US 2001/0019581 A1 · Startup protocol for high throughput communications systems

Abstract

A startup protocol is provided for use in a communications system having a communications line with a master transceiver at a first end and a slave transceiver at a second end, each transceiver having a noise reduction system, a timing recovery system and at least one equalizer all converging at startup of the system. The operation of the startup protocol is partitioned into stages. The first stage includes the step of converging the equalizer and the timing recovery system of the slave while converging the noise reduction system of the master. Upon completion of the first stage the protocol enters a second stage which includes the step of converging the equalizer and the timing recovery system of the master, converging the noise reduction system of the slave, freezing the timing recovery system of the slave, and resetting the noise reduction system of the master. Upon completion of the second stage, the protocol enters a third stage which includes the step of reconverging the noise reduction system of the master. The protocol then enters a fourth stage in which the master transceiver and the slave transceiver are ready to communicate with each other.

Claims28

Dependent claims

In a communications system having a communications line with a master transceiver at a first end and a slave transceiver at a second end, each transceiver having a noise reduction system, a timing recovery system and at least one equalizer, all converging at startup of the system, a startup protocol comprising the step of:

for each transceiver, separating the convergence of the equalizer and the timing recovery system from the convergence of the noise reduction system.

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

15 more elements

A startup protocol for use in a communications system having a plurality of transceivers, a first one of the transceivers acting as a master and a second one of the transceivers acting as a slave, each transceiver including a transmitter and a receiver, comprising the steps of:

initially operating each of the first and second transceivers only as a transmitter and the other of the first and second transceivers only as a receiver to minimize a change in the operation of the transmitting transceiver transmitter as a result of the operation of the transmitting transceiver receiver and to provide adjustments in the timing of the receiving transceiver in accordance with the timing of the transmitting transceiver, and
thereafter operating each of the first and second transceivers simultaneously both as a transmitter and a receiver to minimize a change in the operation of the transmitter in the first transceiver as a result of the operation of the receiver in the first transceiver.

A startup protocol for use in a communications system having a plurality of transceivers;

a first one of the transceivers acting as a master and a second one of the transceivers acting as a slave, each of the first and second one of the transceivers including a transmitter and a receiver, comprising the steps of:
initially operating, in a first phase, the first transceiver only as a transmitter and the second transceiver only as a receiver and adjusting the timing of the second transceiver in accordance with the timing of the first transceiver and minimizing a change in the operation of the first transceiver as a transmitter as a result of the operation of the first transceiver as a receiver, and
thereafter operating, in a second phase, the first transceiver only as a receiver and the second transceiver only as a transmitter and adjusting the timing of the first transceiver in accordance with the timing of the second transceiver and minimizing a change in the operation of the second transceiver as a transmitter as a result of the operation of the second transceiver as a receiver.

Dependencies are inferred from the claim text.

Startup protocol for high throughput communications systems

Life of this patent

Startup protocol for high throughput communications systems

Life of this patent

Abstract

Claims28