Connecting Switches In A Stack; Stack Configurations - Avaya 4900 Series Installing

Installing Ethernet Routing Switch 4900 Series

Connecting switches in a stack

About this task
Connect a switch to the next unit in the stack through a cascade cable. The stack parameters are
associated with the base unit, the physical stack order depends on the base unit position and
whether you configure the stack cascade up (stack up) or cascade down (stack down). This
designation depends on the stack cabling arrangement.
Note:
Avaya recommends that you use a Cascade Down configuration.
Before you begin
Order the appropriate Avaya Ethernet Routing Switch 4900 Series cascade cables to ensure fail-
safe stacking. For more information, see
Procedure
1. Ensure that all switches for the stack are rack mounted.
2. Slide the Unit Select switches on the back of the units to the appropriate position, depending
on whether they are a base unit or non-base unit:
• Base Unit (Unit 1)- Slide the Unit Select switch DOWN
• Non-Base Unit (Units 2-8)- Slide the Unit Select switch UP
Note:
The Base Unit Select switch defaults to be in the Non-Base position. Only one switch in
the stack must have the Base Unit Select switch set to the Base position.
3. Connect stacking cables as required for a Cascade Up (stack up) or Cascade Down (stack
down) configuration.
See

Stack configurations

Stack configurations
Stack parameters are associated with the base unit, the physical stack order depends on the base
unit position and whether you configure the stack cascade up (stack up) or cascade down (stack
down). The designation depends on the stack cabling arrangement.
Cascade down
In a cascade down configuration, the base unit is located at the top of the stack. The system
automatically numbers the physical units based on the designated base unit (unit 1). The cable
connected to the Cascade Down connector of the base unit terminates in the Cascade Up connector
on the next unit in the stack, which is located below the base unit. This next unit is designated unit 2.
The stack is wired downward through the units and the system continues to number in this manner
February 2016
Cable requirements
on page 46 for cable connection reference.
Installing Avaya Ethernet Routing Switch 4900 Series
Comments on this document? infodev@avaya.com
on page 25.
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