Mike's PBX Cookbook

4000 Series Stacking

You can connect up to eight 4000 Series switches in a stack to provide up to 400 ports. The stack is managed as a single unit.

Steps:

  1. Upgrade all the switches to the same firmware release.
  2. Set the rear Unit Select switch to Base on ONE UNIT ONLY.
  3. Connect the stack using the Cascade DOWN / UP cables.
  4. Loop the last unit back up to the Base unit to make a ring.
Cascade Up, Cascade Down

Only one switch in a stack can be the base unit; ie, with the Unit Select switch in the Base position. All other switches must have the Unit Select switch in the left position. The base unit designation for a switch appears on the front panel LED display.

You can build either a Cascade Down, or Cascade Up configuration, depending on the stack cabling arrangement. Avaya recommends a Cascade Down (stack down) configuration, although either configuration is functionally identical to the other.

The following guidelines apply to stack configuration:

Setting IP parameters

The restore factory-default command resets the switch or stack to its default configuration. When the switch is set to factory default parameters, the CLI Quickstart appears which enables you to set default IP information.

LED indicators

BASE should be green on the base unit. The UP/DOWN LED's of all units should be green. Amber or no LED indicates a problem.
See 4000 Series LED indicators.

Cascade Down

The base unit is located at the top of the stack. The Cascade Down connector of the base unit terminates in the Cascade Up connector on the next unit in the stack, and so on. The unit order is 1, 2, 3.... from the top down. The bottom unit loops up to unit 1.

Cascade Down (Stack Down)
Configuration:
  1. Base Unit
  2. Last Unit
  3. Cascade Cable
  4. Cascade Cable

Stacking 2 switches, connect:
Cascade Down to Up, and
Cascase Up to Down.

Cascade Down (Stack Down) configuration

Cascade Up

The base unit is located at the bottom of the stack. The Cascade Up connector of the base unit terminates in the Cascade Down connector on the next unit in the stack, and so on. The unit order is 1, 2, 3.... from the bottom up. The top unit loops down to unit 1.

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