STHI Overview
HubSTACK SUPPORTING 100 OHM UTP CABLE |
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| TOKEN RING HUB WITH LANVIEW® |
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4M | 16M | RESET |
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| 16 Mb/s | MGMT |
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SPEED |
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24X 23X 22X 21X 20X 19X 18X 17X 16X 15X 14X 13X
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12X | 11X | 10X | 9X | 8X | 7X | 6X | 5X | 4X | 3X | 2X | 1X |
STACK 2 | STACK 3 | STACK 4 | STACK 5 | |||||||||||
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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 amplifying circuitry;
•and LANVIEW LEDs for “at-a-glance” diagnostic monitoring.
1.2.1LANVIEW LEDs
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, LANVIEW LED Signals, for more detail.
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