Cabletron Systems STHI 用户手册

 

Page 1-2

 

Figure 1-1. Front and Back Views of the STHI-24

The STHI may be installed as a fully managed stand-alone device, or it 
may be stacked with up to four STH hubs, each of which adds 12 or 24 
TCU ports to the LAN, bringing the total count to a maximum of 120 
managed TCU ports in the stack. The STHI serves as the logical “top” of 
the stack and provides full frame and error statistics for the managed ring.

The STHI fully conforms to IEEE 802.5 Token Ring specifications for 
connectivity to Token Ring equipment and offers the following Token 
Ring enhancement features:

 

•

Local Management, a user interface for management control;

•

Cabletron Systems’ Automatic Beacon Recovery Process (ABRP);

•

Multiple Ring Out connectivity for Passive MAU workgroups;

•

automatic speed fault protection;

•

active filtering, 

 

equalizing, and amplify

 

ing circuitry;

•

and LANVIEW LEDs for “at-a-glance” diagnostic monitoring.

 

Cabletron Systems’ LANVIEW status monitoring and diagnostics system 
is an array of LEDs which helps users to diagnose power failures, 
beaconing conditions, cable faults, and connection problems. Refer to 
Section 4.1, 

 

, for more detail.

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

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

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

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

RI 

RESET

CPU

ACT

MGMT

16 Mb/s

SPEED

16M

4M

COM 

RO