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9 RNC Environment Monitoring Subsystem

About This Chapter

The RNC environment monitoring subsystem automatically monitors the working environmentof the RNC and reports faults in real time.

The RNC environment monitoring subsystem consists of the power distribution boxes and theenvironment monitoring parts in each subrack. This subsystem is responsible for power supplymonitoring, fan monitoring, cabinet door monitoring, and water monitoring.

9.1 RNC Power Supply MonitoringRNC power monitoring is performed to monitor the power subsystem in real time, report therunning state of the power supply, and generate alarms when faults occur.

9.2 RNC Fan MonitoringRNC fan monitoring is performed to monitor the fans in real time and adjust the speed of thefans based on the temperature in the subrack.

9.3 RNC Cabinet Door MonitoringRNC cabinet door monitoring is optional. When the RNC detects that the front or back door ofa cabinet is open, the RNC generates and reports an appropriate alarm.

9.4 RNC Water MonitoringRNC water monitoring is optional. When the RNC detects water immersion, the RNC generatesand reports an appropriate alarm.

RNCProduct Description 9 RNC Environment Monitoring Subsystem

Issue 02 (2007-08-15) Huawei Technologies Proprietary 9-1

9.1 RNC Power Supply MonitoringRNC power monitoring is performed to monitor the power subsystem in real time, report therunning state of the power supply, and generate alarms when faults occur.

Figure 9-1 shows the power monitoring principles.

Figure 9-1 RNC power monitoring principles

Two power distribution boxes are installed at the top of the RNC cabinet. The two powerdistribution boxes are interconnected by the Ethernet cable for communication. By themonitoring signal cable, the lower power distribution box is connected to the power monitoringsubrack which is located in the bottom of the RNC cabinet. Through the backplane of the subrack,the lower power distribution box communicates with the SCUa board which is located in thepower monitoring subrack.

The RNC power monitoring process is as follows:

1. The MDMC in each power distribution box monitors the running state of the powerdistribution box and sends the monitoring results to the signal transfer board through theserial port.

2. The signal transfer board sends the monitoring signals to the SCUa board in the powermonitoring subrack of the RNC.

3. The SCUa board processes the monitoring signals. If a fault occurs, the SCUa boardgenerates and reports an alarm to the OMUa board.

9.2 RNC Fan MonitoringRNC fan monitoring is performed to monitor the fans in real time and adjust the speed of thefans based on the temperature in the subrack.

The fans are integrated with the subrack. Every subrack has a fan drawer in which there are amaximum of nine fans. The temperature sensor beside the air outlet can detect the temperaturein the subrack.

Figure 9-2 shows the fan monitoring principles.

9 RNC Environment Monitoring SubsystemRNC

Product Description

9-2 Huawei Technologies Proprietary Issue 02 (2007-08-15)

Figure 9-2 RNC fan monitoring principles

The RNC fan monitoring process is as follows:

1. The fan monitoring unit PFCU in the fan drawer monitors the running state of the fans inreal time and reports the monitoring signals to the SCUa board in the subrack.

2. The SCUa board processes the monitoring signals. If a fault occurs, the SCUa boardgenerates and reports an alarm to the OMUa board.

9.3 RNC Cabinet Door MonitoringRNC cabinet door monitoring is optional. When the RNC detects that the front or back door ofa cabinet is open, the RNC generates and reports an appropriate alarm.

Figure 9-3 shows the cabinet door monitoring principles.

Figure 9-3 RNC cabinet door monitoring principles

The door control sensor is installed on the doorhead of the RNC cabinet. The sensor is connectedto the signal transfer board of a power distribution box through a cable.

Two power distribution boxes are installed at the top of the RNC cabinet. The two powerdistribution boxes are interconnected by the Ethernet cable for communication. By the



monitoring signal cable, the lower power distribution box is connected to the power monitoringsubrack which is located in the bottom of the RNC cabinet. Through the backplane of the subrack,the lower power distribution box communicates with the SCUa board which is located in thepower monitoring subrack.

The RNC cabinet door monitoring process is as follows:

1. The door control sensor monitors the front and back doors of the RNC cabinet in real time.If the front or back door is open, the door control sensor generates appropriate monitoringsignals.

2. The monitoring signals travel to the signal transfer board of the power distribution boxthrough the cable.

3. The signal transfer board and the power distribution monitoring board MDMC process themonitoring signals and then send the signals to the SCUa board in the power monitoringsubrack of the RNC.

4. The SCUa board processes the signals, generates an appropriate door control alarm, andreports the alarm to the OMUa board.

9.4 RNC Water MonitoringRNC water monitoring is optional. When the RNC detects water immersion, the RNC generatesand reports an appropriate alarm.

Figure 9-4 shows the water monitoring principles.

Figure 9-4 RNC water monitoring principles

The water sensor of the RNC is placed on the floor of the equipment room. The sensor isconnected to the signal transfer board of a power distribution box through a cable.

Two power distribution boxes are installed at the top of the RNC cabinet. The two powerdistribution boxes are interconnected by the Ethernet cable for communication. By themonitoring signal cable, the lower power distribution box is connected to the power monitoringsubrack which is located in the bottom of the RNC cabinet. Through the backplane of the subrack,the lower power distribution box communicates with the SCUa board which is located in thepower monitoring subrack.

The RNC water monitoring process is as follows:

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1. The water sensor monitors the environment of the equipment room in real time. If the watersensor detects water immersion in the equipment room, the sensor generates appropriatemonitoring signals.

2. The monitoring signals travel to the signal transfer board of the power distribution boxthrough the cable.

3. The signal transfer board and the power distribution monitoring board MDMC process themonitoring signals and then send the signals to the SCUa board in the power monitoringsubrack of the RNC.

4. The SCUa board processes the signals, generates an appropriate water immersion alarm,and reports the alarm to the OMUa board.



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