... X.50,RS485,RS422,G.703,UIF(ISDN 2B+D) 10Base-T 64*E1Total 16*slot-2*slot ... .703,4*UIF(ISDN 2B+D),4*10Base-T optionalSupport work under standard DXC mode(E1 Digital Cross Connection) ... over five to seven km by the ISDN 2B+D Data interface board;Possessing 10Base-T Ethernet bridge ... supports VLAN transparent cutting through;Powerful time slots expansion DXC function with a 2048×2048 exchange network array ...