TI tech ups upstream capacity by 50 percent

Wed, 05/02/2001 - 8:00pm
Anne Kerven

Texas Instruments Inc. launched an advanced TDMA technology that enables a 50-percent increase in upstream cable plant capacity, TI reports.

Two chips — a dual-channel receiver at the headend and a "newly certified device" at the customer location — combined with the company's increased capacity ingress cancellation technology, allow three times the upstream bandwidth per channel. In turn, MSOs can provide symmetric services, such as voice, multisession videoconferencing and peer-to-peer networking.

The technology is designed to take the present upload/download disparity — some 30 Mbps to 40 Mbps on downloads and 5 Mbps to 10 Mbps uploads — and even it out by increasing uploads to 30 Mbps.

Advanced TDMA is an evolution of DOCSIS and the two are fully compatible and operate at the same RF channel, TI says. Enhancements include spectrally efficient constellations of up to 64 quadrature amplitude modulation increasing upstream capacity by 50 percent; improved Reed-Solomon forward error correction for impulse and burst noise; and higher baud rates.


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