GLC-SX-MM vs SFP-GE-S different

what is the differences between GLC-T and SFP-GE_T?

let’s look at the GLC-SX-MM vs SFP-GE-S Specific parameters

GLC-SX-MM Specifications

• Form Factor: SFP
• Device Type: Transceiver module
• Interface (Bus) Type: Plug-in module
• Connectivity Technology: Wired
• Application: 1000BASE-SX
• Data Transfer Rate: 1Gbps
• Wavelength: 850nm
• Max Distance: 550m
• Fiber Type: MMF
• Connector: Duplex LC
• DDM: Without DDM
• Operating Temperature: 0~70 °C

SFP-GE-S Specifications

• Form Factor: SFP
• Device Type: Transceiver module
• Interface (Bus) Type: Plug-in module
• Connectivity Technology: Wired
• Application: 1000BASE-SX
• Data Transfer Rate: 1Gbps
• Wavelength: 850nm
• Max Distance: 550m
• Fiber Type: MMF
• Connector: Duplex LC
• DDM: with DDM
• Operating Temperature: 0~70 °C

So the only different between the GLC-SX-MM and SFP-GE-S is that: SFP-GE-S with DDM function ,GLC-SX-MM without DDM function