Convergence Switching and the Next-Generation Carrier

Shrinking traditional telephony revenues and

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Unformatted text preview: vices. Shrinking traditional telephony revenues and profitability will force carriers to do the following: • reduce the number of overlay network platforms; currently, most carriers operate separate circuit-switched (voice and private line), frame relay or asynchronous transfer mode (ATM), and Internet protocol (IP) networks • cap investment in traditional circuit switches and migrate to a converged switching infrastructure • provide more profitable, enhanced services from hardware and software platforms designed to deliver integrated telephony-grade voice, video, and data services The challenges presented by the shift from voice to data dominance will affect the profitability and long-term viability of carriers of all stripes, from incumbents to recent market entrants. Determining and implementing a sound migration strategy from today’s overlay networks to an integrated circuit- and packetswitched architecture is, therefore, critical to the future of all telecommunications carriers. 2. Voice and Data—The History Today’s time-division multiplex (TDM) PSTN was designed to accommodate a single application: uncompressed voice. The network was built to deliver 99.9994 percent up time, low-latency and jitter, highly scalable call routing through the SS7 infrastructure, and value-added voice services such as voice messaging and caller ID. The PSTN provides voice access services in 64−kbps increments known as DS–0s. The DS–0s are aggregated by digital access cross-connect systems (DACSs) for Web ProForum Tutorials http://www.iec.org Copyright © The International Engineering Consortium 2/14 presentation via DS–1 (1.5–Mbps) or DS–3 (45–Mbps) interfaces to Class 5 switches. The Class 5 switches communicate with access and toll tandem switches to route calls across the telephone network to destination Class 5 switches. The DS–0 voice calls are then split back out by DACSs to their original 64–kbps state. The multiplexing and demultiplexing of voice traffic works well in a...
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