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|Home > Functional description > About the LPD-P P-Channel Distributor > LPD-P operating in expander mode|
If the SEQUENCER parameter is set to zero, then the LPD-P operates in expander mode.
In expander mode, when the LPD-P receives a request on the control P-Channel, it then broadcasts the request to all the device P-Channels. The LPD-P waits for all devices to accept, or a denial to occur, before it generates the response to the controller.
If any device denies the request, the LPD-P reverts all devices that accepted the request to the previously accepted value. The control P-Channel does not complete until the device P-Channels return to the previous state.