The TXP2000 family of PCIe plug-in cards provide media processing acceleration for use in standard server architectures or appliances. The TXP2000 cards use Octasic’s OCT2224M Digital Signal Processors (DSPs) and Octasic’s Vocallo MGW media processing suite to provide an easy to use and low power accelerator card in a PCI Express form factor. A single TXP2000 card can replace one or more servers. With models supporting between 4 and 12 DSPs, the TXP2000 can be matched to the required level of performance.
The TXP2000 cards provide the highest density H.264, MPEG4, H.263 video CODEC, and G.711, G.729, AMR voice CODEC transcoding density per watt in the industry. Furthermore, the standard functionality is also extended to provide video and voice quality processing features such as video scaling, mixing & keying, as well as voice echo cancellation, conferencing and adaptive noise reduction.


  • Up to 7680 channels of G.729AB – G.711 transcoding
  • Up to 24 simultaneous H.264 HD -> SD transcodes
  • PCI Express Long Card

– Full Height (106mm) x Full Length (311mm), single slot width

– PCIe X4 Gen 2 Electrical Connection

  • External Ethernet Ports

– 2 x Gigabit Ethernet 1000BASE-T RJ45

– Network Address Translation function presents card as single IP address (up to 1Gbit/s)

  • Internal Ethernet Infrastructure Capacity

– 2 x 1Gbit/s to host via PCI Ethernet controller

– 2 x 1Gbit/s to each DSP

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Hardware Diagram

The TXP2000 is based on Octasic’s OCT2224M DSPs. Each DSP is fitted with its private external memory and operates autonomously. This pool of DSPs is controlled from a host application running on the server or remotely. The internal data flows of the board are all based on Gigabit Ethernet connections with all DSPs accessible via a local Ethernet switching subsystem. Host access to all the DSPs is via a standard PCI connected Ethernet controller. The Ethernet switching subsystem supports two links to each DSP to support 1080p video conferencing functions.

Standard configurations include a choice of 4 and 8 DSPs but for enclosures with additional power and cooling capability, a 12 DSP variant is available. An additional power connector can be used to supplement standard PCIe power provision.

Principal media flows can be routed via the host CPU or via two external Gigabit Ethernet ports provided for direct traffic termination. In this configuration, packets for transcode can bypass the host computer entirely while a special Network Address Translation (NAT) device makes the board appear as a single IP address to external networks.


A comprehensive host Application Programmers Interface (Vocallo API) is provided. This is used to configure and execute voice and video stream processing functions. The API commands communicate directly with the DSP array based on an endpoint and stream resource model. A non-blocking command/response protocol aids multi-channel programming efficiency. Find out more about Vocallo MGW!

Typical Applications

  • Session Border Controller
  • Carrier Class Media Gateway
  • Media Servers / Media Resource Function
  • Mobile Video Optimization (transcoding and transrating)
  • Video conferencing Server (MCU)
  • Interactive Voice and Video Response System