Specifications: 1) E1 interface framing/unframing optional, balanced 120ohm/unbalanced 75ohm optional; 2) In E1 framing mode, time slot No. is optional from 1 to 31; 3) 10Base-T Ethernet interface supports 10M half/full duplex auto-negotiating mode; 4) Supporting master/slave/external clock; 5) Virtues of stable performance, zero pack-loss rate, and time-delay of frame transmission less than 0.4us; 6) Advanced surface welding streamline; 7) Two architecture of stand alone and rack mount; 8) Modular power components in cabinet, optional single-power or double-power of balanced load method;