64*E1 integrated data access device,FXS,FXO,E&M,MS,MSA,HFA optional ... 64*E1Total 16*slot-2*slot for main control board(support backup main control board)-2*slot for power supply board(support backup ... of the same interface board;1+1 Hot backup for Main Control Board and Power Supply Board to guarantee stability and ... or types;SNMP Network Management 64*E1 Integrated Data Access Device DXC comprssion E1