TDM400P Base Board. The Digium TDM400P takes the place of an expensive channel bank and brings the system price point to a low level. By using FXO and FXS modules with the TDM400P, one can create a solution with support for a range of telephones. To scale this solution, simply add additional TDM400P cards populated with modules. The Wildcard TDM400P is a half-length PCI 2.2 compliant card that supports from one to four telephone interfaces for connecting analog telephones or analog lines to a PC. Using Digium's Asterisk™ PBX software and standard PC hardware, one can create a SOHO (Small Office Home Office) telephony environment that includes all the sophisticated features of a high-end business telephone system. The TDM400P takes the place of an expensive channel bank and brings the system price point to a low level. By using FXO and FXS modules with the TDM400P, one can create a solution with support for a range of telephones. To scale this solution, simply add additional TDM400P cards populated with modules.