Asante Technologies 1012 - Manual (Page 50)

Page 2-16
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.