OTN Emerges for Metro Transport Networking - Light Reading

there is no network transport platform, while plug-and-play functionality, service evolution, capacity expansion, and
multiple service protection are hardly available.
Metro OTN is emerging
These challenges are driving many operators to simplify their OAM and upgrade their hardware, architecture, and
services for metro OTN, which is currently being moved from the metro core layer to the convergence and even the
access layer, enabling ultra-broadband service support. However, OTN network usage and OAM efficiency can be
improved in the following areas:
Simplified OTN deployment
Many elements are involved in metro OTN planning and deployment, including wavelengths, OSNR margins, chromatic
dispersion (CD) compensation, and polarization mode dispersion (PMD) compensation; simplifying them would ease
network planning and deployment remarkably.
Huawei has developed an intelligent OTN planning tool that greatly accelerates the process. Fiber connections and
optical/electrical-layer configurations can be shared between this tool and the Huawei NMS, freeing engineers from
the chores of complex planning and computation. For service configuration at multiple layers that span the client,
ODUk, OTUk, OCh, OMS, and OTH, engineers need only create OCh and client services using the NMS, as services at
the other layers will be automatically delivered by the NMS, reducing service provisioning time by 60%.
Moreover, Huawei also offers an innovative optoelectronic integrated chip (PID) solution where each PID port outputs
200G traffic, enabling this solution to use an SDH-like design and PDI-line boards with different specifications to meet
different transmission distances, eliminating the need for complex wavelength planning, board selection, OSNR
calculation, and OA board computation.
End-to-end OTN network OAM
Metro OTN networks require end-to-end OAM capabilities similar to those for SDH networks. Huawei's metro OTN
networking supports resource usage statistics at the electrical layer (especially the ODU1/2/3 layer of the OCh) and the
optical layer between WDM NEs, while also supporting client-side port resource statistics, facilitating the clear display
of resource usage status, and performing expansion planning.
Bidirectional WDM trails on OTN networks must be connected to prevent residual cross-connections when a channel is
deleted. OTN networks should be monitored in terms of optical-layer network performance, end-to-end OAM for
cross-connections, wavelengths, sub-wavelengths, and Ethernet services. Huawei's metro OTN supports Layer 2
features similar to those for Ethernet data services, greatly reducing the time spent on onsite maintenance.
With Huawei OTN networking, regeneration boards are configured for each PID site; this SDH-like design enables
timely fault location, while PID sites require only standard maintenance skills, meaning that they can be maintained by
regular SDH engineers.
Huawei's metro OTN solutions can help operators boost their network operations, thanks to a number of enhanced
features such as PID and OTN integration, expanded OTN cross-connection, and simplified OTN planning and O&M.
2 HUAWEI TECHNOLOGIES CO., LTD.