Startup protocol for high throughput communications systems

A startup protocol for use in a full duplex four pair communications system having a plurality of transceivers, one transceiver acting as a master transceiver and another transceiver acting as slave transceiver, each master transceiver and slave transceiver having a four pair near-end noise reduction system, a timing recovery system and at least one equalizer, said protocol comprising the steps of:

• executing a first stage during which the timing recovery system and the equalizer of the slave transceiver are trained and the four pair near-end noise reduction system of the master transceiver is trained;
• executing a second stage during which the timing recovery system and the equalizer of the master transceiver are trained and the four pair near-end noise reduction system of the slave transceiver is trained;
• and
• executing a third stage during which the four pair near-end noise reduction system of the master transceiver is retrained.

A startup protocol for use in a full-duplex four pair communications system having a master transceiver at one end of a twisted wire pair and a slave transceiver at the opposite end of the twisted wire pair, each master transceiver and slave transceiver having a four pair near-end noise reduction system, a four pair far-end noise reduction system, a timing recovery system and at least one equalizer, said protocol comprising the steps of:

• during a first phase:
• maintaining the master transceiver in a half-duplex mode during which it transmits a signal but does not receive any signals,
• maintaining the slave transceiver in a half-duplex mode during which it receives the signal from the master transceiver but does not transmit any signals,
• converging the four pair near-end noise reduction system of the master transceiver,
• adjusting the frequency and phase of the signal received by the slave transceiver such that the frequency and phase are synchronized with the frequency and phase of the signal transmitted by the master transceiver,
• converging the equalizer of the slave transceiver;
• during a second phase:
• maintaining the slave transceiver in a half-duplex mode during which it transmits a signal but does not receive any signals,
• maintaining the master transceiver in a half-duplex mode during which it receives the signal from the slave transceiver but does not transmit any signals,
• freezing the frequency and phase of the slave transceiver,
• converging the four pair near-end noise reduction system of the slave transceiver,
• adjusting the phase of the signal received by the master transceiver such that the phase is synchronized with the phase of the signal transmitted by the slave transceiver,
• converging the equalizer of the master transceiver;
• and
• during a third phase:
• maintaining the slave transceiver in a full-duplex mode such that the slave transceiver transmits and receive signals,
• maintaining the master transceiver in a full-duplex mode such that the master transceiver transmits and receive signals,
• reconverging the four Pair near-end noise reduction system of the master transceiver.