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Zarlink packet processors transport TDM via Ethernet

Posted: 18 Oct 2002 ?? ?Print Version ?Bookmark and Share

Keywords:zarlink semiconductor? mt90880? mt90881? mt90882? mt90883?

Zarlink Semiconductor has announced the availability of the MT90880/1/2/3 packet processors that support scaleable, low-cost Ethernet backplanes and are able to transport high volumes of TDM access services, such as T1/E1 leased lines, with the same quality as more expensive TDM networks.

The devices allow operators to route T1/E1 traffic across Ethernet MANs or WANs, thus eliminating costly TDM trunks while extending investments in installed TDM access infrastructure.

The packet processors set up, synchronize, time, and manage TDM-over-packet connections from end-to-end, enabling low-cost IP/Ethernet networks to achieve carrier-class, TDM-like service quality. Synchronization is also improved by an on-chip, digital PLL circuitry that meets the requirements of Telcordia's GR-1244-CORE standard for Stratum 4E clocks.

Packet processing latency is also measured at 125?s for the processors, regardless of channel density, compared to the 2ms measured on microprocessors.

The MT90881 and MT90883 are designed for CESoP applications in next-generation access equipment such as GbE service routers and broadband aggregation platforms. The MT90881 converts up to 32 T1/E1 streams, or 1,024 TDM channels, in Nx64Kbps configurations to Ethernet/IP packets, while the MT90883 converts eight T1/E1 streams or 256 channels.

The MT90880 and MT90882 are tailored for TDM backplane replacement in telephone switches, multiservice access platforms, and VoIP gateways. Both devices feature on-board, non-blocking TDM switches and route incoming traffic either directly to packetization circuitry, or through a local TDM interface to resource pools.

The MT90880 incorporates a 1,024x1,024-channel switch that supports 32 streams of Nx64Kbps TDM traffic, while the MT90882 has a 256x256-channel switch that supports eight streams of Nx64Kbps.

The TDM interfaces on all four chips accept traffic at rates of 2.048Mbps or 8.192Mbps. The packet switch interfaces are dual redundant MIIs operating at 100Mbps.

Manufactured using a 0.18?m CMOS process, the pin-compatible devices are available in 456-pin BGA package with a 27-by-27mm footprint. In 1,000 quantities, the MT90880 is priced at $209, the MT90881 at $165, the MT90882 at $156, and the MT90883 at $135.

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