Jennings, Fred. <br/><br/>
Practical data communications :  modems, networks and protocols / 
Fred Jennings. 
 - Oxford ; Boston :  Oxford ; Boston :  Blackwell Scientific,  1986. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0632013060 (pbk.) 
<br/><br/><label>LCCN: </label>gb 87004401 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Modems.<br/>Computer network protocols.<br/>Computer networks.