Comparison between X.25 and Frame Relay

X.25 : It is a standard ITU-T standard protocol.It consists of PSE packet switching exchange nodes.X.25 model is based on traditional telephony concept. 

Frame Relay : It is a packet switching telecommunication used for efficient data transfer which speeds up the transmission.It is used to connect LAN with public wide area networks. 

Difference between of Frame Relay and X.25 :

Frame Relay	X.25
It has informal data rate	It has fixed data rate
It performs Multiplexing and switching at data link layer	It performs Multiplexing and switching at network layer
Frame Relay does not support Hop-to-Hop error and flow control.	It performs Hop-to-Hop error and flow control at data link layer.
It does not support End-to-End flow and error control.	It performs End-to-End flow and error control at network layer
Congestion control is required in frame relay.	Congestion control is not required in X.25.
Call control signaling requires separate logical connection from user data.	X.25 uses same data for call control signaling.