Asante Technologies 1012 manual If the Main Hub Goes Down, If a Link Goes Down to the Main Hub

Chapter 2 — Connecting to the Network

In Figure 2-8, there are three AsantéHubs and an AsantéBridge in the network.These devices have workstations, printers, etc. con- nected to their twelve front panel ports.These hubs (and their cli- ents) communicate with each other and to devices on the main network backbone through the main hub (shown as the AsantéBridge in the illustration).They use 10T cabling to connect each of their 3in1 Uplink ports to a front panel port on the main hub.The three hubs are also connected to the main network back- bone's BNC (thin Ethernet) cabling. Since Auto-sense checks for cabling using the priority sequence of AUI, then 10T, and finally, if neither AUI nor 10T cabling exists, BNC, the hubs will communi- cate through their 3in1 ports using the 10T media rather than the BNC.The main hub's 3in1 Uplink uses its BNC port to connect to the main backbone.

If the Main Hub Goes Down

If the main hub goes down, the other three hubs' 3in1 Uplink ports will detect that their 10T links have failed when they per- form a Link Integrity Test.This causes them to switch over to the BNC cabling of the main network backbone, thus allowing them continued communication with each other and with devices on the main backbone.

If a Link Goes Down to the Main Hub

If the main hub is up and running, but one or more of the other three hubs has its 10T link to the main hub go down, the follow- ing would occur.A hub losing its 10T link to the main hub would detect such a problem when it performed a Link Integrity Test for its 10T connection on its 3in1 Uplink port.When the 10T link failed, that hub would then switch to communicating through its 3in1 Uplink port via BNC cabling.

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