ZYXEL, a leading supplier of high-speed modem/faxes with voice and compatible products, has just released the U-1496P portable modem. It is the first portable modem with auto-switch capabilities for land lines and cellular networks. ''The U-1496P is designed to meet the needs of the growing portable computing marketplace,'' said Gordon Yang, vice-president of engineering. ''There are over 15 million cellular phones and over 10 million laptop/notebook computers in use today. The growth of these two technologies is intertwined. The U-1496P provides linking technology that will enable on-the-go voice/data communications,'' he added. The new U-1496P portable modem incorporates the features and performance of ZyXEL's award-winning high-speed modems with advanced cellular capabilities, while overcoming many of the imperfections of cellular networks, including hand-off and power change problems.