BusinessPhone Communication Platform 4.0
Maintenance Instruction ASB 150 02

## LEDs on the CPU-D4

The data uploaded into the upgrade FLASH memory has to be copied into the active FLASH memory. This data move is invoked by entering the upgrade time. When the defined time is reached a restart is invoked. The contents of the upgrade FLASH is copied into the active FLASH and the system starts up. The same procedure is started if the exchange is restarted either by power switching or reset on the CPU-D4 board. This copying process is indicated by the upper LEDs on the CPU-D4.

The CPU displays this process by lighting the LEDs on the front in a specific manner.

LED | Red | Yellow | Green | Description of condition
| on |  |  | The communication to the backplane is interrupted as soon as the red LED is on.
| fast flashing |  | Erasing of the upgrade FLASH. This takes some 30 seconds.
on | one flash | repeated flashes | Writing into PROM 1. After completing, the green LED flashes several times to recalculate the checksum.
on | two flashes | repeated flashes | Writing into PROM 2. After completing, the green LED flashes several times to recalculate the checksum
on | three flashes | repeated flashes | Writing into PROM 3. After completing, the green LED flashes several times to recalculate the checkless
on |  | repeated flashes | The green LED flashes during checksum recalculation of the programming data. Then the system restart is invoked.

Revision: E © Ericsson Enterprise 2003