A pump source for a fiber Raman amplifier used in a WDM optical communication system is formed to generate an RF-modulated pump signal. The network includes a plurality of local servers to store subsets of the viewable data objects, a plurality of links to couple each local server to a set of viewer receivers without coupling the viewer receivers together, and at least, one storage server. When baseline shift is detected in the baseline portions of the readback signals at a predetermined margin threshold, the response characteristics of the adjustable filter are adjusted to remove the detected baseline shift from the readback signals. The second section comprises a stop face designed to be brought to bear against the implement when securing the implement to the implement coupling.