This standard defines a protocol and procedures for the transport of timing over bridged and virtual bridged local area networks. It includes the transport of synchronized time, the selection of the timing source (i.e., best master), and the indication of the occurrence and magnitude of timing impairments (i.e., phase and frequency discontinuities). The PDF of this standard is available at the IEEEGET program. The "IEEE Get Program" grants public access to view and download individual PDFs of select standards at no charge. Visit http://standards.ieee.org/about/get/index.html for details.