To: Tim McCormick who wrote (2959 ) 3/18/1998 1:04:00 AM From: Scrapps Respond to of 9236
Nortel's DSL technology to diminish crosstalk By Carmen Nobel, PC Week Online 03.17.98 6:00 pm ET Northern Telecom Ltd. next week will announce a digital subscriber line technology that cuts down on the problem of crosstalk among copper wire binder groups. The DSL technology is called EtherLoop because it works much the way an Ethernet LAN does, treating a binder group as if it's a shared medium, according to Nortel officials in Toronto. "This is basically Ethernet over copper wires," said Scott Ryan, senior marketing manager at Nortel. Instead of maintaining constant, full-power streams of data the way most DSL technology does, EtherLoop sends packets of data out in high-speed bursts. The bursts are unlikely to run into each other, making the problem of crosstalk in the binder group unlikely, officials said. Having several connections on the same binder group therefore will not hinder the speed the way asymmetric DSL sometimes does. EtherLoop data has traveled as fast as 10M bps, officials said, although speed depends on distance as well as other interference problems such as bridge taps. The technology averages about 5M bps both ways at a distance of 6,000 feet, officials said. Nortel will be selling both head-end equipment and client-side modems that support the EtherLoop technology. Pricing and availability have yet to be announced. Separately, Nortel announced this week that its Micom division shipped 10,000 voice/fax channels for the company's V/IP Phone/Fax IP Gateway in 1997. The V/IP Phone/Fax gateway enables users to make phone calls and send faxes over an IP network. Nortel can be reached at www.nortel.com. Micom, in Simi Valley, Calif., is at www.micom.com.