Held, Gilbert <br/><br/>
Voice and data internetworking with IP and frame relay / 
Gilbert Held 
 - 2nd ed. 
 - New York :  McGraw Hill,  2000 
 - 343 p. :  ill. ;  1998 
 - McGraw-Hill series on computer communications .
<br/><br/><label>ISBN: </label>0072122161 
<br/><br/><label>LCCN: </label>98-6456 
<br/><br/><label>Subjects--Topical Terms: </label><br/>TCP/IP (Computer network protocol)<br/>Digital telephone systems<br/>Computer networks<br/>Data transmission systems