1 EXHIBIT 21.1 LIST OF SUBSIDIARIES OF MICROTEL INTERNATIONAL, INC. 1. XIT Corporation 4290 E. Brickell Street Ontario, CA 91761-1571 2. XCEL Arnold Circuits, Inc. 4290 E. Brickell Street Ontario, CA 91761-1571 3. HyComp, Inc. 165 Cedar Hill Street Marlborough, MA 01752