Abstract: Disclosed are a central office module and a remote terminal module for span powering a variety of high speed DS3 and higher-bandwidth communication modules that require sufficiently little power so as to permit their powering over as many as four telephone wires of at least one mile in length. The up to four twisted pairs only provide power between the central office, remote terminal, controlled environment vault, hut or similar location including the telephone room or closet at a large remote site and remote terminal.

Abstract: A system and method for transmitting DS3 signals over long distances over a plurality of twisted pair conductors is provided. A DS3 interface is provided. The DS3 signal is inversely multiplexed into a plurality of data streams. Overhead is added to the data streams to generate packets having stream identifiers and packet number identifiers. At the receive end, received packets are synchronized using the stream and packet number identifiers, and multiplexed back into a DS3 signal. Systems according to embodiments of the invention are compatible with existing loopback codes, passing through a first loopback code received, and optionally entering a loopback mode where more than one loopback code is received consecutively without an intervening loop down code being received. The incorporated technology permits very small packaging and thereby permits use in small outdoor enclosures.