The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 14, 2004
Filed:
Feb. 14, 2003
Brent K. Parrish, Hollis, NH (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
In one embodiment, a telecommunications device includes a synchronization bus and a controller coupled to the bus that generates a system clock signal according to a primary reference clock signal and communicates the system clock signal using the bus. The controller detects a loss of the primary reference clock signal and, in response, continues generating the system clock signal, determines acceptability of a secondary reference clock signal, switches from the primary reference clock signal to the secondary reference clock signal if the secondary reference clock signal is acceptable, and in response to the switch generates the system clock signal according to the secondary reference clock signal.