An SFP+ temperature high alarm is triggered when the internal module temperature exceeds EEPROM-defined thresholds under the SFF-8472 standard—typically 70°C (warning) and 75°C (alarm) for commercial optics. This condition causes laser wavelength drift, APD sensitivity degradation, and increased Bit Error Rate (BER), resulting in packet loss and TCP retransmissions in. Upper and lower alarm thresholds are set for the temperature of optical modules. Configure the interval at which the I2C collects optical module alarm information. The switch will stop sending data until the optical transceiver module returns to normal working conditions before. Check Digital Optical Monitoring (DOM): Read module temperature, transmit/receive power and voltage remotely. Reduce traffic load (if possible): Lowering utilization can reduce thermal. General optical module operating temperature increases, will lead to a reduction in optical power, APC (optical power automatic control circuit) will maintain the stability of the optical module optical power, but if the temperature continues to rise, the APC will be out of control, the bias. When the operating temperature of the optical module is too high, it will cause problems such as excessive transmit optical power, received signal error, packet loss, etc.