English to Arabic Tech/Engineering Computers: Systems, Networks

Figure 3: Core / Access DCN structure for gigabit core backbone switches.
The approach for large passenger stations and the depot area could be realized as follows:
The gigabit backbone switches will be provided with optical interfaces in order to receive the optical fiber connections coming from the next located gigabit core backbone switches and from the nearest corresponding access switch.
All uplink connections coming from the nearest located access switch to the corresponding gigabit backbone switch will be either done by optical fiber or TP links. All the connections will be redundant and routed physically though different cable conduits.