Toshiba GR-200 Series Instruction Manual page 777

Manufacturing Message Specification (MMS)
(vii)
MMS is an application layer protocol that provides data transmission between IEDs, which
performs monitoring and controlling; it can provide reliability for the data transmission. The
MMS operates in the international standardized messaging system that are made of TCP/IP
and Ethernet.
Generic Substation Events (GSE)
(viii)
GSE is a control model defined in the IEC 61850 standard; it provides a fast and reliable
method for transferring the event data over the SAS. The GSE provides facility to transfer the
same event message to multiple physical devices using multicast or broadcast service.
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6F2T0200 (0.15)
GRE200 (1,2)