Helgert, Hermann J., <br/><br/>
Integrated services digital networks :  Architectures, protocols, standards / 
Hermann j. helgert 
 - 449 páginas 
<br/><br/><label>ISBN: </label>0-201-52501-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Redes digitales de servicios integrados
<br/><br/><label>LC Class. No.: </label>TK5103.7  / H45