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Narad: Chip set lets cable top DSL speed

Sun, 08/12/2001 - 8:00pm
Anne Kerven

Narad Networks Inc. took on the DSL world with a new chip set that it says allows 1,000 times the capacity of DSL over existing HFC infrastructures, it announced today.

The Ultra Broadband Modem chip set enables full-duplex gigabit Ethernet transmission on the coaxial part of the HFC plant by using spectrum in the plant between 860 MHz and 2 GHz.

The approach of adapting industry-standard switched Ethernet technology to broadband HFC networks allows cable networks to send and receive the large amounts of data needed for premium services, a company spokesman says. Services can include business-grade telephony, virtual private networks, content distribution and storage area networking, while leaving existing services intact, Narad says.

The chip set is manufactured in silicon germanium, or SiGe, which is a derivative of silicon technology from IBM research, the company says. It allows performance at high radio frequencies at lower costs and was developed in six months.

Narad will use the chip set in its Broadband Access Network, part of the company's virtual fiber network. The virtual fiber solutions will undergo trials this fall.

The chips also use an ultra broadband data modulation scheme at radio frequencies between 900 MHz and 2 GHz, without affecting cable modem applications lower than 860 MHz. They also use analog signal processing techniques at gigabits-per-second speeds, while performing all modem functions in the analog area, the company says.

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