A method for deep paging in a communication system employing orthogonal channelizing codes, such as Walsh sequences, of predetermined length m, that does not require a high powered paging channel. This filter is characterized in that the frequency domain response meets the Nyquist criteria and that the square root of the frequency domain response has a first derivative that is continuous at all points. The source node establishes a lower bound on the distance between the source node and the target node based on a measure of the time required to effect this query-response sequence including the time required to communicate the query and response, as well as the time required to process the query and generate the response. The intermediate beams collectively form an output beam that has a reduced coherence compared to the input beam. The third transistor initializes a voltage of a second node according to a second scan signal. A plurality of motherboards of the tester are vertically mounted and connected to memory devices to be tested mounted on an interface board via a HiFix board so that a memory application tester may test more memory device simultaneously, and a limit in the trace length due to the integration of the motherboards is effectively solved.