The System Control, Switching, and Timing Board for the RTN 910A, specifically the CSHNA board, is a core component that integrates multiple functions. Its front panel is equipped with various interfaces to support these functions. It includes Gigabit Ethernet (GE) ports (both electrical and optical SFP-based) for service access and aggregation. It also features Intermediate Frequency (IF) ports, which are essential for connecting the indoor unit (IDU) to the outdoor radio unit (ODU) to establish the microwave link. These interfaces are fundamental to the board's role in processing, switching, and transmitting service data over the microwave path.

B. Power input ports: The RTN 910A chassis has a dedicated Power Interface Unit (PIU) or direct chassis-level inputs for power; the CSHNA board receives power through the backplane.

D. RJ11 ports: The CSHNA board uses RJ45 connectors for its NMS (Network Management System) port and external clock/time ports, not the smaller RJ11 telephone connectors.

1. Huawei Technologies Co.

Ltd. (2020). OptiX RTN 900 Radio Transmission System V100R019C10 Hardware Description. Document Issue 21. Section: "Boards"

Subsection: "CSHNA".

Page 161 (Section 4.2.10 CSHNA): The front panel diagram and interface/indicator table for the CSHNA board explicitly show "GE1(e)/GE2(e)"

"GE3(o)/GE4(o)"

and "IF1"

"IF2" ports. This directly confirms the presence of GE and IF ports. The document also shows that power is supplied via the backplane

and management ports are RJ45.