Product
1G SFP Fiber Optic Transceiver Module 1550nm 120km Duplex LC SMF DDM
1.25G SFP Duplex 1550nm 120km- Model reference
- SG-SMD-120
- Data rate
- 1G
- Wavelength
- 1550 nm
- Reach
- 120KM
- Form factor
- SFP
Key specifications
Original part-number references
These references compare optical specifications. Confirm the host device, firmware and coding profile before deployment.
| Brand | Original part number | Model reference | Optical specification reference | Next step |
|---|---|---|---|---|
| PLANET | MGB-L120 | SG-SMD-120 | PLANET 1000BASE-LX SFP transceiver, 1550 nm, 120 km over single-mode fiber, dual LC/UPC, with DDM. MGB-Series 1000BASE-SX/LX SFP TransceiverReviewed 2026-08-17 | Specification matchCheck host compatibility |
| ALLIED TELESIS | AT-SPZX120/I | SG-SMD-120 | Allied Telesis industrial 1000ZX SFP transceiver, 1550 nm, 120 km over single-mode fiber, LC connector, with DDM. SP Series SFP Transceiver Modules Data SheetReviewed 2026-08-17 | Specification matchCheck host compatibility |
Compatibility matching
Compatible with a wide range of major network brands.
Send the host device brand, model and link requirements so we can match an appropriate option.Applications
Review where this product fits the link design.
Confirm the host port, fibre or cable path, distance and operating environment before selecting the final variant.
- Endpoint fitHost device, port role and remote-end interface
- Link fitRate, reach, wavelength, fibre and connector
- Project fitEnvironment, quantity and document requirements
Testing evidence
Request evidence against the exact product scope.
Available evidence depends on the model and agreed review scope. Ask for the checks needed by engineering or procurement before approving a sample or rollout.
- Product identityModel, label, connector and wavelength details
- Host contextCoding or recognition evidence where applicable
- Output evidenceOptical, diagnostic or link information where available
Product datasheets
Review the document for the exact model.
Review the document for the exact model and reach before approving a sample or rollout.
Download SG-SMD-120 specification (PDF)Related questions
Five answers for this product path.
Product selectionHow can I identify the correct form factor?
Check the device manual and the marking on the existing module or cable. SFP, SFP+, SFP28, QSFP+, QSFP28, QSFP-DD and OSFP are not interchangeable merely because their connectors look similar.
Browse productsCompatibility & codingWill DOM or DDM readings be available on the host?
They are available only when the module, interface and host software support the diagnostic functions and expose them correctly. Confirm the required readings as part of the device review.
Start a model reviewOptical link designCan temperature influence optical margin?
Optical output, receiver performance and fibre or connector conditions can vary with environment. Use the specified operating range and retain reasonable link margin for the deployment.
Use the selection guideHigh-speed deploymentHow do I choose between parallel and duplex high-speed optics?
Compare the host-supported standards, installed fibre, connector, reach and migration plan. Parallel optics often use MPO/MTP; duplex solutions use LC but may have different optical and FEC requirements.
Plan a technical reviewDocuments & procurementHow do I make sure a document applies to my exact model?
Compare the model reference, interface, reach and variant with your product shortlist. If the document is not published or the revision is unclear, send the model and required document type through the document request form before using it for approval.
Request a document pack