Frame relay is a packet switching data communication technology where data packets can be of variable size up to 1,600 bytes. A 'frame' is the name given to the packets. Frame Relay is another type of technology that was introduced in the 1990s.
It ideal for use in situations where faster data transfer is required over error-checking and security capabilities, as such it is available at a lower price point. Frame Relay enables users to connect LANs at multiple locations and operates as a Virtual Private Network.
The International Telecommunications Standardization Sector (ITU-T) Frame Relay standard has been adopted to a large part from the ISDN standard.
Customers nowadays prefer using Multi-Protocol Label Switching (MPLS) partly because it offers Class Of Service (COS) that can prioritize between the different types of data packets from voice, fax and other network traffic. MPLS is also easily scalable and offers greater security as traffic is sent over a private data network.