Viswanathan, Thiagarajan ; Bhatnagar, Manav <br/><br/>
Telecommunication switching systems and networks 2nd ed. 

 - PHI learning pvt. ltd.  Delhi  2015 
 - xx,620 
<br/><br/>
<br/><br/><br/>E 
<br/><br/><label>Universal Decimal Class. No.: </label>621.38  / Vis/Bha