OTTAWA -- Zarlink Semiconductor Inc. today claimed it has produced prototype samples of the industry's first DMT-based data transceiver that's fully compliant with international standards for four-band, 12-MHz very-high-bit-rate DSL communications.
The Canadian chip supplier said the discrete multitone transceiver will boost the efficiency of modems for very-high-bit rate digital subscriber line (VDSL) communications used in broadband services, such as multiple data, video, and voice channels, plus Internet access, to homes and businesses. VDSL is an industry standard aimed at symmetrical transmissions (same speed in both directions) of high-bandwidth services up to 52-megabits per second over short distances using standard copper telephone lines.
Zarlink--the semiconductor spin-off from Mitel Corp.--said real-world conditions, noise, and other line interference can degrade signal integrity, reducing the speed and distance of VDSL transmissions. To address this problem, Zarlink said it has developed a DMT modulation technology to dynamically configure the transmitted signal for a range of line conditions. The company said this capability will eliminate transmission errors and provide higher data rates over longer distances.
"The industry recognizes that VDSL modems designed with DMT transceivers will deliver significantly improved speed and distance performance compared to modems using today's transitional technology," said Andrew Faulkner, product manager for VDSL at Zarlink in Ottawa. "To meet this need, we're developing a flexible, interoperable single-chip DMT data transceiver that will ease the design of full-rate, VDSL-compliant modems for customer premises and central office applications."
Zarlink said its new DM-based transceiver chip fully supports either the two-, three-, or four-band approaches specified in the VDSL standards. The transceiver uses FEC (forward error correction) techniques, including Reed Solomon with interleaving, to ensure robust data transfer rates, said the company.
The new DMT transceiver can be configured to meet all specified band plans (997, 998 and FX), according to Zarlink. The DMT technology will enable VDSL services to easily co-exist with other services in the "binder group," including asynchronous DSL (ADSL), ISDN (integrated services digital network), and POTS (plain old telephone service), said Zarlink.
Early samples of the DMT transceiver are being sent to Zarlink's alpha-site customers. The company is willing to send advanced documentation on the product with a non-disclosure agreement. No pricing information was released.