TY  - GEN
AU  - Khan, Mahmood Ashraf
TI  - understanding packet switching and frame relay
SN  - 9698627014
U1  - 004.67,MAH 
PY  - 2003///
CY  - ABC
PB  - Islambad
N1  - Section I: Packet Switching and X.25 (Page-1), Section II; Frame Relay (Page-32)
ER  -