TECHNICALREFERENCE8-3Top-of-the-Case Lights (Voice Faxmodem Pro Externals)LightWhat It Means When LightedPOWER ....................The modem is turned on.SEND........................The computer is sending a data bit to the modem.RECEIVE..................The modem is sending result codes or passing received data bits from the remote.ONLINE....................The modem is online. (NOTE: This light blinks when the mute feature is being used.)