Bearer Network vs Core Network vs Aggregation Network vs Access Network

Hello, friend!

Bearer Network: A network used to carry the messages of a transport-layer protocol between physical devices.

The bearer network is located between the access network and the switch and is used to transmit various voice and data services. Generally, optical fibers are used medium. as the transmission.

Currently, the bearer network integrates multiple transmission technologies such as SDH/MSTP, PTN, IPRAN, and WDM/OTN. The bearer network can be logically divided into four layers: access layer, aggregation layer, the core layer, and backbone layer, 

The access layer is the nearest segment of the bearer network. It connects to base stations and other access devices. Through base stations, wireless signals can be transmitted to mobile phones. The access layer is like a path in front of our house. We have to take this path to enter and exit. The path is narrow, so there are few cars to fit in. Similarly, the rate at the access layer is low, usually 155 Mbit/s to 1 Gbit/s. 

The aggregation layer is located above the access layer. It is like a main road in a city. Multiple paths converge into one main road, and more vehicles run on the main road. Therefore, the rate at the aggregation layer is higher than that at the access layer, usually ranging from 622 Mbit/s to 10 Gbit/s. 

The core layer is like the main road of a city. The road is wider and carries more goods. The rate at the core layer is 1 Gbit/s to 10 Gbit/s. 

The backbone layer is like an inter-provincial highway, including the provincial backbone network and national backbone network. Only inter-province calls need to be transmitted to the backbone layer. If a local call is made, the call does not need to be transmitted to the backbone layer. The rate at the backbone layer ranges from 10 Gbit/s to Tbit/s.

Thanks!