BBF Releases Standards for Modularization of DBA


BBF (Broadband Forum), a non-profit industry organization composed of the industry’s leading broadband operators, vendors, and thought leaders, has released new standards for the modularization of the Dynamic Bandwidth Assignment (DBA) function. The standards initiated by NTT (Japan) and CHT (Taiwan) represents a significant advance in the Quality of Service (QoS) of optical access systems and a milestone for 5G by accelerating the time-to-market for time-critical applications.

NTT and CHT have jointly proposed application cases of the DBA software module and developed the API specifications as international standards within the Broadband Forum. The new specifications define an Application Programming Interface (API) that enables the DBA software module to be replaced. As a result, optical access systems can quickly and cost-effectively provide a wide range of services, including support for 5G fronthaul interfaces and services for business users.

Illuminated picture showing letters of Broadband standards These technology evolutions will enable carriers to use a common access system for a diverse range of services including the accommodation of base stations for 5G mobile systems, which place strict requirements on acceptable latency thresholds. Modularization of Dynamic Bandwidth was a significant achievement. DBA has time-critical characteristic and requires high-speed processing in the region of sub-milliseconds. DBA is a crucial function that significantly impacts QoS in optical access systems.

A widespread acceptance and use of the API as an international standard will lead to the drastic expansion of the application area of optical access systems.

Newly Developed BBF Standards

1. TR-402 – Functional Model for PON Abstraction Interface 

TR-402 provides an overview of the
modularization of the DBA function, including an application case regarding accommodation of base stations for 5G mobile systems over an optical access network. It also specifies the functional requirements of the API.

2. TR-403 – PON Abstraction Interface Specifications

TR-403 specifies details of the API,
including format and performance requirements.

These two standars are the result of the Broadband Forum’s project, which was launched by NTT 2017’PON, named “Abstraction Interface for Time Critical Applications (TCAs)”

In 2018, NTT demonstrated Optical Line Terminal (OLT) modularization and succeeded in developing and testing OLT prototypes with the API that enables the smooth replacement of DBA software modules to meet new service requirements.

NTT look forward to modularize the remaining access functions in cooperation with carriers, system vendors, Standards Developing Organizations (SDOs), and Open Source Software (OSS) organizations in order to avoid the significant investment of redeveloping hardware-level equipment from scratch. This will result in cost-effective access systems that can quickly meet various requirements.

What is DBA?

DBA or Dynamic Bandwidth Assignment. is a function to control the dynamic bandwidth for point-to-multi point optical access networks. This control is done to avoid the possible collision of upstream data from multiple ONUs (Optical Network Units). The DBA function in an OLT assigns times to each ONU at which to start upstream transmission and the transmission duration.

What is BBF?
BBF (Broadband Forum) is a non-profit industry organization composed of the industry’s leading broadband operators, vendors, and thought leaders, BBF’s work to date has been the foundation for broadband’s global proliferation and innovation.

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