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Datacom products come together at plugfest

Martin Rowe, Senior Technical Editor -- Test & Measurement World, 5/1/2003

Data communications products are useless if they don't communicate with other products designed to meet the same standard. To help designers verify interoperability among like products, organizations run "plugfests," where companies can test their offerings against numerous other products. From a plugfest, engineers learn where their designs need improvement.

UNH students Matthew Plante (top) and Mike Henninger test a XAUI interface.

Trade organizations and universities often sponsor plugfests. For example, the University of New Hampshire (Durham, NH) runs plugfests, which it calls "group test periods," at its interoperability lab (IOL). The IOL's consortium members, subdivided into groups that handle different communications technologies, support the lab and regularly attend plugfests. The IOL subdivisions include ADSL, cable modem, Fast Ethernet, Fibre Channel, IEEE 802.11a/b/g Wireless, and 10 Gigabit Ethernet (10GBE).

Earlier this year, the IOL's 10GBE Consortium held a plugfest for makers of 10-Gbits/s optical and electrical components. Engineers and students tested the physical signaling and coding characteristics of 10-Gbits/s attachment unit interface (XAUI) devices and verified overall device interoperability. XAUI devices, used for chip-to-chip and board-to-board communications, use four 3.125-Gbits/s channels to deliver 10-Gbits/s of data. Products tested at the plugfest included ICs, connectors, backplanes, cables, and test equipment.

A SmartBits data generator from Spirent Communications connects to a test band for an interoperability test.

IC makers such as Broadcom and Xilinx tested for interoperability with each other's devices in concert with various combinations of backplanes, connectors, and cables. Participants identified two defects in IEEE 802.3ae standard. Amir Bar-Niv of Mysticom (Netanya, Israel) found a flaw in how the standard defines XAUI state machines. Another defect concerned the physical channel that XAUI devices use to communicate. The IOL staff will notify the IEEE about the defects.

Interoperability tests increase a manufacturer's confidence that a design will work when connected to numerous other devices. "Member companies come to plugfests to find where their products need improvement" says the lab's 10GEC manager, Bob Noseworthy. "Companies bring products that they've already tested in-house; then they come here to get access to a wide range of other products."

If your company manufactures data-communications products, then the IOL can help you debug your new products. Between plugfests, IOL engineers often work with individual consortium members to debug designs. The lab has many test benches and lots of equipment, often more than any single company will have. So, members bring their products to the IOL for one-on-one testing before attending a plugfest. To learn more about the University of New Hampshire Interoperability Lab and its services, visit the lab's Web site at www.iol.unh.edu.

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