What is the minimum unit for gpon upstream bandwidth scheduling?

The minimum unit of gpon uplink bandwidth scheduling is "T-CONT"; "T-CONT" is the carrier for gpon uplink services, and all "GEM Ports" must be mapped to "T-CONT" , the OLT is uplinked through DBA scheduling. "T-CONT" is the most basic control unit for the uplink bandwidth in the GPON system.

The operating environment of this tutorial: Windows 10 system, DELL G3 computer.

What is the minimum unit of gpon upstream bandwidth scheduling?

The minimum unit of gpon upstream bandwidth scheduling is T-CONT

T-CONT is a GPON system The most basic control unit for mid-uplink bandwidth. Each T-CONT is uniquely identified by Alloc-ID. The Alloc-ID is assigned by each GPON port of the OLT. That is, the ONU under the same GPON port of the OLT does not have a T-CONT with the same Alloc-ID.

T-CONT (Transmission Container) is the carrier that carries services in the upstream direction of GPON. All GEM Ports must be mapped to T-CONT, and the OLT schedules the upstream through DBA (Dynamic Bandwidth Allocation). (T-CONT is the upstream traffic scheduling unit of DBA, that is, the service container.) T-CONT is the basis for DBA implementation. Through ONU's bandwidth application for T-CONT and OLT's authorization of T-CONT, the entire GPON system's upstream services are realized. Flow DBA.

T-CONTs (Transmission Containers): Dynamically receives the authorization issued by the OLT, and is used to manage the upstream bandwidth allocation of the transmission aggregation layer of the PON system and improve the upstream bandwidth in the PON system.

T-CONT includes five different types, and different types of T-CONT can be selected according to different types of services. Each T-CONT bandwidth type has specific QoS characteristics. QoS characteristics are mainly reflected in bandwidth guarantee, which is divided into fixed bandwidth, guaranteed bandwidth, guaranteed/maximum bandwidth, maximum bandwidth, and mixed mode (corresponding Type1 to Type5).

X in the table represents the fixed bandwidth value, Y represents the guaranteed bandwidth value, and Z represents the maximum bandwidth value

Extended knowledge

GPON (Gigabit-Capable PON) technology is the latest generation of broadband passive optical integrated access technology based on the ITU-TG.984.x standard, which has high bandwidth and high efficiency. , large coverage, rich user interfaces and many other advantages, it is regarded by most operators as an ideal technology to achieve broadband and comprehensive transformation of access network services. GPON was first proposed by the Full-Service Access Network (FSAN) organization in September 2002. On this basis, ITU-T completed the formulation of ITU-TG.984.1 and G.984.2 in March 2003. , the standardization of G.984.3 was completed in February and June 2004, thus forming the GPON standard family.

Main features of GPON technology:

(1) Unprecedented high bandwidth. GPON has a rate of up to 2.5 Gbps, which can provide sufficient bandwidth to meet the growing demand for high bandwidth in future networks. At the same time, the asymmetric characteristics are more suitable for the broadband data service market.

(2) Full-service access with QoS guarantee. GPON can carry ATM cells and/or GEM frames at the same time, and has the ability to provide service levels, support QoS guarantees and full-service access. The technology of ATM carrying multiple services such as voice, PDH, and Ethernet is very mature; the technology of using GEM to carry various user services has also been unanimously recognized by everyone and has begun to be widely used and developed.

(3) Support TDM business well. TDM services are mapped into GEM frames. Since the GPON TC frame length is 125 μs, it can directly support TDM services. TDM services can also be mapped to ATM cells, and can also provide real-time transmission with QoS guarantee.

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