This Recommendation gives the characteristics of a synchronous mss-connect equipment to be used in a
synchronized digital network and which cross-connects time slots at 64 kbit/s or n x 64 kbit/s frodto any 2048 kbit/s access port.
ITU-T G.796-1992 history
1992ITU-T G.796-1992 Characteristics of a 64 kbit/s Cross-Connect Equipment with 2048 kBit/s Access Ports (Study Group XV) 13 pp