News Release from: Zarlink Semiconductor
Edited by the Electronicstalk Editorial Team on 30 September 2002
Multiplexers have all DSL datarates covered
Zarlink Semiconductor has launched three highly reliable inverse multiplexing for ATM processing chips that achieve data throughput of 10Mbit/s - the industry's highest serial DSL rate.
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Zarlink Semiconductor has launched three highly reliable IMA (inverse multiplexing for ATM) processing chips that achieve data throughput of 10Mbit/s - the industry's highest serial DSL rate. Zarlink's new IMA chips cost-effectively support an extensive range of DSL services by combining industry-leading ATM-to-TDM (time-division multiplex) throughput rates with flexible, per-port bandwidth provisioning options. Designers are demanding multirate, versatile IMAs that can reliably process DSL traffic over ATM networks, while supporting the wide array of service rates, tariff options, and access aggregation requirements in global DSL markets.
With Zarlink's four-port ZL30226, eight-port ZL30227 and 16-port ZL30228 IMA devices, designers can scale datarates on DSL subscriber links to individual service requirements, reaching 10Mbit/s.
Different port groupings and density requirements can be supported by linking up to six IMAs across a TDM ring.
Zarlink's IMA technology recently passed rigorous IMA compliance tests at the InterOperability Lab of the University of New Hampshire's Research Computing Centre, a world-class, independent ATM test facility.
The devices have also passed interoperability tests with G.SHDSL chips from two leading DSL vendors.
G.SHDSL, which stands for G.991.2 single-pair high-bitrate DSL, is the ITU-T's global standard for high-speed DSL.
Customers are now evaluating Zarlink's IMAs for use in multiservice access platforms, access multiplexers, digital loop carriers, and integrated access devices.
"High-speed Internet access - which is based on DSL technology - is a strong international growth market", said Horace Lam, product line manager, Zarlink Semiconductor.
"However, at least six DSL standards are currently in use.
Our multirate 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".
Zarlink's new ZL30226/7/8 IMA chips perform two-way protocol conversions between cell-based ATM networks and serial TDM data streams over DSL subscriber links.
Each on-chip TDM port supports datarates of up to 2.5Mbit/s, and a unique port aggregation feature enables serial data throughputs of up to 10Mbit/s over a single link.
The ZL30226/7/8 also offer flexible support for a broad range of port density and IMA grouping requirements.
The IMAs are pin-to-pin compatible, allowing designers to use the same DSL line card architecture to address different density requirements with simple device change-outs.
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 four-port ZL30226 supports up to four IMA groups, whereas the eight-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.
The University of New Hampshire's InterOperability Lab evaluated the core IMA circuitry in Zarlink's IMA chips in different end-to-end configurations while interconnected to ATM switches from three leading vendors.
The IMA circuitry passed 23 separate tests, confirming full compliance with the ATM Forum's IMA 1.1 standard.
Zarlink's IMA chips are also compatible with the ATM Forum's IMA 1.0 and UNI specifications.
Zarlink's new IMA chips are now in volume production.
The devices are offered in pin-to-pin compatible, 384-ball PBGA (plastic ball grid array) packages and supported by DSL reference designs and software.
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