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Centillium rolls chipset for passive optical nets

Posted: 10 Jun 2004 ?? ?Print Version ?Bookmark and Share

Keywords:centillium communications? pon protocol processor? transceiver? broadband service processor? colt processor?

Centillium Communications Inc. hopes to make up for a relatively late entry into the passive-optical-networking market by offering a more complete chipset than competitors. The company is releasing chipsets that include PON protocol processors, transceivers and a broadband service processor.

"Other vendors are only delivering a PON protocol chip," said Armando Pereira, GM of the Optical Business Unit.

Centillium has designed its Colt processor for optical line terminal designs and the Mustang for optical network unit designs.

These MIPS-based processors comply with the IEEE 802.3ah Draft 3 Ethernet PON specifications. Colt provides 802.1d bridging, configurable virtual LAN, Internet Group Management Protocol broadcast/multicast filtering and dynamic bandwidth allocation capabilities. It houses the Ethernet PON media access controller (MAC), a CAM block for address table storage and a hardware encryption engine, and also provides E2PROM, management, CPU and SRAM interfaces.

Optimized for customer-premises equipment, Mustang provides 802.1d bridging, 802.1q configurable VLAN support and IGMP multicast/broadcast filtering. It also offers on-chip serdes and clock-and-data recovery blocks, a frame buffer and two Gigabit Ethernet MAC blocks.

Complementing Colt and Mustang are the Zeus and Apollo transceivers, which can be implemented in optical modules or on a board. Apollo is a continuous-mode transceiver targeted at point-to-point optical connections.

Zeus is a burst-mode transceiver that can be used in point-to-multipoint designs. It can operate at 155Mbps or 622Mbps or at 1Gbps, thus allowing its use in Ethernet or broadband PON designs.

Finally, Centillium's Unicorn broadband service processor handles the bridging and routing of Ethernet traffic while providing a DSP block for up to four voice-over-Internet Protocol streams. It is equipped with an IPSec encryption accelerator that supports DES, 3DES and AES.

The Apollo transceiver is currently sampling. The Colt, Mustang, Unicorn and Zeus chips will start sampling during the third quarter.

- Robert Keenan

CommsDesign.com





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