Patent ID: 7764133

Claim:
A communication device, comprising: transceiver circuitry for transmitting and receiving communication signals within a wired, fiber-optic or wireless data system wherein the communication device receives a reference clock signal from a remote device and extracts a reference clock from the reference clock signal; a crystal oscillator that generates an oscillator reference clock; a first temperature control system that further includes a first temperature control logic that adjusts temperature settings to maintain a constant first ambient temperature for the crystal oscillator; a second temperature control system that sets a second ambient temperature according to temperature control commands; a second temperature control logic that generates the temperature control commands to the second temperature control system to set the second ambient temperature for the crystal oscillator; and wherein: the communication device generates a correction signal and a corrected clock based on a difference between the extracted reference clock and the oscillator reference clock; the second temperature control logic generates the temperature control commands for the second temperature control system according to a temperature training profile; and the communication device trains an adaptive control algorithm based on the correction signal in relation to a determined crystal oscillator frequency drift.