This sample is in the Microsoft IAS Database Compatible log format (text file). A description of this format is found on the Microsoft site and on radiusreporting.com
"RasBox","RAS",10/22/2006,09:13:09,1,"ACME\slimjim","ACME\slimjim",,,,,,"192.168.132.45",12,,"192.168.132.45",,,,0,"CONNECT 24000",1,2,4,,0,"311 1 192.168.132.45 07/31/2006 21:35:14 749",,,,,,,,,,,,,,,,,,,,,,,,,,,,"MSRASV5.00",311,,,,
"RasBox","RAS",10/22/2006,09:13:09,3,,"ACME\slimjim",,,,,,,,,,,,,,,,,4,,36,"311 1 192.168.132.45 07/31/2006 21:35:14 749",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,"0x00453D36393120523D3020563D33",,,
"RasBox","RAS",10/22/2006,09:13:13,1,"ACME\slimjim","ACME\slimjim",,,,,,"192.168.132.45",12,,"192.168.132.45",,,,0,"CONNECT 24000",1,2,4,,0,"311 1 192.168.132.45 07/31/2006 21:35:14 750",,,,,,,,,,,,,,,,,,,,,,,,,,,,"MSRASV5.00",311,,,,
"RasBox","RAS",10/22/2006,09:13:13,3,,"ACME\slimjim",,,,,,,,,,,,,,,,,4,,36,"311 1 192.168.132.45 07/31/2006 21:35:14 750",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,"0x00453D36393120523D3020563D33",,,
"RasBox","RAS",10/22/2006,09:13:21,1,"ACME\slimjim","ACME\slimjim",,,,,,"192.168.132.45",12,,"192.168.132.45",,,,0,"CONNECT 24000",1,2,4,,0,"311 1 192.168.132.45 07/31/2006 21:35:14 751",,,,,,,,,,,,,,,,,,,,,,,,,,,,"MSRASV5.00",311,,,,
"RasBox","RAS",10/22/2006,09:13:21,3,,"ACME\slimjim",,,,,,,,,,,,,,,,,4,,36,"311 1 192.168.132.45 07/31/2006 21:35:14 751",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,"0x00453D36393120523D3020563D33",,,
"RasBox","RAS",10/22/2006,09:14:37,1,"ACME\slimjim","ACME\slimjim",,,,,,"192.168.132.45",12,,"192.168.132.45",,,,0,"CONNECT 24000",1,2,4,,0,"311 1 192.168.132.45 07/31/2006 21:35:14 752",,,,,,,,,,,,,,,,,,,,,,,,,,,,"MSRASV5.00",311,,,,
"RasBox","RAS",10/22/2006,09:14:37,1,"ACME\slimjim","ACME\slimjim",,,,,,"192.168.132.45",12,,"192.168.132.45",,,,0,"CONNECT 24000",1,2,4,,0,"311 1 192.168.132.45 07/31/2006 21:35:14 752",,,,,,,,,,,,,,,,,,,,,,,,,,,,"MSRASV5.00",311,,,,
"RasBox","RAS",10/22/2006,09:14:37,3,,"ACME\slimjim",,,,,,,,,,,,,,,,,4,,36,"311 1 192.168.132.45 07/31/2006 21:35:14 752",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,"0x00453D36393120523D3020563D33",,,
"RasBox","RAS",10/22/2006,11:57:11,1,"ACME\megaman","ACME\megaman",,,,,,"192.168.132.45",13,,"192.168.132.45",,,,0,"CONNECT 26400",1,2,4,,0,"311 1 192.168.132.45 07/31/2006 21:35:14 753",,,,,,,,,,,,,,,,,,,,,,,,,,,,"MSRASV5.00",311,,,,
"RasBox","RAS",10/22/2006,11:57:11,3,,"ACME\megaman",,,,,,,,,,,,,,,,,4,,16,"311 1 192.168.132.45 07/31/2006 21:35:14 753",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,"0x00453D36393120523D3020563D33",,,
"RasBox","RAS",10/22/2006,11:57:54,1,"ACME\megaman","acme.net/Users/megaman",,,,,,"192.168.132.45",13,,"192.168.132.45",,,,0,"CONNECT 26400",1,2,4,,0,"311 1 192.168.132.45 07/31/2006 21:35:14 754",,,,,,,,,,,,,,,,,,,,,,,,,,,,"MSRASV5.00",311,,,,
You can find information on the IAS standard log format here and here