throughout the stack. In this configuration, the base unit discovers the stack in a cascade down
(stack down) direction.
1. Base Unit
2. Last Unit
3. Cascade or Stack Cable
4. Cascade/Stack Cable (Return cable to make stack resilient. Use longer
Stack Cable if required)
Figure 12: Cascade Down (Stack Down) configuration
Cascade up
In a cascade up (stack up) configuration, the base unit is physically the bottom unit in the stack. The
cable connected to the Cascade Up connector of the base unit terminates in the Cascade Down
Stacking
February 2016 Installing Avaya Ethernet Routing Switch 4900 Series 47
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