Juniper EX-SFP-1GE-LX40K Compatible 1000BASE-EX SFP Transceiver Module (SMF, 1310nm, 40km, LC, DOM)
This Juniper EX-SFP-1GE-LX40K compatible SFP module supports 1000BASE-EX Gigabit Ethernet connectivity and 1G fiber channel application. Featuring 1310nm wavelength, it supports a link distance of 40km over LC duplex single mode fiber (SMF). This 1G SFP transceiver complies with the SFP MSA, IEEE 802.3z, and SFF-8472 standards, making it suitable for any MSA-compliant equipment. Instead of an OEM supplier, it is produced by a third-party manufacturer, OPTCORE. Hence, this SFP offers a very affordable price compared to the original EX-SFP-1GE-LX40K. Most importantly, we code and test each transceiver to ensure it works with the Juniper Gigabit Ethernet switches, routers, servers, and network interface cards (NICs).
Features

Proven Performance
When performance and reliability are vital, use our 1G SFP module to build your network. OPTCORE transceivers are engineered, produced, and tested in-factory for reliable end-to-end quality.

Proven Compatibility
There’s an easy way to verify compatibility: test in real network devices. The OPTCORE SFP transceiver is tested for compatibility with multi-switch devices to ensure flawless functioning.

Enjoy Massive Saving
Compared to the original transceiver, the OPTCORE 1G SFP module can save you up to 80% on project and optical networking cabling. You won't find a better combination of quality and affordability.
Specifications
Compatible OEM Part# | EX-SFP-1GE-LX40K | Manufacturer | OPTCORE |
Manufacturer Part# | OSP1250-3140DCR | Form Factor | SFP |
Data Rate | 1.25 Gbps | Wavelength | 1310 nm |
Media Type | SMF | Max Distance | 40 km |
Transmitter Type | DFB | Receiver Type | PIN |
Transmitter Power | -5 ~ 0 dBm | Receiver Sensitivity | < -24 dBm |
Extinction Ratio | > 9 dB | Receiver Overload | > 0 dBm |
Connector | LC Duplex | Power Consumption | 0.9 W |
DDM/DOM | Yes | Compliance | RoHS, CE, REACH SFP MSA(INF-8074i), IEEE 802.3z, SFF-8472 |
Environment | Operating Temperature: 0~70°C Storage Temperature: -40~85°C |
Application | Gigabit Ethernet 1G Fibre Channel Switch to Switch Interface Switch to NIC or Media Converter Interface Other 1G Optical Links |
Shipping Weight | 0.03 kg | Dimensions (LxWxH) | 55.5×13.7×12 mm |
Receiver sensitivity measured with a PRBS 27-1 test pattern @1.25Gbps, Bit Error Ratio (BER) ≤1E-12.
Application Diagram

Gigabit Ethernet Switch
SFP-1G-EX
FOC-125
LC-LC-SM-DX
SFP-1G-EX
Gigabit Switch (48xRJ45, 4xSFP)

Gigabit Ethernet Switch
SFP-1G-EX
LC-LC-SM-DX
SFP-1G-EX
1G SFP Converter
Cat6 Cable
Gigabit Switch
Key Features
Intelligent DOM/DDM for Reliable Networks
With built-in DOM/DDM function, the 1G SFP module allows users to monitor the fiber link operating parameters in real-time. That ensures a reliable optical network and helps locate network problems quickly.
Optimal Performance and Quality for 1G Networks
Featuring a built-in Semtec chip and reliable DFB laser / PIN receiver, the SFP module delivers low power consumption and stable optical links for 1G single mode networks like Gigabit Ethernet and Fibre Channel. You can rest assured regarding quality and warranty.

Compatibility
- EX2200 Ethernet Switches - EX2200-24P-4G
- EX2200 Ethernet Switches - EX2200-24T-4G
- EX2200 Ethernet Switches - EX2200-48P-4G
- EX2200 Ethernet Switches - EX2200-48T-4G
- EX2300-24T
- EX2300-24P
- EX3300 Ethernet Switch-EX3300-24T
- EX3300 Ethernet Switch-EX3300-48T
- EX3300 Ethernet Switch-EX3300-48T-BF
- EX3300 Ethernet Switch-EX3300-24P
- EX3300 Ethernet Switch-EX3300-48P
- EX3300 Ethernet Switch-EX3300-24T-DC
- EX3400-24P
- EX3400-24T-DC
- EX3400-48T
- EX3400-48T-AFI
- EX3400-48P
- EX4200-24T
- EX4200-24P
- EX4200-24PX
- EX4200-48T
- EX4200-48P
- EX4200-48PX
- EX4200-24F
- EX4200-24T-DC
- EX4200-48T-DC
- EX4200-24F-DC
- EX4300-24P
- EX4300-48T
- EX4300-48P
- EX4300-48T-AFI
- EX4300-48T-DC
- EX4300-48T-DC-AFI
- EX4300-32F
- EX4300-32F-DC
Note: All trademarks, products, and company names mentioned are the property of their respective owners and are used for comparative purposes only. This product is NOT certified or endorsed by Juniper.
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