Tekelec’s Network Diagnostics Business, which has its headquarters in Morrisville, has been sold to a California firm for $60 million.

Catapult Communications, which is based in Mountain View, and Tekelec announced the sale early this morning.

Cecil Boyd, the Tekelec executive responsible for the unit, also will join Catapult.

Tekelec (Nasdaq: TKLC) and Catapult (Nasdaq: CATT) said Tekelec will receive $42 million cash plus $17.5 million in notes due in 2004.