Held, Gilbert,  1943- <br/><br/>
Digital networking and T-carrier multiplexing / 
Gilbert Held 
 - Chichester :  John Wiley & Sons,  1990 
 - 156 p. :  ill. ;  25 cm. 
<br/><br/><label>ISBN: </label>0471928003 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data transmission systems<br/>Computer networks<br/>Multiplexing