IBM BNT BN-CKM-S-SX Compatible 1000BASE-SX SFP Transceiver Module (MMF, 850nm, 550m, LC, DOM)
This IBM BNT BN-CKM-S-SX compatible SFP module supports 1000BASE-SX connectivity over multimode fiber cable (MMF). It supports a link distance of 550m via 50µm OM2 or 220m via 62.5µm OM1 fiber. This multimode transceiver module complies with SFP MSA, IEEE 802.3z, and SFF-8472, so it is suitable for any MSA-compliant equipment. Instead of an OEM supplier, it comes from OPTCORE, a third-party manufacturer. Hence, this SFP offers a very affordable price compared to the original BNT BN-CKM-S-SX. Most importantly, we code and test each transceiver to ensure it works flawlessly with the IBM 1G network 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# | BNT BN-CKM-S-SX | Manufacturer | OPTCORE |
Manufacturer Part# | OSP1250-8505DCR | Form Factor | SFP |
Data Rate | 1.25 Gbps | Wavelength | 850 nm |
Media Type | MMF | Max Distance | 1km@50/125µm OM3 550m@50/125µm OM2 [email protected]/125µm OM1 |
Transmitter Type | VCSEL | Receiver Type | PIN |
Transmitter Power | -9 ~ -3 dBm | Receiver Sensitivity | < -18 dBm |
Extinction Ratio | > 9 dB | Receiver Overload | > 0 dBm |
Connector | LC Duplex | Power Consumption | 0.8 W |
DDM/DOM | Yes | Compliance | RoHS, CE, REACH SFP MSA, 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 |
Application Diagram

Gigabit Ethernet Switch
SFP-1G-SX
FOC-125
LC-LC-OM2-D1M
SFP-1G-SX
Gigabit Switch (48xRJ45, 4xSFP)

Gigabit Ethernet Switch
SFP-1G-SX
LC-LC-OM2-D1M
SFP-1G-SX
1G SFP Converter
Cat6 Cable
Gigabit Switch

Gigabit Ethernet Switch
SFP-1G-SX
LC-LC-OM2-DX
SFP-1G-SX
NAS Server
Cat6 Cable
Desktop
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 VCSEL laser, the SFP module delivers low power consumption and stable optical links for 1G multimode networks like gigabit Ethernet & fibre channel. You can rest assured regarding quality and warranty.
Compatibility
- IBM Gigabit Ethernet Switches
- IBM Gigabit Ethernet Routers
- IBM Gigabit Ethernet Firewalls
- IBM Network Interface Card (NICs)
- IBM Gigabit Fiber Media Converters
- IBM Gigabit Fiber Mode Converters
- IBM Network Attached Storage (NAS)
- IBM 1G SAN Switches
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 IBM.
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