OTN Layer

Optical Transport Network Layer

The OTN layer evolved over Layer-1 of the DWDM network for enabling more efficient convergence of traditional SONET/SDH transport and new data services, into a common optical transport network layer.

PacketLight OTN muxponders and transponders enable connectivity over long distances based on ITU G.709, with full performance monitoring and management.

The optical transport network (OTN) and WDM layers make up a generic Layer-1 transport network, enabling different service types to coexist and share the same infrastructure transparently, without affecting each other's performance. As an example, service providers can offer any combination of SONET/SDH services, data services such as Layer-3 multiprotocol label switching (MPLS) or Layer-2 metro Ethernet, and storage and video services, on the same optical network backbone infrastructure.

OTN Product Family

OTN Product Family

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PacketLight solutions are ITU G.709 standards-based and can interface with any existing third party OTN network. The OTN layer is designed for highly effective mapping of different protocols and rates into the same 10G (OTU2), 100G (OTU4), 200G (OTUC2), or 400G (OTUC4) uplink pipe, providing simpler, transparent, high bandwidth capabilities at a comparatively low cost.

Advantages of the OTN Layer

OTN infrastructure enables transport over longer distances with less regeneration sites, by utilizing forward error correction (FEC) embedded within the layer, forming an efficient and cost-effective multi service provisioning platform (MSPP) over long haul and metro WDM infrastructure.

The FEC layer increases the optical network distance by improving OSNR by 6-8dB without the need to use costly regenerator sites, required in traditional SONET/SDH backbone networks (see Figure 1).

Diagram of OTN Link with no Regenerators
Figure 1: Diagram of Long OTN Link with No Need for Regenerators

Simple Performance Monitoring

Any protocol (SONET/SDH, Ethernet or Fibre Channel) carried over the OTN layer shares the same OTN performance monitoring information. Performance monitoring of the OTN layer alone, regardless of the service type transported over the network, simplifies and significantly reduces monitoring costs and resources.

Operational Cost Savings

The key to saving network operational costs is having effective operation, administration, maintenance, and provisioning (OAM&P) capabilities built into the signal format. The OTN OAM &P provides remote management and all monitoring/transparency needed for reliable service provisioning.

Diagram of OTN Mapping of Signals

Figure 2: Diagram of OTN Mapping of Signals

The OTN signal incorporates overhead optimized for efficient direct mapping of LAN, SONET/SDH and SAN signals and other lower rate client signals over carrier WDM networks (see Figure 2, above).

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