1000BASE-LX SFP 20km Industrial Transceiver: 1.25G-SFP-20DI
1.25G 1000BASE-LX 20 km Industrial SFP Overview
The EdgeOptic 1.25G-SFP-20DI is the industrial-temperature variant of the 1000BASE-LX 20 km SFP family, qualified across a −45 to +85 °C operating range for outdoor cabinets, transportation infrastructure, utility substations, and unconditioned industrial enclosures. The module operates at 1310 nm over duplex single-mode fiber with LC/UPC connectors, carries a 13 dB link budget, and ships with DDM/DOM diagnostics, INF-8074i SFP MSA conformance, and Class 1 laser safety compliance for Gigabit Ethernet and 1G Fibre Channel transport.
- Media Type: Single-Mode Fiber (SMF)
- Fiber Count: Duplex
- Connector: Double LC/UPC
- Maximum Distance: 20 km
- Average Link Budget: 13 dB
- Tx Wavelength: 1310 nm
- Supported Data Rate: 1.063 Gbps - 1.25 Gbps
- DDM/DOM: Supported
- Temperature Range: Industrial -45°C - +85°C
1000BASE-EX 20km Industrial Pricing
SKU:1.25G-SFP-20DI
In Stock - Ships Next Business Day1000BASE-LX SFP 20km Industrial Transceiver Specification
Form Factor | SFP |
Media Type | Single-Mode Fiber (SMF) |
Fiber Count | Duplex |
Connector | Double LC/UPC |
Maximum Distance | 20 km |
Average Link Budget | 13 dB |
TX Wavelength | 1310 nm |
RX Wavelength | 1310 nm |
Supported Data Rate | 1.063 Gbps - 1.25 Gbps |
Supported Ethernet Applications | Gigabit Ethernet (1.25 Gbps) |
Supported Fiber Channel Applications | 1G Fiber Channel (1.0625 Gbps) |
DDM/DOM | Supported |
Tx Wavelength Bandwidth | 100 nm (1260-1360 nm) |
Rx Wavelength Bandwidth | 100 nm (1260-1360 nm) |
Minimum Transmitting Power | -9 dBm |
Maximum Transmitting Power | 3 dBm |
Receiver Sensitivity | -22 dBm |
Receiver Overload | -3 dBm |
Dispersion | 140-160 ps/nm ps/nm |
Transmitter Type | FP Laser |
Receiver Type | PIN photodiode |
Temperature Range | Industrial -45°C - +85°C |
Power | +3.3V single power supply |
Compliance | CE, Class 1 FDA and IEC60825-1 Laser Safety Compliant, INF-8074i, RoHS, SFP MSA |
1000BASE-LX SFP 20km Industrial Transceiver Datasheet
v2Complete technical specifications and product details
1000BASE-LX SFP 20km Industrial Transceiver Description
The EdgeOptic 1.25G-SFP-20DI is the industrial-temperature 1000BASE-LX-class SFP in the 1.25G-SFP-20D family, qualified from −45 to +85 °C and rated for 20 km of duplex single-mode fiber at 1310 nm. The module uses an FP-laser transmitter and a PIN-photodiode receiver, presents a duplex LC/UPC optical interface, and supports 1.25 Gbps Gigabit Ethernet plus 1.0625 Gbps 1G Fibre Channel.
Transmit power lands between −9 dBm and +3 dBm, receive sensitivity is −22 dBm, and receiver overload is rated at −3 dBm, yielding a 13 dB link budget across the 1260 to 1360 nm wavelength window. The higher industrial maximum transmit power means very short spans approaching zero loss should use an in-line optical attenuator to keep received power below the −3 dBm overload threshold. DDM/DOM diagnostics expose transmit and receive power, module temperature, bias current, and supply voltage. The optic conforms to INF-8074i and SFP MSA on the host side, runs from a single +3.3 V rail, and carries CE, RoHS, and Class 1 laser safety (FDA and IEC 60825-1) compliance. IEEE 802.3z Clause 38 covers the 1000BASE-LX Gigabit Ethernet PHY; the 20 km reach is a vendor-extended figure beyond the 5 km IEEE-defined SMF distance for 1000BASE-LX.
The −45 to +85 °C operating range targets deployments outside conditioned data-center environments: outdoor street cabinets, roadside and trackside transportation enclosures, utility substations, oil and gas installations, and industrial-automation cells where ambient temperatures swing well outside the commercial 0 to +70 °C class. The 13 dB link budget reduces the available loss margin by 2 dB versus the commercial 1.25G-SFP-20D, so long spans approaching 20 km should be validated against a measured link-loss budget before deployment.
The 1.25G-SFP-20DI shares the same 1310 nm 20 km SMF optical class as the commercial 1.25G-SFP-20D, specified and qualified across −45 to +85 °C instead of the commercial 0 to +70 °C window. The same multi-vendor EEPROM coding model applies; order the optic with Cisco, HPE Aruba, Juniper, Hirschmann, Moxa, or other host-vendor codes to satisfy chassis transceiver checks in mixed industrial fleets.
Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms. The 1.25G-SFP-20DI ships next business day from EU stock with a lifetime warranty. For volume pricing, vendor-coding requests, or industrial deployment questions, contact our sales team.
Frequently Asked Questions
When should I order the industrial 1.25G-SFP-20DI instead of the commercial 1.25G-SFP-20D?
Use the 1.25G-SFP-20DI whenever the optic sits in an enclosure where ambient temperatures fall below 0 °C or rise above 70 °C. The commercial 1.25G-SFP-20D is rated 0 to +70 °C; the industrial 1.25G-SFP-20DI is rated −45 to +85 °C. Typical industrial placements include outdoor street cabinets, trackside and roadside transportation enclosures, utility substations, oil and gas installations, and industrial-automation cells. Indoor data-center and conditioned MDF/IDF deployments do not require the industrial variant; the commercial 1.25G-SFP-20D is the lower-cost choice for those environments. Both modules share the same 1310 nm 20 km SMF optical class and the same vendor-coding options.
Does the 13 dB link budget on the industrial variant reduce the usable distance versus the 15 dB commercial module?
Both modules are rated to 20 km maximum reach on duplex single-mode fiber. The 13 dB industrial budget is 2 dB tighter than the 15 dB commercial budget, so the difference shows up as less available margin for connector loss, splice loss, and fiber aging on long spans. For runs approaching the full 20 km, calculate the total optical path loss (fiber attenuation at 1310 nm plus connector and splice loss) and confirm it stays inside 13 dB before deployment. Short and mid-range spans well below 20 km absorb the 2 dB difference comfortably.
Is the lower temperature bound −40 °C or −45 °C?
The 1.25G-SFP-20DI is qualified to −45 °C on the cold end, 5 °C below the −40 °C floor that most catalogs use as shorthand for the industrial temperature class. The full rated operating window is −45 to +85 °C. For extreme cold-climate outdoor enclosures where ambient temperatures routinely fall below −40 °C, the additional 5 °C of headroom matters; the module continues to meet its optical parameters down to the −45 °C boundary.