BusinessPhone Communication Platform 4.0
Fault Tracing ASB 150 02 > Fault locating

## Indication of LEDs on board(s)

The front edge of all PBAs in the PBX are equipped with LEDs of different colours. Their purpose and signalling cadence is described in the following. On system restart all LEDs are ON and go OFF during start-up sequence. Depending on their function the LEDs are in different positions on the front edge.

#### LEDs on the CPU-D

| LED | Condition | Correction
LEDs in connection field 2 | red | RP disconnects PCM bus and signalling interface from back plane | This can occur if the CP on the CPU is restarted or a board failure is detected by the RP. Check if it concerns just one or more board(s). A watchdog reset on the board could cause a board restart. System supervision will invoke a system restart if major faults occur. If LED is continuously ON check if the yellow and green LEDs flash otherwise the RP is not working
yellow | This LED indicates board start-up or if the board (individual) is blocked. | This condition is normal for a start-up sequence indicating initialisation or running self test. If this LED is ON during operation, this indicates blocking of one or more individual(s). The proper action is to check the wiring and if the connected equipment is operational (check it’s alarm indication)
green | Port is active | This indicates normal system operation and one port is active e.g. RASC
LEDs in connection field 4 | red | CP is reset | This occurs during remote upgrading of the SW or if the watchdog detects a fault. If LED is continuously on the FLASH PROMS could be re-written (refer to “RP LED conditions” in Indication of LEDs on board(s))
yellow | Flashes during start-up of CP | This LED flashes during start-up of the CP and is OFF during normal operation
green | Alarm log indication | If this LED is ON, check the logged errors, save them to disk and delete them in the log. Check in which intervals the system logs errors and if possible correct the cause
LEDs in connection field 6 | red | Cold start strap active | This LED turns on if the cold start strap below is inserted. This is a warning that if this strap is not removed during operation the system will start with initial values on restart. This occurs even if the mains fails intermittently! All customer data will be lost in this case.

#### LEDs on the IC-CU, IC-LU

LED | Correction
red | yellow | green
ON | – | – | Communication to CPU-D_ terminated. Board failure is detected by the RP.
OFF | ON | ON | PROM error (invalid checksum)
OFF | ON | Flash (4 Hz) | RAM error
OFF | ON | 0,5s ON - 4,5s OFF | FPGAs not loaded
OFF | ON | 0,5s ON - 0,5s OFF - 0,5s ON - 3,5s OFF | EPIC initialization fault
OFF | ON | 0,5s ON - 0,5s OFF - 0,5s ON - 0,5s OFF - 0,5s ON - 2,5s OFF | Initialization fault of process data
OFF | ON | 1s ON - 1s OFF | Invalid FECU connected
| red | SPU LED on (see Installation Instruction for details) | This LED flashes if the board’s SPU RP detects a fault. To correct the fault check entries in the CSM and follow suitable solution given. Flashing -> CPU fail ON steady -> warning entries not read.
red | CLU LED on (see Installation Instruction for details) | This LED is turned on if the board’s CLU RP detects a fault and/or if a base station is not initialized. Correct the fault, check entries in the CSM and follow suitable solution given.

#### LEDs on other Boards

| LED | Condition | Correction
LEDs in connection field 2 (upper part) | red | RP disconnects PCM bus and signalling interface from back plane | This can occur if the CP on the CPU is restarted or a board failure is detected by the RP. Check if it concerns just one or more board(s). A watchdog reset on the board could cause a board restart. System supervision will invoke a system restart if major faults occur. If LED is continuously ON check if the yellow and green LEDs flash, otherwise the RP is not working.
yellow | This LED indicates if the board is in start-up procedure or if the board (individual) is blocked. | This condition is normal for a start-up sequence indicating initialisation or running self test. If this LED is ON during operation, this indicates blocking of one or more individual(s). The proper action is to check the wiring and if the connected equipment is operational (check it’s alarm indication).
green | Individual is active | This indicates normal system operation and at least one e.g. extension (individual) is active on the board.
LEDs in connection field 2 (lower part) | yellow | Register is blocked | This indicates that the register function on the board is blocked e.g. on BTU-D or VMU-HD.
green | Register is active | This indicates normal system operation. This register function is active on the board e.g. on BTU-D or VMU-HD.

#### LED description during start-up

Normal start sequence | Start sequence aborted | LEDs | State | Function
Yellow | Green
1 (power up) |  | ON | OFF | RESTART | Lights up immediately for about 20 seconds
FAULT | ON | ON | PROM-fault | Start up is interrupted if a fault is discovered during self test.
FAULT | ON | R-FL1) | RAM-fault
FAULT | R-FL1) | R-FL1) | HD-fault | Hard disk is missing/not installed
FAULT | A-FL3) | A-FL3) | DSP-fault | VMU-HD only: DSP not loaded
2 |  | S-FL2) | OFF | WAIT | Entered after restart following fault-free self test and relevant RP is initiated. Waits for start order from CPU.
3 |  | R-FL1) | OFF | START | Entered in state wait for receipt of start order from CU. RP reports data to CPU, e.g. type of board
| R-FL1) | OFF | Database-fault | Condition in case of database mismatch
4 (operation) |  | ON | OFF | BLOCKED | Occurs when database does not match with reported data from RP or if at least one individual is blocked 4)
| OFF | OFF | NORMAL | Normal idle state that is entered after PBX has been started. No traffic exists on relevant board/device
| OFF | ON | TRAFFIC | Traffic on least one individual

1) |  | Rapid Flash (Frequency=4Hz).

2) |  | Slow Flash (100 ms ON and 900 ms OFF).

3) |  | Alternate Rapid Flash (Frequency=4Hz). Green and yellow LEDs toggle.

4) |  | Applies only for analogue and digital trunks. Individually blocked trunks are indicated in configuration data and not in RASC-menu Maintenance-HW/SW-RP.

#### LEDs on BTU-D

Revision: F © Ericsson Enterprise 2003