Task: Sentence Expansion
Input (English): Protocols including Packet over SONET / SDH , MPLS , ATM and Frame relay are often used by service providers to deliver the links that are used in WANs .
Output (English): Protocols including Packet over SONET / SDH , Multiprotocol Label Switching ( MPLS ) , Asynchronous Transfer Mode ( ATM ) and Frame Relay are often used by service providers to deliver the links that are used in WANs .