A traditional communications network uses TDM based PDH and SDH/SONET technologies. Many carriers and enterprises are modernizing their TDM-based network infrastructure to IP to support increased traffic volume, speed, and benefit from the convergence of voice, data, and video. The TDM-to-IP transition minimizes overall operational costs, resources, and quickly roll out new services. Most enterprises still have a mix of TDM, and VoIP infrastructure to support a variety of customer needs.
References
https://www.gl.com/newsletter/migration-from-tdm-to-ip-networks-newsletter.html
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