Long-distance telephone service was knocked out for hours Sunday in much of Utah when US WEST lost two of its transmission channels near Ephraim, a company spokesman said.

Steve Linton said the trouble was first noted about 9:50 a.m. and traced to one of three microwave transmitter sites atop mountains in the Ephraim area. He said both the primary and backup radio channel failed."A good portion of southwestern Utah was affected, as well as long-distance traffic between St. George and Provo and about half in Salt Lake," he said. The outage blocked long-distance communications between Cedar City and Provo, and about half the long-distance traffic between Cedar City and Salt Lake, he said.

Service was completely restored by 4:30 p.m., Linton said.