I believe they should be Green for FXS which provides a ringing voltage. the Red FXO provides a loop or off hook to an FXS Best Regards Roger W4RFJ _____ From: app_rpt-bounces@lists.illiana.net [mailto:app_rpt-bounces@lists.illiana.net] On Behalf Of Eric Fort Sent: Friday, September 19, 2008 5:47 PM To: Asterisk Repeater Controler Subject: [App_rpt] driving arib boards with tdm400 card Could someone please remind me if it's the red or green modules on the tdm 400 card that I need to drive an arib board. Also are these the same modules that drive pots telephones? Thanks, Eric