What is the fine-grained topic of the following text: ASN will supply its WSS reconfigurable optical add-drop multiplexer underwater repeaters that, Southern Cross says, will ensure the cable is compatible with future generations of submarine line terminal equipped with probabilistic shaping technology. Only return the topic.
Supply of WSS reconfigurable optical add-drop multiplexer underwater repeaters by ASN to Southern Cross for future compatibility with probabilistic shaping technology.