Reading Basic Information of the Optical Module

Optical module information can be read via CLI commands, SNMP, or by accessing the module's EEPROM/DDM data to monitor identification, diagnostics, and real-time performance.Key Methods to Read Optical Module Information1. Using CLI Commands on Switches Most network switches allow you to query optical module information directly via command-line interface (CLI). For example, on Huawei switches, the command display transceiver shows all optical ports, while display transceiver interface interface-type interface-number targets a specific port. This provides details such as transceiver type, connector type, wavelength, transfer distance, vendor name, serial number, manufacturing date, and whether Digital Diagnostic Monitoring (DDM) is supported. Using the verbose parameter can reveal real-time transmit and receive power, temperature, voltage, and bias current . 2. Reading EEPROM Data Pluggable transceivers (SFP, SFP+, QSFP, QSFP28) contain an EEPROM storing a Serial-ID block (vendor, part number, serial number, capabilities) and, if supported, a diagnostics area (real-time temperature, voltage, TX/RX power). The EEPROM is accessed via the I²C bus at addresses A0h (base EEPROM) and A2h (DDM page). This method is standardized by SFF/MSA specifications, allowing predictable decoding of module information and live monitoring of optical parameters . 3. Digital Diagnostic Monitoring (DDM/DOM) DDM provides real-time monitoring of key parameters:TemperatureSupply voltageTransmit (TX) and receive (RX) optical powerAlarm and warning thresholds DDM data can be accessed via CLI or SNMP. For SNMP, you must enable DDM on the module, discover the module using its IP or MAC address, configure SNMP on the host device, and then query the relevant OIDs. For example, to read the temperature of an SFP+ module, you can use snmpwalk -v2c -c [community string] [module IP] .1.3.6.1.4.1.9.9.91.1.1.1.1.10 . 4. Module Identification and Compatibility Checks Reading module information helps verify:Vendor and part numberWavelength and type (single-mode or multi-mode)Compatibility with the switch or network deviceWhether the module is certified (e.g., Huawei-certified modules ensure proper installation, signal quality, and data bus integrity; non-certified modules may cause alarms or hardware issues), . 5. Monitoring Alarms and Thresholds Optical modules can trigger alarms for abnormal TX/RX power, temperature, or voltage. For example, Huawei devices use traps like hwOpticalPowerAbnormal or hwOpticalInvalid to indicate high/low transmit or receive power. Monitoring these values helps prevent link failures and ensures network reliability .SummaryTo effectively read optical module information:Use CLI commands for immediate port-level details.Access EEPROM/Serial-ID and DDM data for vendor, serial, and real-time diagnostics.Use SNMP for automated monitoring and integration with network management systems.Verify module certification to avoid compatibility and performance issues. By combining these methods, network administrators can monitor optical module health, troubleshoot link issues, and ensure proper network operation.