Ericsson LBI-39128 manual Startup, Monitor

OPERATION

The PMU performs the following operations:

∙Monitors the detector output voltages from the transmitter and antenna power sensors under the direction of the Site Controller computer.

∙Converts the detector output voltages to power and SWR levels.

∙Compares the power and SWR levels to user- configurable alarm threshold limits.

∙Sets the power alarm status for each monitored transmitter and antenna.

∙Reports the power alarm status of each transmitter and antenna to the Site Controller computer.

The Site Controller computer performs the following operations:

∙Tells the PMU which transmitter channels to monitor.

∙Tells the PMU when each transmitter starts and stops transmitting.

∙Uses the power alarm status to help determine which transmitter channels are useable.

∙Uses the power alarm status to control the ANT PWR FAIL and CHN PWR FAIL indicators on the Alarm and Control Unit (if present in the system).

∙Uses the power alarm status to direct Test Calls by the Test Unit (if present in the system).

∙Reports the power alarm status to the System Manager (if present in the system).

STARTUP

Directions from the Site Controller computer to the PMU, and reports of power alarm status from the PMU to the Site Controller computer, are sent over the serial data link connecting the two.

Polling Recovery

As soon as the Site Controller computer is operating (power on and initialization complete) and the parameter that enables the PMU option is enabled (initialized from the Personality PROMs or re-configured from the System

Manager), it should start sending a poll message to the PMU once each second (even if the PMU doesn’t reply or isn’t connected).

As soon as the PMU is operating (power on), it should start looking for messages from the Site Controller computer (even if the Site Controller computer isn’t sending a poll message or isn’t connected). As soon as it receives a poll message, it should reply with a status message within one second.

EDACS Configuration Setup

After receiving five consecutive status message responses (each within one second) to five consecutive poll messages, the Site Controller computer should send the EDACS Configuration Setup information to the PMU. This information consists of which transmitter channel numbers are PMU enabled, and the low alarm limit for each transmitter channel number.

After receiving the EDACS Configuration Setup information, the PMU should be ready to monitor the transmitter and antenna power sensors under the direction of the Site Controller computer. The Site Controller computer should continue to send a poll message to the PMU once each second, and the PMU should continue to reply with a status message within one second of each poll message.

Polling Failure

If at any time the PMU fails to reply to a poll message within one second, or the Site Controller computer is initialized (by reset or power-up), the Site Controller computer must again receive five consecutive replies and send the EDACS Configuration Setup information before the PMU is again ready to monitor the power sensors.

MONITOR

Power Sensor Monitoring

When the PMU is ready to monitor the power sensors, the Site Controller computer sends a message to the PMU each time a transmitter is keyed or unkeyed. The message tells the PMU which transmitters are keyed (transmitting), and which are not. From the EDACS Configuration Setup information and the user-configured PMU parameters, the PMU determines which keyed transmitter channel numbers are PMU enabled, which sensors to monitor, what calculations to make, and what alarm limits to use.

Every 250 milliseconds the PMU should measure all analog inputs associated with all PMU enabled keyed