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ezhupa
Staff
ezhupa
Staff
June 20, 2025

Troubleshooting Tip: AVAGO Transceiver not showing Temperature/Voltage statistics

  • June 20, 2025
  • 0 replies
  • 457 views
Description This article explains issues with certain AVAGO transceivers not showing relevant statistics in the CLI and how to fix it.
Scope FortiGate,
Solution When running CLI commands such as 'get sys interface transceiver <port>', the normal expectation is to receive output regarding the following values: 'Temperature/Voltage/Optical'.
However, when using an AVAGO transceiver with part number AFBR-79EBPZ, these values are not shown. 

Below is a similar output:

 
TEST_FortiGate # get system interface transceiver portXX
 Interface portXX - QSFP/QSFP+ (4 x 20.6G)
   Diagnostics  :            Unspecified
   Vendor Name  :            AVAGO           
   Part No.     :            AFBR-79EBPZ     
   Serial No.   :            XXXXXXXXXX
   Measurement  Unit         Value        High Alarm   High Warning Low Warning  Low Alarm
   ------------ ------------ ------------ ------------ ------------ ------------ ------------              
   Temperature  (Celsius)      0.0 ?        0.0          0.0          0.0          0.0       
   Voltage      (Volts)       0.00 ?       0.00         0.00         0.00         0.00       
   Ch1 Tx Bias  (mA)          0.00 ?       0.00         0.00         0.00         0.00       
   Ch2 Tx Bias  (mA)          0.00 ?       0.00         0.00         0.00         0.00       
   Ch3 Tx Bias  (mA)          0.00 ?       0.00         0.00         0.00         0.00       
   Ch4 Tx Bias  (mA)          0.00 ?       0.00         0.00         0.00         0.00       
   Ch1 Rx Power (dBm)         -inf ?       -inf         -inf         -inf         -inf       
   Ch2 Rx Power (dBm)         -inf ?       -inf         -inf         -inf         -inf       
   Ch3 Rx Power (dBm)         -inf ?       -inf         -inf         -inf         -inf       
   Ch4 Rx Power (dBm)         -inf ?       -inf         -inf         -inf         -inf       
   ++ : high alarm, + : high warning, - : low warning, -- : low alarm, ? : suspect.

This is not an issue on the FortiGate or FortiOS side.  This seems to be a limitation on the hardware QSFP, as the transceiver 'AFBR-79EBPZ' does NOT support Temp/Voltage/Power monitoring.
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