Discuss the EoPDH and EoSDH in Microwave Transmission Networks?
In the Word of MicrowaveTransmission, there are two game-changing technologies: Ethernet over SDH (EoSDH) and Ethernet over PDH (EoPDH). These innovative approaches enable the transmission of Ethernet traffic over traditional TDM networks.
As we all know, Ethernet traffic is known for its variable length nature, while PDH/SDH networks operate on bit synchronization and time division multiplexing. The ability to transport Ethernet over PDH/SDH networks presents a tremendous advantage, allowing for the efficient utilization and repurposing of existing TDM infrastructure, even in the era of migrating to all-IP networks.
This is achieved through encapsulating Ethernet traffic within E1 frame slots or dedicated virtual containers within the STM frame. At the receiving end, the decapsulation process takes place, ensuring seamless transmission of Ethernet packets. To facilitate control and provide essential details such as frame size, traffic type, and CRC, headers are added to the frames.
However, a challenge arises due to the capacity mismatch between Ethernet traffic and fixed virtual containers in SDH, resulting in bandwidth waste. The solution lies in the concept of Virtual Concatenation Group, where multiple virtual containers are combined to form equivalent bandwidth for sending and receiving Ethernet traffic. This configuration enables the establishment of VC trunks.
Additionally, the introduction of the Link Capacity Adjustment Scheme (LCAS) revolutionizes the management of virtual concatenation groups. LCAS allows for dynamic capacity adjustments, including adding, deleting, and modifying virtual containers within the group, ensuring optimal utilization of network resources.
Let’s take a practical example: Huawei’s RTN 950 microwave cabinet equipped with the EMS6 card for EoSDH and the EFP8 card for EoPDH. These cutting-edge technologies empower efficient Ethernet transport over legacy PDH and SDH networks, driving digital transformation and infrastructure optimization.
