FOM SFP Alarm Supervision
SWT 3000 FOM module is equipped with a SFP transceiver for fiber-optic connection. The SFP with a digital
diagnostic monitoring interface (DDMI) is allowed to read out real-time diagnostic information and alarm
status. The DDMI interface is only available if SFP module is compliant with SFP-8472.
Enable DDMI function
By default, DDMI monitor is disabled. It can be enabled in SWT 3000 SNMP MIB (SIEMENS-SWT3000R35.MIB)
by SNMP SET command. The MIB OID is defined as below:
OID
Description
swtInfoSfp1Enable
= enabled(1):
Enable SFP-1 DDMI monitor functionality
swtInfoSfp2Enable
= enabled(1):
Enable SFP-2 DDMI monitor functionality
swtIpActivationReq
Enable SFP-2 DDMI monitor functionality
Store setting in flash and restart device.
Supervise SFP alarm
If DDMI monitor is disabled or DDMI interface is not supported with used SFP module, alarm supervision is
skipped. SFP alarm status is monitored periodically. If alarm flag is set, general alarm is triggered. If warning
flag is set, non-urgent alarm is triggered. The active alarm / warning is displayed in PowerSys: SWT 3000 >
Information > Alarms / Errors.
Severity
Label
Explanation
WAR
TEMP_WAR
SFP-1/2: Temperature high or low
warning
WAR
VCC_WAR
SFP-1/2: Voltage high or low
warning
WAR
BIAS_WAR
SFP-1/2: Tx bias current high or low
warning
WAR
TXW_WAR
SFP-1/2: Tx power high or low
warning
WAR
RXW_WAR
SFP-1/2: Rx power high or low
warning
ALA
TEMP_ALA
SFP-1/2: Temperature high or low
alarm
ALA
VCC_ALA
SFP-1/2: Voltage high or low alarm
ALA
BIAS_ALA
SFP-1/2: Tx bias current high or low
alarm
ALA
TXW_ALA
SFP-1/2: Tx power high or low
alarm
ALA
RXW_ALA
SFP-1/2: Rx power high or low
alarm
For long-distance SFP (for example up to 150 km), FOM module is running exceeding the default Rx power
threshold. There is permanent Rx power alarm reported from DDMI interface. In this case, the SFP DDMI
monitor function shall be disabled. The Tx / Rx power state can be polled by NMS tool and compared with
customized threshold.
Read diagnostic information
SFP-1/2 real-time diagnostic information and alarm threshold can be readout from SWT 3000 SNMP MIB via
SNMP GET command. The example value queried from DDMI interface (Avago AFCT-5765ATPZ) is listed as
below:
4.8
Diagnostics and Error Handling
4.8 FOM SFP Alarm Supervision
198
Smart Communication, SWT 3000 Teleprotection, Equipment Manual
C53000-G6040-C605-1, Edition 03.2020