1.25G SFP LX 10km Optical Transceiver Module
Product Overview
The Apex 1.25G SFP LX module is the workhorse Gigabit optic: a 1310nm transmitter with a 10km reach over standard single mode fiber, and the part most often fitted when a fiber pair runs between two buildings, two racks in different halls, or a subscriber site and the nearest access node.
Because almost every Gigabit switch, router and media converter has an LX port or expects LX coding, this is the module that keeps spares simple. The same part can also drive multimode fiber over short distances with a mode conditioning patch cord, which helps when an older building has multimode cable left in place.
Each unit is hot pluggable, reports temperature, voltage and optical power through the DDM interface, and is coded for the host platform you specify. Commercial and industrial temperature grades are both available, and we hold stock on the standard 10km grade for same day quoting.
Key Features
- 1.25Gbps line rate for Gigabit Ethernet and SDH STM-1 / OC-3
- 1310nm transmitter, 10km reach over single mode fiber
- SFP MSA hot pluggable package
- Duplex LC interface
- Works with mode conditioning patch cords on multimode fiber
- 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-10km-LX |
| Manufacturer | Apex |
| Data Rate | 1.25Gbps |
| Form Factor | SFP, hot pluggable |
| Optical Technology | Single channel, duplex |
| Wavelength | 1310nm |
| Maximum Reach | 10km over SMF |
| Fiber Type | Single Mode Fiber (SMF), multimode with conditioning patch cord |
| Connector Type | LC duplex |
| DDM / DOM | Supported |
| Power Supply | 3.3V |
| Compliance | SFP MSA, 1000BASE-LX, RoHS |
| Temperature | 0 to 70C commercial, -40 to 85C industrial |
Applications
Building and Campus Backbone
Links switches between buildings or between floors on a single mode fiber pair with the standard 10km Gigabit interface.
Access and Subscriber Links
Carries Gigabit service from an access node to a business subscriber or a small cell site inside the 10km reach.
Media Conversion and Legacy Upgrades
Replaces aged Gigabit optics in media converters, routers and industrial switches where LX coding is expected.
Compatibility
1.25G LX modules are coded for the platform you name and tested before shipment, and they interoperate with SX, EX and ZX modules in the same line. Where existing racks run multimode fiber, we supply the mode conditioning patch cords together with the modules so the link comes up on the first attempt.
Related Products
Frequently Asked Questions
What is the reach of a 1.25G SFP LX module?
10km over standard single mode fiber, and 550m over multimode fiber when a mode conditioning patch cord is used at the transmit end.
Does LX work in an SX port?
The module fits the same cage, but the port must be configured and coded for the wavelength and reach in use. We code every unit to the platform you name so it comes up without manual intervention.
How many LX modules do I need for a link?
Two, one at each end. Both ends of a Gigabit link use the same reach class and the same wavelength, so LX pairs with LX and never with EX or ZX.
Do you hold stock on 1.25G LX?
Yes. The standard 10km LX grade is held in stock and quoted the same day, with industrial temperature and CWDM or DWDM alternatives available from the same line.
Why Choose Apex
- Optical engineering support and supply from 1.25G to 800G, including the full Gigabit reach range.
- Stock on the standard 10km grade, so urgent replacements ship without a long lead time.
- 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.
