MSP BRI 2-24-Line PCM Interface

The MSP-BRI PCM interface is a general-purpose ISDN Basic Rate interface for host-based telephony media processing. It allows the BladeWare OEM to address markets where BRI is prevalent in office environments.

One ISDN Basic Rate Interface (BRI) supports two independent telephone channels. Using digital encoding, BRI is carried over a single twisted pair between the telephone end office to the customer premises, where the two-wire signal (the U interface) is converted to a four-wire signal (the S/T interface) by a network-termination device called an NT-1. The MSP-BRI interfaces with the four-wire S/T interface, deriving the two telephone channels, called bearer channels, and one 16-Kbit signaling channel, called a D-channel, and implements the ISDN protocols to give fast detailed call control .

The MSP-BRI is a half-height PCI or PCI Express board with 2, 4, 6… to 24 BRI lines/ports using one expansion-card slot. Each individual card has up to three dual BRI daughtercards to provide six basic-rate interfaces or 12 telephhone lines. Up to four boards can be interconnected on a “micro backplane” to expand the assembly to 24 basic-rate interfaces.

A daughtercard can assume either the NT (network termination) or TE (terminal equipment) function, depending on how it is inserted into the main board. To change modes, simply unplug the daughtercard, turn it over, and re-insert it. This feature allows the implementation the ISDN equivalent of station and office trunks.

The MSP-BRI is also available with Commetrex’ optional OpenMedia media-processing software environment.

OpenMedia is a comprehensive multi-stream software environment that permits the user to efficiently develop host-based signal-processing functions.


  • Supported by BladeWare
  • 2 to 24 basic-rate lines supported
  • 2U form factor (120 mmx55 mm)
  • Autosense with 5 and 3.3 volt busses
  • PCI 2.2 compliant
  • RJ-11 cables included
  • 32-bit bus master for 132 Mbytes/sec
  • Temp range of 0-50 C
  • Linux support
  • OpenMedia streams framework
  • Software-defined media


  • Flexible deployment
  • Multiple media per board
  • Ultra-low distortion, low-noise data
  • Productive development
  • Improved strategic options
  • Configuration flexibility
  • Broad market coverage
  • Support for high-speed modems
  • Easily develop proprietary media processing technologies


FCC Part 15 Class A, FCC Part 68, CE, TBR3.

Related Publications

  • MSP-FX S/O Product Bulletin
  • MSP-H E/T Product Bulletin
  • OpenMedia SDK Product Bulletin
  • BladeWare HMP Product Bulletin
  • PowerFax for BladeWare Product Bulletin


Compatibility PCI 2.2 and PCI Express
Warranty Lifetime
PCI Bus 32-bit bus master DMA at 132-Mbytes/sec.
Form factor 2U 120 mm x 55 mm
Initialization PCI Plug-and-Play
Connectors Four, RJ-11 for telco lines per end plate (up to six end plates)
Processor FPGA
Power 0.8 amp peak, 300 MA operational at 3.3 or 5 volts (autosense)
Temp Range 0-50 C
Cables Shipped with RJ45-terminated splitter cables (2 BRI/end-plate connector
BRI Interfaces Two S/T BRI interfaces per daughtercard
Operating System Linux