ict 4e1-10/100bt is an inverse multiplexer transmitting one ethernet channel over multiple e1 links, bundling up to 4e1 (max.7.68mbps full-duplex). it allows bridge and routers to operate at their fastest rates. it also provides high speed access to sdh/sonet backbones where the only access services available are e1 lines. ict 4e1-10/100bt has a 10/100 ethernet bridge with vlan support for lan-to-lan applications over four e1 links. if one of the e1 links fails, the channel is still on, but at a reduced speed (automatic rate fallback). it provides immediate connection upon installation and easy maintenance features: ¨ª low-cost ethernet extension and converter ¨ª transparent transport of lan (10m/100m interface) traffic over 1-4 unframed e1 links ¨ª full compliance with ieee 802.3 and mii interface standard ¨ª network interface: 10 base-t/100 base-t, half/full duplex mode ¨ª transparent transport of super long frame per ieee 802.1q ¨ª data rates from 1.920mbps to 7.680mbps with automatic fallback and vlan support ¨ª built-in dynamic mac address lan table (1024), filtering function of local data frame ¨ª lan data frame fcs checking with alarm, built-in sdram controller ¨ª selectable buffer size for different application needs ¨ª high jitter tolerance level of up to 512ui for added reliability ¨ª comprehensive alarm indicators ¨ª compliance with itu-t g.703, g.704, g.823, timeslot assignment not supported ¨ª supports both hdb3/nrz coding ¨ª built-in bert and loopback test function for 1-4 e1 links with automatic rate fallback ¨ª remote terminal reset from local terminal ¨ª 220vac or -48vdc power supply specifications line interface standard itu-t g.703, g.704 line type bnc 75 ohm coaxial cable line code hdb3 (1920 k bit/s baud rate) or nrz framing unframed jitter tolerance standard per itu-t g..823 output jitter <0.05ui jitter tolerance up to 512ui clocking receive clock rate 1xe1 1920 k bit/s 2xe1 3840k bit/s 3xe1 5760k bit/s 4xe1 7680k bit/s e1 channels 1~4 differential delay among e1 links up to 8 ms receive voltage 0~-43 transmit high voltage 2.37v¡¾10%,75¥ø transmit low voltage 0 ¡¾ 0.1v connector bnc coax: 75¥ø for 2048k bit/s unbalanced ict 75/120 adapter for 120¥ø balanced. ethernet interface standard ieee 802.3 speed 10mbit/s or 100mbit/s operation mode full duplex/half duplex autosensing connector rj-45 mac address 1024 physical height 38 mm / 1.5 in width 300 mm / 11.7 in depth 200 mm / 7.7 in weight 1.5kg / 3.3lb power supply ac source 220 vac (¡¾10%), 50 to 60 hz, 3 va dc source -36 to -72 vdc, 3w power consumption ac: 3va dc: 3w environment operation temperature 0-50¡æc storage temperature -20~70¡é humidity up to 95%, non-condensing