
Sample 2: Backup Link Using Alternative Medium
In this topology, the primary link consists of a twisted-pair cable between twisted-pair
ports on a Hub Plus/48 and a Hub Plus; the backup link is from AUI port to AUI port on
the two hubs. Depending on the type of transceivers used, the backup link could use thin
coax, fiber-optic cable, or even twisted-pair cable. Note that any of the network ports on
these hubs can function as a backup to any other port.
Wiring Closet 1 Wiring Closet 2
primary link (twisted-pair cable)
backup link (thin coax, fiber-optic, or twisted-pair cable)
HP
EtherTwist
Hub
HP
EtherTwist
Hub
HP
EtherTwist
Hub
HP
EtherTwist
Hub
HP
EtherTwist
Hub/48
to another network
HP
10:10 LAN
Bridge
Backup Links E-7
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