Preferred embodiments of the present invention are directed to systems for phase measurement which address the problem of phase noise using combinations of a number of strategies including, but not limited to, common-path interferometry, phase referencing, active stabilization and differential measurement. The adaptive unit, or sealing current derivation device, is preferably deployed at remote terminals thereby facilitating the offering of new DSL service, but may also be utilized in a central office. The IOM does this by examining forward error correction check symbols encapsulated into each chunk. The fluid delivery components may include a pressure regulator, a backflow preventer, filters, cooling misters and dispensing valves such that the such that the fluid source integrity is protected, the fluid purity is improved, and the air within the housing is cooled which in turn provides cooling to the fluid delivery components and the fluid itself.