ict e1-10/100bt is a high performance remote ethernet bridge with self-learning ability connecting two ethernet segments over e1 links. ict e1-10/100bt also functions as a high speed, ethernet interface, synchronous short-range modem operating at full duplex over unconditioned lines. its compact size and low cost make it ideal for cost-sensitive bridging applications or as lan extenders. features:  transparent transport of lan traffic over unframed e1 circuits  full compliance with ieee 802.3 and ethernet v.2  manual/autosensing 10/100 baset lan, half or full duplex  lan cable straight/cross-over auto sensing (auto mdi/mdix)  built-in dynamic mac address lan table (1,024 mac address)  transport super long frame length of 1528 bytes (without crc)  vlan support  monitoring of remote unit status from local unit.  manual reset of remote unit from local unit  auto-reset function: disable or enable (activates when no network traffic signal last for 12 seconds)  automatic filtering/learning/aging of mac address lan table  30,000 frames per second filtering and forwarding rate  clocking: internal, network,  support remote loopback  compact in size and lightweight, only 0.4kg  e1: 75Ω unbalanced or 120Ω field selectable  220vac or -48vdc power supply