One of the options for operators migrating away from Sonet/SDH transport is to move directly to packet-based transport using carrier-grade Layer 2/3 switches. SDH Migration to Layer 2/3 Packet Switching It was during this time that many predictions of Sonet/SDH's demise proved premature. From 2000-2010, Sonet/SDH spend was in decline, but it also benefitted from the relative immaturity of the Ethernet technologies that were developed to supplant it. During the mid-2000s, Sonet/SDH started on a relatively modest and uneven descent. The global Sonet/SDH market peaked in 2000 at $20 billion in revenue.
The end of Sonet/SDH was prematurely declared by the telecom industry so many times over the past 20 years that, when the fall of Sonet/SDH did truly commence in earnest, it went largely unnoticed and unheralded. Introduction: State of the Sonet/SDH Market
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