LAS VEGAS -- WAN-emulation vendors this week will unveil updates to their testing tools that promise to give network managers more insight into how applications will perform under real-world conditions across the wide area.

Apposite Technologies and Shunra will separately unveil upgrades to their technologies that let network managers test applications against conditions that may be present on the WAN. For instance, Apposite Technologies' Linktropy appliances can act as a WAN infrastructure to let network managers determine how application traffic will react to various bandwidth constraints, packet loss and other WAN parameters.

This week at Interop the company plans to introduce its Linktropy 1700 and Linktropy 7500 Pro appliances capable of simulating WAN links of as much as 1 Gigabit/sec at full line rate. The Ethernet-based WAN emulator appliances plug into the network as bridges or routers connecting two local network segments, with network equipment and applications installed on either side of the emulator. Network managers then configure the emulator to simulate WAN conditions and watch how the application traffic performs under the conditions.

The Linktropy 7500 can capture traffic on a single Gigabit link, and the 7500 Pro can perform WAN emulation on as much as four aggregate links with a total throughput of 4 Gigabit/sec. The appliances are 1U-sized, rack-mountable chassis and include copper and modular fiber/copper Gigabit Ethernet interfaces to integrate into any test networks, says DC Paltor, president of Apposite.

"The idea is to make WAN emulation very simple. Customers buy a box, and there is no other hardware or software to install," he says. "The appliance can run the gamut of helping developers in the application design phase to troubleshooting performance problems to optimizing applications after they have been rolled out."

Scheduled to be available in mid-June, the Linktropy 7500 and 7500 Pro are priced between $7,500 and $20,000, depending on the WAN bandwidth.

For its part, Shunra also this week at Interop is making available an updated version of its Shunra VE (Virtual Enterprise) appliance, which can now measure voice quality, provide playback of voice conversations and craft a SIP conversation diagram for troubleshooting purposes.

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