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Network Infrastructure Magazine | Friday, November 04, 2022
The adoption of OTN is due to its greater multiplexing capability, which allows IP, Ethernet, storage, and digital video and transmission across an OTN framing structure.
FREMONT, CA: Optical Transport Network (OTN) is a telecommunications industry-standard protocol that efficiently transports, switches, and multiplexes services onto high-capacity wavelengths over the optical network. Network providers use OTN-enabled technology in their optical networks for higher resiliency, streamlined operations, enhanced Service-Level Agreements (SLA), extended reach with Forward Error Correction (FEC), efficient wavelength fill, and guaranteed end-to-end service delivery. OTN is a "digital wrapper" because it transparently wraps each client or service into a container for transport across optical networks, keeping its native structure, timing, and management information.
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Quicker service: New services can introduce quickly by setting line capacity between the meshed network's start and end nodes. It contrasts with transponder-based architecture, which involves dedicating a new wavelength between two bandwidth sites—adding line capacity when fill levels surpass planning thresholds. Fast service turn-up is a competitive differentiator and a critical building element for a more dynamic, on-demand network that allows operators to respond quickly to service requests to meet changing consumer expectations and unforeseen traffic requirements.
Optimize network performance: OTN may map several clients onto Dense wavelength-division multiplexing (DWDM) wavelength and share an optical network. It allows network operators to run DWDM lines without stranded capacity, enhancing network efficiency. ODUflex traffic containers optimize network bandwidth, especially for sub-rated Ethernet/packet services. Providers can efficiently match the service being carried by accurately adjusting the OTN container size using a packet/OTN centralized fabric that supports ODUflex containers.
FEC enables enhanced performance: OTN's ability to establish an out-of-band FEC scheme applied to the signal before transmission is a significant advantage. FEC significantly increases network impairment tolerance for high-capacity broadcasts by correcting and detecting mistakes in the optical link. FEC considerably boosts the system margin for a given Bit Error Rate (BER) and signal power, permitting greater network lengths. It allows providers to expand the distance between optical repeaters, which reduces both capital and operational costs and simplifies network topology by allowing providers to bypass amplifier sites.
Unique services: OTN switching and the L1 (OTN) control plane allows operators to construct, protect, and restore services according to SLAs and policies. OTN switches can reconfigure quicker than ROADMs, enabling fast service restoration in a packet or OTN mesh-based network with a control plane.
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