Cisco GLC-SX-MMD SFP ModuleThe Cisco GLC-SX-MMD SFP Module provides reliable Gigabit Ethernet connectivity over multimode fiber (MMF) for short-distance network applications. Operating at an 850 nm wavelength, it supports up to 550 meters on 50 µm MMF and 220 meters on 62.5 µm MMF.This transceiver features DOM (Digital Optical Monitoring), allowing real-time monitoring of optical power, temperature, and voltage for optimal network performance. The hot-swappable design simplifies installation and replacement without service interruption.Fully compliant with IEEE 802.3z 1000BASE-SX standards, the Cisco GLC-SX-MMD is ideal for enterprises seeking dependable, high-speed fiber connectivity within buildings or campus environments.The information about the optical modules contained in the labels of the Cisco optical modules can help us distinguish optical modules. For example, SX and SR in optical module models represent short distances. Transmission, ZX, EXZ stands for long-distance transmission, etc. However, due to the variety and type of Cisco optical modules, we still easily confuse different types of optical modules. In this article, we will focus on the differences between Cisco GLC-LH-SMD, GLC-SX-MMD, and GLC-ZX-SM optical modules. Divided into several types of optical modules.Cisco GLC-SX-MMD SFP Module Product PictureOptical module modelGLC-LH-SMDGLC-SX-MMDGLC-ZX-SMOptical module nameCisco GLC-LH-SMD SFP Gigabit optical moduleCisco GLC-SX-MMD SFP Gigabit optical moduleCisco GLC-ZX-SM SFP Gigabit optical modulePackage TypeSFPSFPSFPRate1000Mbps1000Mbps1000MbpsCenter wavelength1310nm850nm1550nmInterfaceDuplex LCDuplex LCDuplex LCFiber TypeMMF/SMFMMFSMFTransmission distance10km550m70kmTransmit optical power-9～-3dBm-9.5～-3dBm0～5dBmReceiving sensitivity<-21dBm<-17dBm<-24dBmDOM FunctionSupportSupportSupportLaser typeFP 1310nmVCSEL 850nmDFB 1550nmCommercial temperature0～70°C0～70°C0～70°CApplication of optical modulesGigabit EthernetGigabit EthernetGigabit Ethernet1000BASE-LXFiber ChannelFiber Channel1000BASE-LH1000BASE-SX1000BASE-ZXCompatible switchesCisco ME 3600Cisco Catalyst 3560Cisco Catalyst 2960Cisco ME 3800Cisco Catalyst 3750Cisco Catalyst 3560Cisco ME 3900Cisco Catalyst Express 500Cisco Catalyst Compact 2960See the package type, speed, interface, and commercial temperature of the three optical modules are the same, but the other aspects are different. For example, we can see from the model. In addition to the “D” in the model of the GLC-ZX-SM optical module, the other two optical modules are available, and the “D” at the end of the model represents DOM work.From GLC-LH-SMD, GLC-SX-MMD, and GLC-ZX-SM optical modules. We canYes, this means that the GLC-ZX-SM optical module does not support DOM functionality, while the other two optical modules support it.
