Packet Processors Enhance Voice Quality Over IP Networks

Promising to boost voice quality over IP networks, the MT90880/1/2/3 packet processors are touted as the industry's first devices to achieve high-density circuit emulation services over packet (CESoP) for TDM. The devices are also said to be the first purpose-built packet processors to support scaleable, low-cost Ethernet backplanes. The MT90881 and MT90883 target CESoP applications in next-generation access equipment. The MT90881 converts up to 32 T1/E1 streams or 1,024 TDM channels in N x 64 Kb/s configurations to Ethernet and IP packets. The MT90883 converts eight T1/E1 streams or 256 channels. The MT90880 and MT90882 are designed for TDM backplane replacement and feature on-board, non-locking TDM switches. The switches route incoming traffic either directly to packetization circuitry or through a local TDM interface. The MT90880 employs a 1,024 x 1,024-channel switch that supports 32 streams of N x 64 Kb/s TDM traffic. The MT90882 has a 256 x 256-channel switch that supports eight streams of N x 64 Kb/s. The TDM interfaces on all four chips accept traffic at rates of 2.048 Mb/s or 8.192 Mb/s. The packet switch interfaces are dual redundant media independent interfaces operating at 100 Mb/s. The chips are also pin-to-pin compatible, allowing the same architecture to be used for both low- and high-density access equipment. The MT90880, MT90881, MT90882 and MT90883 are priced at $209, $165, $156 and $135, respectively, each/1,000. ZARLINK SEMICONDUCTOR, Ottawa, Canada. (613) 270-7115.