A communication system, comprising a first node, a second node, a serial communication link between the first node and the second node, configured to transmit digital video data from the first node to the second node over one or more video channels of the link. The hollow body includes a first opening end, a second opening end and a pair of first hooking portions, wherein a bore of the second opening end is larger than a bore of the first opening end. The mat is consolidated and pressed to a final thickness. The diaphragm actuator is typically retained in a device body between the floor seal member and another seal member between which the perimeter of the actuator is sandwiched.