TY  - BOOK
AU  - Syed Iftikhar Ahmed Shah 
AU  - Roll No. 01BS(CS)26
AU  - Supervisor - Engr. Intesab Hussain Sadhayo
AU  - Bashir Ahmed Chandio (Roll No. 01BS(CS)02)
AU  - Akhtar Rasool Rajput (Roll No. 01BS(CS)25)
TI  - Public Switching Telephone Network
U1  - R/5BS(CS)01 
PY  - 2005///
CY  - Nawabshah
PB  - QUEST
ER  -