... loop functions: local E1 loop, remote E1 loop. 4). Ethernet transmission transparent,support AUTO-MDIX, straight and crossover auto-adapt ... Can transmit super-long frame of IEEE 802.1Q, support Ethernet exchanger with VLAN function. 7). Support E1 channel hot ... 120Ω)E1 Impedance: 75Ω(unbalance), 120Ω(balance).10/100 Base-T interface:Interface Rate: 10/100MbpsDuplex: half and full duplex self-adapt. ...