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Processor eases shift from TDM to VoIP MSANs

Posted: 25 Jan 2008 ?? ?Print Version ?Bookmark and Share

Keywords:VoIP? processors? MSAN?

Mindspeed Technologies Inc. has introduced a family of highly-integrated VoIP processors that enable the migration of copper loop voice access networks from traditional Class-5 time-division multiplexing (TDM) equipment to next-generation VoIP multiservice access nodes (MSANs).

The Comcerto 300 Series combines the company's SoC architecture and carrier-class software, enabling equipment manufacturers to efficiently develop VoIP-to-Ethernet line cards for MSANs, Ethernet/IP-enabled digital subscriber line access multiplexors (IP-DSLAMs) and next-generation digital loop carriers (DLCs).

The access processors integrate a complete media access gateway in a single device by combining signaling and control processing, packet processing and a set of interfaces and features. By enabling "VoIP on a line card", the devices reduce system complexity and leverage the Ethernet-based access equipment architectures that already support xDSL termination line cards. The device family is also well suited for IP-PBX applications.

Processing power
The Comcerto 300 Series device architecture incorporates two separate ARM11 processor cores and a DSP array coupled through a shared memory subsystem to simultaneously provide real-time, low-latency media processing, as well as call control and call setup functions. One ARM11 is dedicated to media stream packet processing, while the second ARM11 is dedicated to the signaling, call-control and board management functions. This functional division simplifies software development, said Mindspeed.

Dual-independent Gigabit Ethernet interfaces with integrated Serdes offer a set of configuration options including sGMII supporting direct backplane connectivity for high availability, high-reliability MSAN and IP-DSLAM architectures using "dual-star" Ethernet switch fabric architectures. The device also provides the ability to generate TDM clocks, which are frequency-synchronized to a TDM network-generated packet stream.

The VoIP processors are designed to support narrowband plain-old telephone service (POTS) line cards from 24 to more than 150 channels including echo cancellation, tone detection and other narrowband copper loop telephony features. Dual SPI, I?C, two UARTs, 32 GPIOs and an expansion bus connect to a wide array of devices.

Evaluate it
A design kit is available, which includes a silicon support package software bundle (SiSP) for both VxWorks and Linux. An evaluation module provides all necessary memory, a TSI, four FXS POTS lines, one FXO trunk line, two 10/100/1000BaseT Ethernet interfaces (with SFP option for optical connectivity), and a T1/E1 interface. The EVM also includes a system expansion connector designed to mate with Zarlink Semiconductor's Legerity SLIC/SLAC EVMs, allowing customers to configure VoIP-enabled POTS systems from 8 to 72 ports.

Pricing ranges between $36 and $99 per unit in OEM quantities. M823xx devices are available in five performance levels and two packaging options (RoHS/standard). Packaged in a 23mm x 23mm x 1mm BGA, volume production is scheduled in Q3 2008. Samples are already available.

- Gina Roos

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