Features Support 4×10/100Base-Tx FE over 1xE3/DS3 channel; Customer should offer E3 or DS3 separately, E3 and DS3 cannot be supported simultaneously; Comply with IEEE802.3; Automatically restrain broadcast storm; Support diagnostic tools for TDM and Ethernet networks, for fast isolation of network problems, saving time and costs; Rich alarm indications such as E3/DS3 AIS/LOS,