Open RAN  

Topology

Following is general topology showing the connectivity among Open RAN components. You can take this as a logical connection rather than physical connection. In physical deployment, these layers (i.e, DU, CU, Core Network) are connected in other structure like ring topology.

A few points to be noticed in this topology are :

• Each CU may be connected to multiples of DUs
• Each DU may be connected to multiple of RUs
• The distance between RU and DU is relatively short (less than 20 km) and timing requirement on this link is stringent (less than 500 us).
• The distance between DU and CU is relatively long (20~40 km) and timing requirement on this link is less stringent (1.5~10 ms)

Reference