UPDATE 1-Ixia to buy Catapult for $105 mln

* Ixia to buy Catapult for $9.25/shr

* Catapult's CEO, director with 37 pct stake agree to deal

* Ixia sees deal adding to non-GAAP shr by Q4

May 12 (Reuters) - Ixia (XXIA.O), a provider of Internet protocol performance test systems, agreed to buy digital telecom test systems supplier Catapult Communications Corp CATT.O for about $105 million, to boost its 3G and 4G wireless test market.

The $9.25 per share cash deal offers a 14 percent premium to Catapult's Monday's close of $8.11.

Catapult Communications' chief executive, Richard Karp and director, Nancy Karp, who together hold about 37 percent of the company's outstanding shares, have agreed to tender their shares in favour of the deal, the company said in a separate statement.

The deal will be conducted via a tender offer for all of the outstanding shares of Catapult, followed by a second-step merger, Ixia said in a statement.

Ixia expects the deal to add to non-GAAP earnings as early as the fourth quarter of 2009.

Shares of Ixia closed at $5.47 Monday on Nasdaq. (Reporting by Savio D'Souza in Bangalore, Editing by Sweta Singh)