ATSC APPROVES NEW RECOMMENDED PRACTICE
Design of Synchronized Multiple Transmitter Networks

WASHINGTON, D.C., September 25, 2004 – The Advanced Television Systems Committee, Inc. (ATSC) has approved an important new Recommended Practice – A/111, “Design of Synchronized Multiple Transmitter Networks.” This informative document provides guidance on the design of specialized transmission facilities that utilize multiple transmitters to cover a station’s service area. Single Frequency Networks (SFNs) and Multiple Frequency Networks (MFNs) can be used to address specific signal coverage issues, including those relating to difficult terrain. As described in A/111, these networks can be implemented using Digital On-Channel Repeaters (DOCRs), Distributed Transmission (DTx) systems, or Distributed Translators (DTxRs). A/111 focuses on the design aspects of SFNs.

“The benefits of SFNs described in A/111 include more uniform signal levels throughout the area being served, reduced interference, fewer terrain limitations and more reliable indoor reception,” said Merrill Weiss, who led the ATSC effort to develop the new Recommended Practice. “A/111 is required reading for anyone interested in the design of Single Frequency Networks.”

A/111 was developed in the ATSC Specialist Group on Transmission (T3/S9). The document is a companion publication to ATSC Standard A/110, which describes the means to synchronize the emissions of multiple DTV transmitters. This capability is necessary to making a Distributed Transmission system practical. A Recommended Practice is a document that typically provides guidelines for operation and performance. The ATSC has adopted a variety of recommended practices for different industry segments in the DTV field.

The Advanced Television Systems Committee, Inc. is an international, non-profit organization developing voluntary standards for digital television. The ATSC member organizations represent the broadcast, broadcast equipment, motion picture, consumer electronics, computer, cable, satellite and semiconductor industries.

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Contact: Lisa Hester at ATSC (202) 872-9160