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336 voices sing on a chip
-- EDN, 12/7/2000
Centillium's Entropia chip for VoATM (voice-over-asynchronous-transfer-mode) applications supports AAL1 (ATM Adaptation Layer 1). Centillium based the chip on the company's Asynchronous Computing Engine architecture. The device can process as many as 336 channels of PCM with 16 msec of echo cancellation (AAL1) or 256 channels of PCM/ADPCM with 32 msec of echo cancellation (AAL2).The device supports as much as 16 Mbytes of external SDRAM; in-system programming; telephony features; oversubscription; and dynamic provisioning of codec, tail length (as large as 128 msec), and protocol, including Internet Protocol, ATM, and frame relay, on a per-channel basis. Power dissipation for the chip is 5W. Price for the 336-voice AAL1 version is $600 in volume, depending on features.
Centillium Communications, www.centillium.com. .
—by Nicholas Cravotta
