Cabletron Systems 24 Benutzerhandbuch

 

Page 1-2

 

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

16Mb/s

PWR

STACK

SPEED

4M

16M

STH-24

24X     23X     22X     21X     20X    19X

18X     17X     16X     15X     14X    13X

12X     11X     10X       9X       8X      7X

6X       5X       4X        3X        2X       1X