Khan, Mahmood Ashraf <br/><br/>
understanding packet switching and frame relay / 
Mahmood Ashraf Khan, 
 - ABC  Islambad  2003 
 - 117 p 
<br/><br/>Section I: Packet Switching and X.25 (Page-1), Section II; Frame Relay (Page-32). 
<br/><br/><label>ISBN: </label>9698627014 
<br/><br/><label>Dewey Class. No.: </label>004.67,MAH