25G SFP28 SR (100m) Optical Transceiver Module
Product Overview
The Apex 25G SFP28 SR module is the short reach 25 Gigabit interface for multimode fiber. An 850nm VCSEL transmitter and PIN receiver carry 25GBASE-SR over 100m of OM4 or 70m of OM3, which covers top of rack, row and in-hall runs inside the data centre.
Most 25G ports in a server hall are SR ports. The switch leaf, the server adapter and the storage controller sit in the same room, the cabling is multimode MPO to LC breakout or LC duplex patch cords, and the 100m budget is enough for the longest run in the row. That makes SR the highest volume 25G part and the one most often replaced in a hurry.
Every module is burnt in and tested for optical power, extinction ratio and error rate, reports live readings through DDM and is coded for the host platform you name. Duplex LC and MPO breakout versions are available, and LR, ER, BiDi, CWDM and DWDM 25G parts come from the same line when a link has to leave the hall.
Key Features
- 25.78Gbps line rate compliant with 25GBASE-SR
- 850nm VCSEL transmitter with PIN receiver
- 100m over OM4 and 70m over OM3 multimode fiber
- SFP28 MSA hot pluggable package, duplex LC interface
- MPO to LC breakout cords and patch cords available with the module
- Digital Diagnostic Monitoring (DDM/DOM) with live optical readings
- Low power consumption, single 3.3V supply
- Held in stock for same day quoting, coded for your platform, RoHS compliant
Technical Specifications
| Specification | Detail |
|---|
| Part Number | APX-SFP28-25G-100M-SR |
| Manufacturer | Apex |
| Data Rate | 25.78Gbps (also 24.33Gbps for CPRI options 7 and 8) |
| Form Factor | SFP28, hot pluggable |
| Standard | 25GBASE-SR |
| Wavelength | 850nm |
| Maximum Reach | 100m OM4, 70m OM3, 33m OM2 |
| Fiber Type | Multimode Fiber (MMF) |
| Connector Type | LC duplex |
| Transmitter | 850nm VCSEL |
| Receiver | PIN photodiode |
| DDM / DOM | Supported |
| Compliance | SFP28 MSA, IEEE 802.3by, RoHS |
| Temperature | 0 to 70C commercial, -40 to 85C industrial on request |
Applications
Top of Rack and Server Links
Connects 25G server adapters, storage controllers and top of rack switches on the multimode patch cords already installed in the hall.
Leaf Spine Fabric Uplinks
Provides the 25G uplink from a top of rack or row switch into the leaf layer inside the 100m multimode budget.
Small Room and Cabinet Links
Reaches between racks, adjacent rooms and small equipment spaces at 25G without changing the cabling to single mode.
Compatibility
25G SFP28 SR modules are coded to the host platform you specify, including 25G switches, server adapters, storage systems and NIC cards, and are tested on live ports before shipment. Reach depends on the fiber grade and on the connector and patch cord quality, so on runs close to the limit we confirm the fiber type and the measured loss before quoting. Where the link leaves the hall, LR and ER grades from the same line take over.
Related Products
Frequently Asked Questions
How far does a 25G SR module reach?
100m over OM4 multimode, 70m over OM3 and about 33m over older OM2 cable. For runs beyond that the link has to move to single mode LR, ER or BiDi parts.
SR or LR for a 25G server port?
Inside the hall on multimode, SR is the standard and the cheaper choice. If the span leaves the building or the cable is single mode, order LR at 10km instead.
Can a 25G SR module run on single mode fiber?
No. SR is an 850nm multimode interface and needs multimode fiber at both ends. Single mode spans use LR, ER or ZR grades.
Are 25G SR modules in stock?
Yes. The 850nm SR grade is held in stock in commercial and industrial temperature versions and is quoted the same day.
Why Choose Apex
- Optical engineering support and supply from 1.25G to 800G, including the full 25G SFP28 range.
- Stock on the SR grade so data centre replacements ship without a long lead time.
- Every module is tested for optical power, extinction ratio and error rate before shipment.
- Backed by a 3 year warranty and technical support before and after the sale.
