3Com VCX V7111 VoIP SIP Gateways User Manual 123C HAPTER 8: D IAGNOSTICSAll VCX V7111 Gateways have similar functionality except for the number ofchannels (the VCX V7111 24 FXS and 2FXS support only FXS), and all versionsare referred to collectively in this document as the VCX V7111.VCX V7111 FXS refers only to the 24FXS, 8FXS, 4FXS, and 2FXS Gateways.VCX V7111 FXO refers only to 8FXO and 4FXO Gateways.Diagnostics Overview3Com provides several diagnostic tools to enable you to identify an error condition and toprovide a solution or work around when working with VCX V7111 Gateways. LED Indication of channel activity status, data, control, and LAN status. VCX V7111 Self-Testing on hardware initialization. RS-232 Terminal Notification Messages. SysLog Event Notification Messages. Solutions to Common Problems.