Filter
Top Products
Designing and Expanding the Network 2 - 29
If the primary link experiences a local or remote fault (except Low Light):
❑ The backup link activates within 10 milliseconds
❑ The primary ports disconnect (that is, they do not pass data to and
from the concentrator)
However, primary port diagnostics continue to operate. When the fault
clears, the primary port is enabled automatically. Once a switchover occurs,
the redundancy status indicators blink.
Each redundancy status LED (located beneath the Activity LEDs):
❑ Is off - If you disable redundancy
❑ Is on - If you enable redundancy and both ports are operational
❑ Blinks - If a switchover occurs due to a link failure
Implementing Total Backbone Fault Tolerance
You can add a backup ONline System Concentrator to provide total
backbone tolerance and link redundancy for your backbone network. As
shown in Figure 2-11, if the primary concentrator or any primary links fail,
the backup concentrator takes over. In this configuration:
❑ One port on the 10BASE-FB Module connects to the primary
concentrator
❑ The other port connects to the backup concentrator
You must also have a direct connection between the two concentrators.