The PMC form-factor is the standard for adding modular functionality to PCI, cPCI, or VME boards. At about 4" x 6", PMC boards are small, compact, and comply with the popular and widespread PMC mechanical form-factor and local PCI bus electrical interface. In many cases, PMC boards use completely surface mount components, including connectors, and have components on both sides of the board, to increase performance density.

The PTMC standard is a PMC-variant, with the "T" meaning Telecom. PTMC boards adhere to the same mechanical form-factor as PMC, but add local TDM and Utopia bus interfaces to the local PCI interface, to increase compatibility and support for telecom and voice-over-packet applications.

For applications demanding DSP and telecom in a small footprint, the SigXXX-PMC series of boards makes it possible. The PMC boards listed below are fully supported by DirectDSP® software, which offers programming interface to C/C++ programs running under Linux and WinXP.