	US 7,457,234 B1
	System and method for protecting communication between a central office and a remote premises
John B. Bartell, Madison, Ala. (US); Dean D. Bekken, II, Madison, Ala. (US); and Mark J. Ogden, Owens Cross Roads, Ala. (US)
Assigned to Adtran, Inc., Huntsville, Ala. (US)
Filed on Mar. 01, 2004, as Appl. No. 10/790,158.
Claims priority of provisional application 60/475849, filed on Jun. 03, 2003.
Claims priority of provisional application 60/470374, filed on May 14, 2003.
Int. Cl. H04J 1/16 (2006.01); H04J 3/14 (2006.01)

U.S. Cl. 370—216 [370/218]

21 Claims

1. A data communication system for communicating data between a central office and a customer premises that is remotely located from said central office, comprising:

a first transceiver coupled to a first subscriber line extending from said central office to said customer premises, said first transceiver configured to communicate with a transceiver located at said central office;

a second transceiver coupled to a second subscriber line extending from said central office to said customer premises; and

control logic residing at said customer premises, said control logic configured to detect an error condition associated with communication between said first transceiver and said transceiver located at said central office, said control logic configured to transmit, in response to a detection of said error condition, a switch notification to said central office via said second transceiver and said second subscriber line, wherein at least one component at said central office is configured to route data over said second subscriber line in response to said switch notification, wherein a first chassis and a second chassis are located at said central office, wherein said transceiver located at said central office is mounted in said first chassis, and wherein a third transceiver mounted in said second chassis is configured to receive said switch notification and to backup said transceiver mounted in said first chassis based on said switch notification.