Held, Gilbert. <br/><br/>
Data communications networking devices operation, utilization and LAN and WAN internetworking 
Gilbert Held 
 - 4th. ed. 
 - New York  John Wiley & Sons, Ltd.  1999. 
 - 855p.  ill.  26 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>047197515X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer networks<br/>Computer networks--Equipment and supplies<br/>Data transmission systems