Nortel BayStack 5520-48T-PWR Install Manual page 37

Placement options and cables 37
configuration, the base unit discovers the stack in a cascade up (stack
up) direction. The following illustration shows a cascade up (stack up)
configuration.
Figure 5
Cascade up configuration
For stack installation procedures, see "Stack configuration" (page 88).
Redundant cascade stacking
The 5000 Series switches allow a stack of up to 8 units in a pure 5600
Series stack, a 5500 Series, or hybrid stack into a dual-path cascade
stack. If any single unit fails or if a cable is accidently disconnected, other
units in the stack remain operational without interruption.
In addition to increasing bandwidth, the software uses the cables to
provide two paths between units. If one path breaks the data travels over
the remaining path with half the normal inter-switch bandwidth.
ERS 5000 Series Installation
NN47200-300 04.03
13 April 2009
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