Systems intelligent hub, either the STHi Stackable Token Ring
Hub with Intelligence or the MicroMMAC intelligent hub.
HubSTACK
STH-24
TOKEN RING HUB with LANVIEW
®
SUPPORTING 100 OHM UTP CABLE
16Mb/s
PWR
STACK
SPEED
4M 16M
STACK
RESERVED
STH-24
TOKEN RING HUB with LANVIEW
®
SN
24X 23X 22X 21X 20X 19X
18X 17X 16X 15X 14X 13X
12X 11X 10X 9X 8X 7X
6X 5X 4X 3X 2X 1X