Trinity, ARM shake on soft modem
By Robert Keenan , EE Times
May 20, 2004
URL: eetimes.com
Wayne, N.J. - ARM Ltd. is porting Trinity Convergence Inc.'s VeriCall Edge software to the ARM926EJ-S microprocessor core, supporting Trinity's efforts to make the voice-over-Internet Protocol soft-modem architecture a viable alternative to DSP-based solutions.
As cable and telephony providers rush to deliver VoIP to home customers, equipment vendors are looking to reduce the cost of customer-premises equipment (CPE). Taking a page from the 56k modem playbook, Trinity is offering a soft VoIP modem architecture that can run on a general-purpose processor, such as an ARM core. This approach lowers costs by reducing the size and power required in a DSP-based solution, Trinity said.
"The analog-modem market moved away from having dedicated DSP," said Mike Felice, co-founder and vice president of sales and marketing at Trinity (www.trinityconvergence.com). "We're taking the same model and bringing it into the residential VoIP space."
The media-processing block in Trinity's VeriCall Edge soft modem delivers a speech algorithm library, a telephony library and a library for third-party software. The modem also includes a device manager interface for audio and packet connections, a packet handler that provides quality-of-service and framing techniques, an echo canceler library and an SIP stack for call control. Third-party or customer-specific software can be added through an open application programming interface, Felice said.
Designers can eliminate a DSP from their design by implementing these capabilities in software, Felice said, leading to what the company said was a $3 to $8 saving in bill-of-materials costs. This approach also reduces overall power consumption by 200 to 250 milliwatts, critical in applications such as voice-over-wireless LAN, Felice said.
But the success of the VeriCall Edge architecture will rest on Trinity's close links to strong general-purpose processors like ARM's. The ARM9E is quickly becoming a de facto processor in residential CPE designs, Trinity said.
The ARM926EJ-S includes signal-processing extensions to enhance 16-bit fixed-point performance using a single-cycle 32 x 16 multiply-accumulate unit. It also implements ARM's 16-bit Thumb instruction set. The processor includes ARM's Jazelle technology, which enables the direct execution of Java byte codes in hardware.
Trinity will initially deliver a version of its VeriCall software for the ARM9 processor that runs on Linux. It plans future versions that will support VxWorks, Symbian and Microsoft CE .Net. |
