Features ● Provide up to 4E1 channels and 1 optional port 10/100Mbps Ethernet channel ● Fiber port bit rate: 150Mbps, up to 120Km distance without repeater ● E1 Line code: HDB3, compliant to G.703, G.823 and G.742. ● E1 channel support both 75ohm & 120ohm impedance ● Ethernet port support 10/100Mbps auto-detection, Full/Half Duplex auto-negotiation ● Ethernet port can transmit VLAN tag ● Complete alarm functions ● Provide an RS232 asynchronous interface ● Support the local/remote E1 loop back ● Remote loop back provided by software and hardware ● Provide RS232 port for management, GUI interface ● Stand alone,220VAC or -48VDC power supply optional