... LAN connection field.Features:*Comply with ITU V.35,G.703,G.704,G.706,G.823 ... and 120ohm(balanced) optional*For data interface, V.35 and V.24/RS232 optional*Comprehensive LED indicators on ... equipment working state*Stand-Alone and Rack-Mount type available*16-slots,elaborate cooling design and two ... Local analogy loopback,Remote digital loopback;DCE interface:V.35 or V.24/RS232C;Power supply:220V +/- 10 ...