SuperComm gives DSL profile boost

Digital Subscriber Line (DSL) technology got a recent boost from several major network vendors who announced progress towards high-powered, multivendor DSL infrastructures.

Cisco Systems rolled out 11 products for DSL backbone and also for customer-premise connectivity, and at SuperComm in Atlanta, 3Com and Lucent joined vendors claiming interoperability among their implementations of the high-speed remote-access technology.

Competitive service providers are creating DSL services that could provide multimegabit connectivity for telecommuters and branch offices at prices far below the cost of a traditional T1 leased line.

The products recently introduced by Cisco span the network from the service-provider central office to the customer site. They are designed to allow for a broader range of service offerings, as well as a greater density of connections for more cost-effective service.

The company rolled out the Cisco 6130 and 6260 DSL Access Concentrators which target service-provider facilities as well as three line cards that will add Synchronous DSL (SDSL) and G.Lite-standard capabilities to Cisco DSL concentrators. For the Cisco 6400 Universal Access Concentrator, the company unveiled an OC-12 (622Mbit/sec) interface. SDSL lets end users send data at the same rate as they receive it from the WAN.

Cisco also introduced additional devices to bring DSL into customer sites. The solutions include the Cisco 633 Series SDSL Data Service Unit, the 673 SOHO/Telecommuter SDSL router, the Cisco 627 ATM-25 ADSL Modem, the company's Cisco 677 SOHO/Telecommuter ADSL Router, and the Cisco 1417 Ethernet to ADSL Router.

G.Lite capability on the DSL concentrators will allow the devices to work with an International Telecommunications Union standard for DSL transmission while at the same time supporting other types of transmission.

Two major vendors announced at SuperComm that their G.Lite equipment will work with solutions from a variety of other vendors. In a booth at SuperComm, 3Com and Lucent both demonstrated equipment communicating with DSL access multiplexers (DSLAMs) and other equipment from Nortel Networks, Newbridge, and several other vendors. The devices are based on platforms from Alcatel, Globespan, PairGain, Texas Instruments, and Analog Devices.

The G.Lite specification, which will support connections roughly at T1 speed (1.5Mbit/sec) over typical phone lines, is expected to be approved this summer.

The demonstration was organised by the Universal ADSL Working Group (AUWG) , a group organised last year to promote interoperability of G.Lite products. The AUWG announced that following the show, it will transition its work to the ADSL Forum.

3Com recently demonstrated customer premises equipment in its booth at Supercomm. The company plans to ship its new G.Lite-compliant ADSL modems in its HomeConnect line this month. Lucent is showing interoperability of devices using its WildFire DSP1690 modem chip set.

Cisco Systems, in California, is at 3Com, in California, is at Lucent Technologies, in New Jersey, is at

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