1.25G SFP EX 40km Optical Transceiver Module
Product Overview
The Apex 1.25G SFP EX module is the extended reach Gigabit optic for spans that are too long for a 10km LX link but do not need the 1550nm transmitter of an 80km ZX part. A 1310nm DFB laser and a sensitive receiver give it a 40km reach on standard single mode fiber.
40km is a common distance in practice: it covers a campus to a metro point of presence, two sites across a city, or a utility substation on the edge of the network. Because the module stays on the 1310nm window, it has low chromatic dispersion on the span and does not need the dispersion compensation planning that 1550nm links sometimes require.
The module follows the SFP MSA hot pluggable footprint, so it fits the same cages as the rest of the Gigabit line, reports digital diagnostics over DDM, and is coded for the host platform you specify. 1.25G EX is supplied with duplex LC connectors and is available in commercial and industrial temperature grades.
Key Features
- 1.25Gbps line rate for Gigabit Ethernet and SDH STM-1 / OC-3
- 1310nm DFB transmitter for stable 40km operation
- SFP MSA hot pluggable package
- 40km reach over standard single mode fiber
- Duplex LC interface
- Digital Diagnostic Monitoring (DDM/DOM) for live optical readings
- Commercial 0 to 70C and industrial -40 to 85C grades
- RoHS compliant, coded for your platform before shipment
Technical Specifications
| Specification | Detail |
|---|
| Part Number | APX-SFP-1.25G-40km-EX |
| Manufacturer | Apex |
| Data Rate | 1.25Gbps |
| Form Factor | SFP, hot pluggable |
| Optical Technology | Extended reach, single channel |
| Wavelength | 1310nm DFB |
| Maximum Reach | 40km over SMF |
| Fiber Type | Single Mode Fiber (SMF) |
| Connector Type | LC duplex |
| DDM / DOM | Supported |
| Power Supply | 3.3V |
| Compliance | SFP MSA, RoHS |
| Temperature | 0 to 70C commercial, -40 to 85C industrial |
Applications
Campus to Metro Links
Connects a campus or enterprise site to a carrier point of presence 40km away on a single mode fiber pair without moving to a 1550nm or amplified design.
Utility and Industrial Rings
Carries protection and telemetry channels between substations and control centres where spans run well beyond the 10km reach of a standard LX module.
Mobile and Fixed Access Backhaul
Links remote access nodes to aggregation sites at a reach that sits between the short haul and long haul Gigabit optics.
Compatibility
The 1.25G EX module is coded for the switch, router or OLT platform you name and tested on live ports before shipment. It interoperates with the rest of the Gigabit line, so a mixed fleet of SX, LX, EX and ZX modules can be deployed on the same network with consistent diagnostics and labelling.
Related Products
Frequently Asked Questions
What is the difference between 1.25G SFP LX and EX?
Both use a 1310nm transmitter, but LX is specified to 10km and EX to 40km, with a higher output power and a more sensitive receiver to close the longer optical budget.
Is 1.25G EX a standard interface?
EX follows the SFP MSA footprint and the 1.25G line rate, and 40km on 1310nm is a widely deployed extended reach design. It is coded for the host platform you name so it behaves as the original port expects.
Can I mix EX and LX modules on the same link?
No. Both ends of a link should use the same reach class, otherwise the optical budget and the receiver sensitivity no longer match. We quote matched pairs for each span.
How do I know the module will work over my span?
Send us the fiber route length, the splice and patch count, and we will check the optical budget against the module ratings before shipping. We recommend a test report for spans over 35km.
Why Choose Apex
- Optical engineering support and supply from 1.25G to 800G, including extended reach and long haul lines.
- Optical budget checked against your span before the order ships.
- Every module is tested for optical power, error rate and interoperability before shipment.
- Backed by a 3 year warranty and technical support before and after the sale.
