MORRISVILLE,Tekelec, which in July sold its Morrisville-based diagnostics unit for $60 million, is expanding its operations by opening an office in Beijing, China.

Tekelec says it hopes to capitalize on China’s rapidly growing wireless market and will focus on next-generation services.

The company also announced its second quarter earnings after the markets closed on Thursday. Tekelec (Nasdq: TKLC) reported revenues of $80 million and earnings of 10 cents per share. Revenues were up 13 percent over the same quarter in 2001, the company said, and earnings increased seven cents.

Tekelec stock closed at $6.56 on Thursday, down 18 cents. The stock traded over $20 as recently as December.