Before disconnecting the IF cable from an IF board, power off the ODD.

The statement is correct, assuming "ODD" is a typographical error for "ODU" (Outdoor Unit), which is the standard terminology in Huawei microwave transmission systems. The Intermediate Frequency (IF) cable that connects the Indoor Unit's (IDU) IF board to the ODU carries not only the IF signals but also the DC power for the ODU. Disconnecting this cable while the ODU is powered on (a "hot-unplug") can cause electrical arcing at the connector. This arc can damage the sensitive electronic components on the IF board port and within the ODU, potentially leading to equipment failure. Therefore, it is a mandatory safety and operational procedure to power off the ODU before disconnecting the IF cable from the IF board.

The "False" option is incorrect because it would imply that it is safe to disconnect the IF cable while the ODU is powered. This contradicts standard safety precautions for handling powered electronic equipment and specific vendor guidelines designed to prevent hardware damage from electrical arcing and power surges.

1. Huawei Technologies Co.

Ltd. (2016). OptiX RTN 950A Radio Transmission System V100R008C10 Installation Guide. Document Issue 15. In the section "Replacing an IFU2 Board"

the procedure explicitly states: "1. Query the running status of the board to be replaced. If the board is running

power off the ODU that is connected to the board. ... 3. Disconnect the IF cable from the IF port on the board." This directly confirms that the ODU must be powered off before the IF cable is disconnected from the IF board.

2. Huawei Technologies Co.

Ltd. (2017). OptiX RTN 980 Radio Transmission System V100R009C10 Installation Guide. Document Issue 12. In the section "Replacing an ODU"

the procedure includes the step "Power off the ODU" before instructing the technician to "Disconnect the IF cable from the IF port on the ODU." While this describes disconnection at the ODU end

the principle of de-energizing the line before breaking the physical connection is identical and applies to disconnection at the IF board as well.

3. Huawei Technologies Co.

Ltd. (2019). General Safety Precautions. Document Version 1.18. This document outlines fundamental safety principles for handling Huawei equipment. Section 1.3 "Electrical Safety" warns against connecting or disconnecting power cables with the power on

stating: "Before connecting or disconnecting a power cable

turn off the power switch." The IF cable functions as a power cable for the ODU

making this general precaution directly applicable.