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Wintegra Adds Adaptive Clock Recovery to Its Multi-Service Access Hardware and Software Portfolio

Posted on: Monday, 5 June 2006, 09:00 CDT

Wintegra(TM), a leading provider of access processing semiconductors, announced today that it has added Adaptive Clock Recovery to its suite of Multi-service Access support. This proprietary algorithm enables the Wintegra PWE3 solution to meet the G.823 and G.824 Jitter and Wander masks in traffic conditions as defined by the Metro Ethernet Forum and G.8261-draft. It also meets the more stringent requirements of 3G applications. This opens new opportunities for using WinPath(TM) family products in Wireless Backhaul applications such as transport of T1/E1 (that connect NodeB/BTS to RNC/BSC) over Metro Ethernet and 2G/3G collocation.

Wintegra offers a Multi-service Access solution that supports termination of multiple protocols over T1/E1 lines. The protocols include ATM UNI, IMA, PPP, ML-PPP, FR, MFR, CES and PWE3 (TDM, ATM, HDLC). Multiple protocols can be used at the same time, over different T1/E1 interfaces. Two solution densities are available, up to 16 T1/E1 (512 DS0s channels) using only external framers and up to 336 T1/252 E1 (8064 DS0 channels) using an external FPGA (for which Wintegra provides the IP Core) and a Framer/Mapper. Once the protocols are terminated, the data can be interworked to a cell or packet back-plane or uplink, either by using switching, bridging or MPLS routing. One of the newest protocols supported in the framework of this solution is PWE3 (pseudo wire emulation edge to edge), that allows for the transport of different formats of data over packet networks. When transporting TDM data over a packet network (in most cases using draft-ietf-pwe3-satop or draft-ietf-pwe3-cesopsn), the TDM timing information is lost. If there are no external means for synchronization, the TDM clock needs to be recovered from the arrival rate of the packets that transport the TDM data. This is a particularly challenging operation, considering the low jitter/wander requirements of T1/E1 clocks and the typical behavior of packet networks that includes large packet delay variations, lost packets and re-ordered packets.

The Wintegra Adaptive Clock recovery solution meets this challenge using a proprietary algorithm that runs on its Packet Processor in Data Path Software. This solution meets the stringent requirements of G.823 and G.824 Jitter and Wander masks. The measurements were performed for network conditions defined by the Metro Ethernet Forum documents and also according to the ITU-T Recommendation G.8261 ("Timing and synchronization aspects in packet networks"). This recommendation defines the maximum network limits of jitter and wander and the minimum equipment tolerance to jitter and wander that needs to be provided at the boundary of packet networks at TDM interfaces. For a test report, contact Wintegra.

The solution also meets the more restrictive requirements of TS-25.402 (Testing Synchronization in UMTS networks) which makes it well suited for 3G (and 2G) wireless applications.

About Wintegra, Inc.

Wintegra is a leading provider of access processing semiconductors enabling the delivery of new services for the evolving communications network infrastructure. Its access processors and networking software provide the essential intelligence and upgradeability for infrastructure equipment to support the emerging networks based on the convergence of voice, video, data and wireless services. Wintegra-based solutions are available for a wide range of communication platforms such as wireless infrastructure, digital subscriber line, or DSL, Multi-service Access, voice over Internet Protocol, or VoIP, and access routers and are used by many of the leading telecom and networking equipment manufacturers worldwide. More information is available at www.wintegra.com.

Source: Business Wire

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