... transparent/ fractional E1 channel; others support transparent E1 channelProvide 10/100M electrical Ethernet port, 100/1000M optical Ethernet port1E1 ... devices support bandwidth couple, loop test and two clock resources, etc; others support loop test, CRC selection, etc.4/8 ... : 20~90%Store Temperature: -20~65Store Relative Humidity: 10~95%Order Information P/N DescriptionF5-4518A 100/1000M optical ...