Spotlight On Three Standards: December 2008

New standards cover precision clock synchronization, digital TV and electrical safety code

5 December 2008

IEEE Std. 1588-2008, released in August

The IEEE Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems defines how to synchronize clocks in systems using techniques such as network communication, local computing, and distributed objects. The protocol supports system-wide synchronization accuracy in the submicrosecond range with minimal network and local clock computing resources. The standard includes mappings to UDP/IP, DeviceNet, and a layer-2 Ethernet implementation.


IEEE Std. 1631-2008, released in August

The IEEE Recommended Practice for Measurement of 8-VSB Digital Television Transmission Mask Compliance for the USA covers the theory, techniques, and procedures for measuring the spectral characteristics of 8-VSB transmitters used for terrestrial transmission of digital television in frequencies near assigned channels. The standard explains the characteristics and measurement procedures that ensure all users get comparable results.


Update to 2007 National Electrical Safety Code, released in October

The NESC is considered to be the most important document for safeguarding people from the hazards of installing, operating, or maintaining conductors and equipment in electric power stations and overhead and underground electric supply and communication lines. This update comprises five amendments, including requirements for the enclosure of equipment, load factors for structures, and the use of insulators. The code also has guidelines for electrical wiring and equipment used in all types of buildings.

FOR MORE INFORMATION on these and other standards, visit the IEEE Standards Association Web site, at

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