Amati vs. Aware Message Board

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Technology Stocks : Amati vs. Aware

AWRE 1.870

+0.3%

Jan 29 3:37 PM EST

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To: Martin Z.K. who wrote (91)	8/25/1996 3:47:00 AM
From: Leo Van	of 221

DWMT for HFC. The ADI chip-set uses discrete wavelet multitone (DWMT) technology pioneered by Aware to obtain higher performance and greater resistance to 'ingress' noise on the upstream cable network band. Why does this matter ? One of the major difficulties with HFC is that the cable system was never intended for reliable high-speed data transmission. Cable was installed with the aim of providing a low-cost conventional (analog) broadcast TV service. As a result of the original limited performance requirements, CATV networks are very very noisy and 'difficult' communications channels. In particular they can suffer badly from very strong narrowband interference called "ingress". Ingress noise plays havoc with conventional single-carrier modulation schemes (e. g. Quadrature Amplitude Modulation [QAM] or Quadrature Phase Shift Keying [QPSK]), which-unlike DWMT-cannot avoid the noisy region. Using DWMT, the chipset can achieve higher data rates (which translates to more channels) for longer distances than other products. It uses the cable bandwidth and communications infrastructure more efficiently, and that allows the cable operators to offer more services.

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