Patent ID: 8638657
Filing Date: 2014-01-28
Classification: H04L

Abstract:
1. A method comprising: receiving, by a device, qualification indicators, for a first signal, from line cards of the device; determining, by the device, whether a frequency of a second signal is in use by the line cards; transmitting, by the device and after receiving the qualification indicators, instructions to the line cards to use a frequency of the first signal when the frequency of the second signal is not in use by the line cards; receiving, by the device, a failure indicator, for the first signal, from one of the line cards; determining, by the device, whether information about the second signal is stored; and transmitting, after receiving the failure indicator and when the information about the second signal is not stored, new instructions to the line cards that instruct the line cards to use a qualified frequency previously used by the line cards instead of the frequency of the first signal.