overview ¤ electrical conversion available between 10/100base-t ethernet interface and g.703 interface; ¤ it is a high-performance and auto-negotiating remote ethernet bridge, small in volume, low in cost, and very adaptable for cost-sensitive application of bridge connection, or can serve as a lan extender or sectionalizer in the bit-stream basic structure. ¤ when applied as extender or sectionalizer, two operating modes of filtration and filtration forbidding are available, to decide if all traffic can be transmitted on the wan line. features complies with the standards of ieee 802.3 protocol, and supports 10m/100m full-duplexing/half-duplexing operating mode at lan port network interface supports auto-negotiation mode and manual setup mode. able to transparently transmit the super-long frames of 1528 bytes (free from crc), and supports ethernet switches with vlan function. built-in dynamic ethernet mac address list (32k bytes) available with filtration, learning, and updating functions for mac address list auto resetting function available; when networking interface has stopped receiving or sending data for about 8 seconds, the automatic resetting circuit can be automatically started, to reduce the workload on system maintenance. automatic resetting function can be forbidden, and time for delay can be doubled. supports two internal clock and network clock operating modes. supports rloop (e1 interface external loop-back) function. ac220v or dc-48v power supply optional