64*E1 integrated data access device,FXS,FXO,E&M,MS,MSA,HFA optional;V.35,V.24,X.50,RS485,RS422,G.703,UIF(ISDN 2B+D) 10Base-T 64*E1Total 16*slot-2*slot for main control board(support backup main control board)-2*slot for power supply board(support backup power supply board)-12*slot for various data/voice interface(with backup main control board) or 13*slot(without backup main control board)8*E1 ...