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Technology Stocks : Voice-on-the-net (VON), VoIP, Internet (IP) Telephony
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To: Stephen B. Temple who wrote (1640)10/21/1998 10:24:00 PM
From: Stephen B. Temple  Read Replies (2) of 3178
 
How about a little EtherLoop> Elastic shows how compatible DSL can be

By Tim Greene
Network World Fusion, 10/21/98

Atlanta - Elastic Networks yesterday announced at NetWorld+Interop that its digital subscriber line (DSL) technology will not disrupt voice and data services traveling along adjacent wires in the same telco wiring cable.

Computer simulations performed by Bellcore indicate that the DSL technology, called EtherLoop, can coexist peacefully with voice service, ISDN, high-bit-rate DSL (HDSL), T-1 and asymmetric DSL (ADSL). Testing in labs and cable farms will be completed by year-end, according to Elastic.

Noise among different services poses a problem to carriers that want to offer DSL services. Local carriers that own the actual copper phone lines must carefully select which copper loops to sell to DSL providers to ensure the DSL services do not disrupt other services the local carrier is selling.

EtherLoop is a high-bandwidth data technology that runs on a regular phone line at up to 10M bit/sec over a 3,000-foot line. That speed drops off to 750K bit/sec over a 21,000-foot line. A regular voice phone call can be made simultaneously on the same line with Etherloop.

Those factors are similar to DSL. But EtherLoop differs in that it sends no signal when there is no data to send. Therefore, it is silent much of the time. During quiet periods, EtherLoop modems send test packets to determine what other services are being provided on wires around it, and they adjust their transmission frequencies to avoid interfering with whatever those services are, Elastic says.
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