Huawei DWDM Flexible Bandwidth Utilization Based on ODUflex

Huawei OptiX OSN 8800 supports the optical data unit flexible (ODUflex) feature. This feature enables the OptiX OSN 8800 to adapt itself to various services, such as video, storage, and data services as well as future IP services.

Transport of Generic CBR Signals

ODUflex can be used to transmit constant bit rate (CBR) services on an optical transport network (OTN). The services whose CBRs are higher than 2.48832 Gbit/s are mapped to an ODUflex (CBR) container in bit synchronization mode. Functions such as end-to-end performance monitoring and protection switching are feasible on the ODUflex (CBR) container. The overheads and monitoring management modes of ODUflex services and traditional ODUk are the same.

below shows how ODUflex is used to transport generic CBR signals. An FC400 service occupies four ODTUk timeslots and is mapped to an ODUflex container. A 3G-SDI service occupies three ODTUk timeslots and is mapped to an ODUflex container. Each ODTUk timeslots provides 1.25 Gbit/s bandwidth. The FC400 and 3G-SDI services share the same OTU2 wavelength.

ODU2 is used to transport generic CBR signals. The FC400 and 3G-SDI services are mapped to different ODU2 containers. Therefore they occupy different OTU2 wavelengths.

Transport of VBR Packet Services

ODUflex can also be used to transport variable bit rate (VBR) packet services to address the requirements of transporting packet services running at VBRs. Since packet services run at VBRs, ITU-T has defined ODUflex(GFP) signals for transporting packet services over an OTN network. The ODUflex(GFP) signals are mapped differently from CBR client signals and use different bit rates as the ODUflex(CBR) signals. The ODUflex(GFP) signals are mapped using the GFP-F method and the bit rate for the signals is defined to about N x 1.25 Gbit/s, where N represents the number of the ODTUk timeslots.

In this application, ODUflex ensures that resilient packet services are correctly transmitted over Huawei OTN network. For example, ODUflex can be used in a 3G backhaul bearer network or an enterprise/bank packet quality private line application. ODUflex(GFP) can flexibly resize the bandwidth based on the bandwidth required by packet services and therefore adapts to flexible changes in service bandwidth and ensures high-quality service transmission.