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|Home > Functional description > About the LPD-Q Q-Channel Distributor > LPD-Q operating in expander mode|
If the SEQUENCER parameter is set to zero, then the LPD-Q operates in expander mode.
In expander mode, when the LPD-Q receives a quiescent entry or exit request on the control Q-Channel, it then sends the request to all the device Q-Channels. The LPD-Q waits for all devices to accept or a denial to occur, before it generates the response to the controller.
The following figure shows the LPD-Q configured as an expander.
When a denial scenario occurs, the LPD-Q returns all device Q-Channels to the running state. The control Q-Channel does not complete until the devices return to the running state.