Jennings, Fred. <br/><br/>
Practical data communications :  modems, networks and protocols / 
Fred Jennings. 
 - Oxford :  Blackwells Scientific Publications,  1986. 
 - xv, 243 p. 
 - Industrial computing series .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer networks.<br/>Data transmission systems.