Revised and updated to reflect the many technological advances that have occurred since the publication of the successful first and second editions, this book is an indispensable resource for the technicians who buy, test, install, and troubleshoot modems. Designed to be an integral part of every technician's everyday toolkit, it features clear, concise technical discussions and point-by-point guidelines, along with dozens of handy tables checklists and summaries. The updated material includes two new chapters on Cable Modems and Digital Modems, as well as remote access and PCMCIA.