1.25G SFP SX 550m Optical Transceiver Module
Product Overview
The Apex 1.25G SFP SX module is the short reach Gigabit optic for multimode fiber. An 850nm VCSEL transmitter and a PIN receiver cover up to 550m on OM2, OM3 or OM4 multimode cable, which is the distance range of rack to rack, row to row and floor to floor links inside a building.
Multimode cable is already installed in most data centres and enterprise risers, so SX is usually the cheapest way to light a Gigabit port. There is no single mode splicing involved, connectors are standard LC duplex, and the modules can be deployed as fast as cages can be filled.
The standard SX part is held in stock for same day quoting and is coded for the switch platform you name. Cable grade matters at this reach, so we list the supported distances by fiber type and will confirm the right grade when you send the link schedule.
Key Features
- 1.25Gbps line rate for Gigabit Ethernet and SDH STM-1 / OC-3
- 850nm VCSEL transmitter for low cost short reach links
- Up to 550m over OM2, OM3 and OM4 multimode fiber
- SFP MSA hot pluggable package
- Duplex LC interface
- Digital Diagnostic Monitoring (DDM/DOM) for live optical readings
- Stocked for same day quoting
- RoHS compliant, coded for your platform before shipment
Technical Specifications
| Specification | Detail |
|---|
| Part Number | APX-SFP-1.25G-550m-SX |
| Manufacturer | Apex |
| Data Rate | 1.25Gbps |
| Form Factor | SFP, hot pluggable |
| Optical Technology | Short reach, duplex |
| Wavelength | 850nm VCSEL |
| Maximum Reach | 550m on OM2 and better, 220m on OM1 |
| Fiber Type | Multimode Fiber (MMF) |
| Connector Type | LC duplex |
| DDM / DOM | Supported |
| Power Supply | 3.3V |
| Compliance | SFP MSA, 1000BASE-SX, RoHS |
| Temperature | 0 to 70C commercial, -40 to 85C industrial on request |
Applications
Rack and Row Links
Connects servers and top of rack switches to aggregation switches inside the same hall on installed multimode cabling.
Building Riser Connections
Carries Gigabit uplinks between floors and between nearby buildings on multimode riser cable inside the 550m limit.
Industrial and CCTV Networks
Links cameras, controllers and switches in plants and warehouses where multimode cable is already run and short reach is enough.
Compatibility
SX modules are coded for the switch platform you name and tested on live ports before shipment. Because reach on multimode fiber depends on cable grade, we confirm the fiber type and length for each link and, where a run sits close to the limit, recommend OM3 or OM4 rather than leaving the link at the edge of its budget.
Related Products
Frequently Asked Questions
How far does a 1.25G SX module go?
550m over OM2, OM3 or OM4 multimode fiber and about 220m over older OM1 cable. Above that distance a single mode LX or EX module and single mode fiber are needed.
Can SX run on single mode fiber?
Not as a designed link. SX is an 850nm multimode optic, so on single mode fiber the budget is poor and the link is not specified. Use LX for single mode at 10km.
Which fiber grade should I choose?
OM3 or OM4 give the full 550m and more headroom for losses at patch panels. OM2 reaches the same 550m on paper but leaves less margin on a long run with several connectors.
Is SX the cheapest Gigabit optic?
Yes. Short reach 850nm multimode modules are the lowest cost Gigabit parts, provided the installed cable is multimode and the distance is inside the reach limit.
Why Choose Apex
- Optical engineering support and supply from 1.25G to 800G, including the full Gigabit reach range.
- Reach confirmed against your cable grade before shipment so links come up first 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.
