Dynarc Brings Quality Control to MANs

When carriers offer performance guarantees for IP services, users typically have to take them on trust. The guarantees are based on their networks being engineered appropriately, and there's no way of checking whether this will be the case in practice.

Swedish startup Dynarc AB http://www.dynarc.com says it can help carriers do better than that. Its new Dynarc 50 access switch enables operators to offer quality of service guarantees that will really stick. Specifically, it will enable carriers to eliminate the risk of congestion in their metropolitan area networks so that transit delays are predictable and low - just the ticket for carrying traffic comprising a growing amount of voice and video.

Dynarc eliminates the risk of congestion by using Dynamic synchronous Transfer Mode (DTM), a new form of circuit switching. It works like the ordinary telephone network in that users can only set up circuits across the backbone if there's sufficient capacity to do so. The big difference is that the circuits can be very high bandwidth, up to 1 Gigabit/s in 512 kbit/s increments, and can be set up in a matter of milliseconds.

Dynarc says the technology not only guarantees quality of service but also supports multicasting - a key issue for distributing video. The Dynarc 50 can work directly over fiber, or can be used with wavelengths generated by DWDM (dense wave division multiplexing) equipment. There's no need for expensive Sonet (synchronous optical network) equipment, it says.

The vendor has an existing switch, the Dynarc 300, that enables carriers to connect their MANs to existing Sonet backbones. "Our customers often move from MAN to regional connectivity and want to connect to other carriers," says Per Lembre, product manager for Dynarc. The combination of Dynarc 50 and 300 lets them do this "without breaking the bank," he says.

The starting price for the Dynarc 50 is $7,000 for the basic Dynarc 50 chassis with four ports and a DTM interface. It's installed alongside legacy data equipment, such as Ethernet switches or routers, which means it can be used to upgrade legacy data nets with quality of service smarts.

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