Frame relay won in the WAN over ATM, which proved too expensive despite its good points, such as five levels of QoS. Now MPLS is pushing aside both. The debate about frame relay vs. ATM as WAN ...
Erin Dunne, director of research at Vertical Systems Group, says companies migrating from frame relay and ATM are moving to Ethernet faster than those using private lines, including T-1s and higher.
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