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Zarlink IMA processors achieves up to 10Mbps

Posted: 27 Sep 2002 ?? ?Print Version ?Bookmark and Share

Keywords:zarlink semiconductor? zl30226? zl30227? zl30228? inverse multiplexing for atm?

Zarlink Semiconductor has introduced three new inverse multiplexing for ATM (IMA) processors that achieve a data throughput of 10Mbps - the industry's highest serial DSL rate.

Designed to process DSL traffic over ATM networks, the 4-port ZL30226, 8-port ZL30227, and 16-port ZL30228 IMA devices allows designers to scale data rates on DSL subscriber links to individual service requirements, reaching 10Mbps. The ICs also can also support different port groupings and density requirements by linking up to six IMAs across a TDM ring.

"High-speed Internet access - which is based on DSL technology - is a strong international growth market," said Horace Lam, product line marketing manager, Zarlink Semiconductor. "However, at least six DSL standards are currently in use. Our multi-rate IMAs give designers the flexibility they need to build global DSL equipment for the different standards, services, and tariff rates used in a variety of markets."

The IMA chips perform two-way protocol conversions between cell-based ATM networks and serial TDM data streams over DSL subscriber links, with each on-chip TDM port supporting data rates of up to 2.5Mbps. A port aggregation feature enables serial data throughputs of up to 10Mbps over a single link.

A TDM ring interconnect allows up to six of the devices to operate as one, enabling the configuration of IMA groups from ports on multiple devices. On a per-chip basis, the 4-port ZL30226 supports up to four IMA groups, while the 8-port ZL30227 and 16-port ZL30228 support up to eight IMA groups.

The ports on the ZL30226/7/8 chips can also be individually configured for lower-layer ATM-to-TDM/TDM-to-ATM TC (transmission convergence) applications.

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