This alarm is reported when the maintenance link between the BBU and the RF unit malfunctions.

Parameters

Parameter Name	Parameter Description
Cabinet No.	Cabinet number of the faulty RF unit
Subrack No.	Subrack number of the faulty RF unit
Slot No.	Slot number of the faulty RF unit
Board Type	Type of the faulty board

Impact on the System

Alarm Severity	Alarm Impact
Major	The ongoing services carried on the RF unit are disrupted.

System Actions

The RF unit automatically resets 10 minutes after the maintenance link is broken.

Possible Causes

·     The CPRI link between the current-level RF unit and the BBU or upper-level RF unit is broken.

·     The RF unit is not powered on or running improperly.

·     The RF unit hardware is faulty.

Procedure

1.     Check for the correlated alarm on the M2000.

a.   Check for the correlated alarm on the CPRI port of the RF unit on the M2000:

26234 BBU CPRI Interface Error

26230 BBU CPRI Optical Module Fault

26231 BBU CPRI Optical Module or Electrical Port Not Ready

26232 BBU Optical Module Transmit/Receive Fault

Y => The correlated alarm exists. Go to sub-step b.

N => The correlated alarm does not exist. Go to step 2.

b.   Clear the correlated alarm according to the relevant handling suggestions.

Check whether the alarm is cleared.

Y => The alarm is cleared. No further action is required.

N => The alarm is not cleared. Go to step 2.

2.     Reset the RF unit on the M2000.

a.   Run the MML command RST BRDPWROFF on the M2000 to reset the RF unit through power-off.

Check whether the alarm is cleared.

Y => The alarm is cleared. No further action is required.

N => The alarm is not cleared. Go to step 3.

3.     Check the running status of the RF unit on site.

a.   Check whether the RUN LED on the RF unit blinks (ON for 1s and OFF for 1s).

Y => The RUN LED blinks (ON for 1s and OFF for 1s). Go to step 4.

N => The RUN LED does not blink (ON for 1s and OFF for 1s). Go to sub-step b.

b.   Power off and power on the RF unit. Wait until the RUN LED blinks (ON for 1s and OFF for 1s).

Check whether the alarm is cleared.

Y => The alarm is cleared. No further action is required.

N => The alarm is not cleared. Go to step 4.

4.     Replace the RF unit on site.

a.   Replace the RF unit.

Check whether the alarm is cleared.

Y => The alarm is cleared. No further action is required.

N => The alarm is not cleared. Reinstall the original board. 

Good stuff, good to know about WiMax troubleshooting.

Impressive

useful document, thanks