Keiser.B.E. <br/><br/>
Digital Telephony &Network Integration. 

 - 1st Ed. 
 -  Van Nostrand Reinhold New York.  1985 
 - XVII, 451p.  21 cm. 
<br/><br/><br/>Text in English 
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>ELN
<br/><br/><label>Index Terms--Genre/Form: </label><br/>F-01
<br/><br/><label>Dewey Class. No.: </label>621.385  / KEI