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Installation
Backup Path
In a normal configuration, there is an unused pair of wires in the twisted
pair cable used in the network. This extra pair of wires, used with a
backup circuit inside the MAUs, is called the backup path.
Figure 9.
Backup path
The backup path is designed to enable the network to continue to operate
while a problem such as a faulty cable or MAU is being repaired.
For example, if a breakdown occurs in the cable between MAU 1 and
MAU 2 as in Figure 9, the rest of the ring will remain in operation if the
backup path is used. Note that when the backup path is utilized, it
becomes part of the main ring and its length must be included in the main
ring length. In most situations, the network should be designed to allow
the backup path to be used. The backup path is automatically used by Plus
series MAUs when no connector is inserted in Ring In or Ring Out ports.
15
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