# Huawei optical modules Monitors the status of optical modules. This check will monitor the *Temperature*, *Voltage* and *optical signal power* Check Info: ## Check Info *huawei_entity_optical* * *service*: this check creates the service *Temperature* for each SFP with the interface name as the item * *state*: **critical**/**warning** if outside the limits * *wato*: upper and lower limits * *perfdata*: * Temperature in °C Sample output ![sample output](/doc/sample_temperature.png?raw=true "sample [SHORT TITLE]") ## Check Info *huawei_entity_optical.dom* * *service*: this check creates the service *DOM* for each SFP with the interface name as the item * *state*: **critical**/**warning** if outside the limits * *wato*: lower and upper levels for RX/TX signal power and levels for deviation. * *perfdata*: * RX and TX signal power in dBm * RX and TX signal power deviation in dBm Sample output ![sample output](/doc/sample_dom.png?raw=true "sample [SHORT TITLE]") ## Check Info *huawei_entity_optical.voltage* * *service*: this check creates the service *Voltage* for each SFP with the interface name as the item * *state*: **critical**/**warning** if outside the limits * *wato*: upper and lower limits * *perfdata*: * Voltage in Volt Sample output ![sample output](/doc/sample_voltage.png?raw=true "sample [SHORT TITLE]")