Some Nokia SFPs, XFPs, and the MSA DWDM transponder support the Digital Diagnostics Monitoring (DDM) capability, which allows the transceiver module to maintain information about its working status in device registers, including:
temperature
supply voltage
transmit (Tx) bias current
Tx output power
received (Rx) optical power
The optical transceiver DDM feature provides real-time values for guidance. For the specific values, the optical power data provides an accuracy of ±3 dB or better. The accuracy of this data is defined in the relevant standard for the transceiver type, such as SFF-8472 for SFP+. Use an optical power meter where precise optical power data is required. Contact your Nokia technical support representative for further assistance or clarification.
The transceiver is also programmed with warning and alarm thresholds for low and high conditions that can generate system events. These thresholds are programmed by the transceiver manufacturer.
No CLI command configuration is required to support DDM operations. However, the show port port-id detail command displays DDM information in the Transceiver Digital Diagnostics Monitoring output section.
The Tx and Rx power displayed in the DDM output are average optical power in dBm.
DDM information is populated into the router MIBs, so the DDM data can be retrieved by Network Management using SNMP. Also, RMON threshold monitoring can be configured for the DDM MIB variables to set custom event thresholds if the factory-programmed thresholds are not at the wanted levels.
The following are potential uses of the DDM data:
optics degradation monitoring
With the information returned by the DDM-capable optics module, degradation in optical performance can be monitored and trigger events based on custom or the factory-programmed warning and alarm thresholds.
link/router fault isolation
With the information returned by the DDM-capable optics module, any optical problem affecting a port can be quickly identified or eliminated as the potential problem source.
The following table describes supported real-time DDM features.
Parameter |
User units |
SFP/XFP units |
SFP |
XFP |
MSA DWDM |
|---|---|---|---|---|---|
Temperature |
Celsius |
C |
Supported |
Supported |
Supported |
Supply Voltage |
Volts |
µV |
Supported |
Supported |
Not supported |
TX Bias Current |
mA |
µA |
Supported |
Supported |
Supported |
TX Output Power |
dBm (converted from mW) |
mW |
Supported |
Supported |
Supported |
RX Received Optical Power4 |
dBm (converted from dBm) (Avg Rx Power or OMA) |
mW |
Supported |
Supported |
Supported |
AUX1 |
parameter dependent (embedded in transceiver) |
- |
Not supported |
Supported |
Not supported |
AUX2 |
parameter dependent (embedded in transceiver) |
- |
Not supported |
Supported |
Not supported |
The following table describes supported factory-programmed DDM alarms and warnings.
Parameter |
SFP/XFP units |
SFP |
XFP |
Required? |
MSA DWDM |
|---|---|---|---|---|---|
Temperature - High Alarm - Low Alarm - High Warning - Low Warning |
C |
Yes |
Yes |
Yes |
Yes |
Supply Voltage - High Alarm - Low Alarm - High Warning - Low Warning |
µV |
Yes |
Yes |
Yes |
No |
TX Bias Current - High Alarm - Low Alarm - High Warning - Low Warning |
µA |
Yes |
Yes |
Yes |
Yes |
TX Output Power - High Alarm - Low Alarm - High Warning - Low Warning |
mW |
Yes |
Yes |
Yes |
Yes |
RX Optical Power - High Alarm - Low Alarm - High Warning - Low Warning |
mW |
Yes |
Yes |
Yes |
Yes |
AUX1 - High Alarm - Low Alarm - High Warning - Low Warning |
parameter dependent (embedded in transceiver) |
No |
Yes |
Yes |
No |
AUX2 - High Alarm - Low Alarm - High Warning - Low Warning |
parameter dependent (embedded in transceiver) |
No |
Yes |
Yes |
No |