A clock regeneration scheme for a digital communication receiver has a first-in, first-out storage buffer into which received data is clocked in accordance with an input clock signal and a data valid signal. The boost circuits are coupled to another in parallel. Further, a computer program is embedded within the computer readable medium and the computer program utilizes the centralized address book to selectively restrict incoming telephone calls and outgoing telephone calls. The second fibre in the patchcord is a multimode fibre for passing optical signals to the optical receiver of the transceiver. Another output is the refrigerant, now a hot, low pressure gas.