US 10,693,579 B2 · Transparent clocking in cross connect system

Abstract

A cross connect apparatus or system with transparent clocking, consistent with embodiments described herein, connects a selected source or ingress port to a selected destination or egress port and clocks data out of the selected egress port using a synthesized clock that is adjusted to match a recovered clock from the selected ingress port. A transparent clocking system may generate the synthesized clock signal with adjustments in response to a parts per million (PPM) rate detected for the associated recovered clock signal provided by the selected ingress port. The cross connect system with transparent clocking may be a 400G cross connect system with 10G resolution. The cross connect system with transparent clocking may be used in optical transport network (OTN) applications, for example, to provide an aggregator and/or an add-drop multiplexer (ADM) or to provide a reconfigurable optical add-drop multiplexer (ROADM) upgrade to a higher data rate.

Claims15

Dependent claims

A method for providing transparent clocking between a plurality of ingress ports and a plurality of egress ports in a cross-connect system, the method comprising:

receiving a data signal at a first ingress port of the plurality of ingress ports and recovering a clock signal from the data signal;
generating a synthesized clock signal based on the recovered clock signal, the synthesized clock signal being adjusted to match the recovered clock signal;
passing data representing the received data signal from the first ingress port to a selected one of the egress ports;
and
wherein passing the data representing the received data signal includes clocking the data at the selected one of the egress ports in order to transmit a signal based on the synthesized clock signal such that the clock frequency of the signal transmitted by the selected one of the egress ports substantially matches the clock frequency of the data signal received at the first ingress port.

2 more elements

Dependencies are inferred from the claim text.

Transparent clocking in cross connect system

Life of this patent

Transparent clocking in cross connect system

Life of this patent

Abstract

Claims15