Description: The tmnxSonetGroupTable has an entry for each Tributary Unit Group(TUG3) on a path. On a port which supports unchannelized STS-3's, rows in this table are created when a channelized STS-3 has its tmnxSonetPathChildType set to sdhTug3. On a port which does not support unchannelized STS-3's, the rows in this table are implicitly created when a STS-3 is created in the tmnxSonetPathTable. Entries in this table are implicitly deleted when the parent entry of this group is deleted from the tmnxSonetPathTable or if the tmnxSonetPathChildType of the parent is set to something other than sdhTug3.