A faceplate configured for attachment to a communications module may be provided. Generally, an ultrasound catheter includes an elongate flexible catheter body with one or more lumens. Heavier gases are forced to the outer regions of the fan housing while lighter gases remain closer to the fan axis. The pushback message is sent with request gapping information to a previous hop in a network, wherein the previous hop is one or more network elements operable to route the one or more network requests to the network element processing the one or more requests. The refresh controller is configured to assert a refresh write-in signal to write data supplied from the pending write queue specified for an address due for a refresh rather than refresh existing data.