Introduction
OLT uplink ports (also called upstream ports or aggregation ports) are the critical interfaces connecting the OLT to the upper-layer network (aggregation/core layer). The uplink port type and bandwidth directly determine the throughput capacity of the entire access network. Choosing the right uplink configuration is essential for ensuring optimal network performance and scalability.
Common OLT Uplink Port Types
SFP+ 10G Uplink
SFP+ is the most common OLT uplink port type, offering 10Gbps bandwidth. It is ideal for small to medium-sized OLT devices. SFP+ OLT modules support transmission distances up to 10km, suitable for most metro network deployments.
QSFP+ 40G Uplink
QSFP+ ports provide 40Gbps bandwidth, suitable for medium to large OLT devices requiring higher aggregation capacity. They are commonly used in central office deployments where multiple OLTs aggregate traffic.
100G/QSFP28 Uplink
100G uplinks are used for large OLT devices (16 ports or more). Paired with 100G optical modules, they deliver the highest bandwidth for demanding environments.
Uplink Bandwidth Planning
It is recommended that uplink bandwidth should not be less than 50% of the total peak user bandwidth. An 8-port GPON OLT at full load requires approximately 51.2Gbps, suggesting a 40G or dual 10G uplink configuration.
Configuration Recommendations
Small OLT (4 ports) → 1×10G | Medium (8 ports) → 2×10G or 1×40G | Large (16 ports) → 2×40G or 1×100G
Langzhi OLT series supports flexible 10G-100G uplink configurations for all deployment scenarios.
