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Features of GPON technology

July 15, 2019

Supports source mode TDM, IP data and video services, that is, including "IPTV" triple play services, and provides one or more users with the ability to continuously and adjust bandwidth over time.

GPON provides IGMP Proxy and IGMP Snooping multicast functions, which facilitates multicast control and better meets the needs of IPTV multicast services.

1. Large capacity, can solve the bottleneck problem of the access network
The Gigabit-class GPON (Gigabit PON) network system with 2.488Gbps downlink and 1.244Gbps uplink speed can be extended to 10Gbps through the built-in CWDM module. Such a high line rate will support more services and mean more revenue.

2. High bandwidth and resource sharing
GPON has a high bandwidth of nearly 2.5G, which opens up the original bandwidth bottleneck of the optical access network and lays a high-quality bandwidth foundation for the future development of new services (IP network TV, triple play, etc.). Moreover, high bandwidth is exclusive to a single user (FTTH) or shared by multiple users (FTTB or FTTC, etc.) and provides priority and QoS guarantees.

3. High transmission efficiency
All transmission data is encapsulated into a 25us fixed-length frame structure using the new GFP adaptation protocol. Compared with APON and EPON technologies, it has fewer overhead bytes and higher transmission efficiency; transmission bandwidth of nearly 2.5G In the case of demand, the transmission efficiency of GPON is 93%, while the transmission efficiency of A/BPON and EPON is 70% and 49%, respectively. GPON's line rate and efficiency and segmentation rate are high, so it provides the flexibility.

4. Flexible access network structure and flexible expansion
GPON systems can support multiple network topologies such as ring and tree. The backbone only needs single-core/double-core fiber, and accesses various services through the passive optical distribution network (ODN). The branching capacity of GPON is 1:32, which is beyond the reach of active devices. For example, for a new expansion site, it is only necessary to extract a core fiber from the reserved branch port of the nearest passive optical splitter to the new optical network terminal ONT/ONU installation point, and only increase the number of ONT/ONUs to achieve capacity expansion. Therefore, the user can be developed in a rolling manner; and the construction cost of the network can be greatly reduced.