Cisco SFP-10/25G-CSR-S Compatible 25G SFP28 CSR Transceiver Module
This Cisco SFP-10/25G-CSR-S compatible transceiver provides 25G connectivity in a hot-swappable SFP28 package. Its optical design operates at 850nm for up to 400m on OM4 / 300m on OM3, using Duplex LC. Complete parameters and related OEM references help procurement teams match an equipment parts list to a clearly defined optical product.
OEM Part Number: SFP-10/25G-CSR-SHT Part Number: SFP-25GMCSR-85
Product Highlights
- Compatible alternative to Cisco SFP-10/25G-CSR-S
- 25G connectivity at 25Gbps
- Optical wavelength: 850nm
- Specified reach: 400m on OM4 / 300m on OM3
- Duplex LC / MMF interface
- Operating temperature: 0 to 70°C (32 to 158°F)
- Factory compatibility verification and optical performance testing before shipment
Specifications
| Cisco Compatible | SFP-10/25G-CSR-S |
|---|---|
| Manufacturer | HT |
| HT Part Number | SFP-25GMCSR-85 |
| Form Factor | SFP28 |
| Max Data Rate | 25Gbps |
| Wavelength | 850nm |
| Max Cable Distance | 400m@OM4/300m@OM3 |
| Connector | Duplex LC |
| Media | MMF |
| Transmitter Type | VCSEL |
| Receiver Type | Pin |
| TX Power | -6.4~2.4dBm |
| Receiver Sensitivity | ＜-6dBm |
| Power Budget | -0.4dB |
| Receiver Overload | 2.4dBm |
| Power Consumption | ≤1W |
| Extinction Ratio | >2dB |
| CDR (Clock and Data Recovery) | TX and RX Built-in CDR |
| FEC Function | Support RS-FEC |
| Commercial Temperature Range | 0 to 70°C (32 to 158°F) |
| Protocols | SFF-8472, SFF-8024, SFF-8431, SFF-8432, IEEE802.3by |
| Core Size | 50/125 µm |
| Packaging Technology | COB Packaging |
| DOM | Supported |
Applications and Optical Link Design
Typical deployments include switch-to-switch, switch-to-server and aggregation links inside a data hall or between adjacent equipment rooms. The Duplex LC interface connects to the specified multimode cabling, and the stated reach depends on fiber grade and link loss. Keep this interface on the matching multimode optical standard rather than connecting it directly to a single-mode wavelength or reach variant.
Before deployment, check the host port type, supported data rate and firmware requirements. The 25G interface configuration must match the remote equipment; sharing a SFP28 housing alone does not make two transceiver types interoperable.
For this multimode module, confirm fiber grade, modal bandwidth and total loss before commissioning. The 400m on OM4 / 300m on OM3 figure applies only under suitable cabling conditions. Inspect every Duplex LC mating point and match the remote optical standard.
Optical Acceptance, Diagnostics and Handling
For this model, the specified transmit-power range is -6.4~2.4dBm; receiver sensitivity is ＜-6dBm; the stated optical power budget is -0.4dB. During commissioning, record the host diagnostic readings after the link has stabilized and compare them with those limits. DOM values are useful operational indicators, but they do not replace calibrated optical measurements when a link is marginal. Investigate unexpected loss through connector inspection, cleaning and a channel measurement before replacing the module. Diagnostic monitoring is listed as Supported. Before every insertion, keep dust caps in place until the patch lead is ready, avoid touching the optical end face and use an appropriate inspection and cleaning procedure. Do not look into an active optical interface.
Procurement and Asset Identification
A useful purchase order identifies the host platform, expected OEM code and optical standard separately. This prevents a module with the same housing but another wavelength, reach or identification profile from being substituted. For mixed deployments, keep one order line per OEM reference and reconcile each received unit with its intended port. For this model, the principal parameters are data rate 25Gbps, wavelength 850nm, rated reach 400m on OM4 / 300m on OM3.
Cisco Compatibility and Factory Testing
Compatibility testing for SFP-10/25G-CSR-S combines identification with a live link and available transmit, receive and alarm information. Connector condition is inspected separately. Equipment model, hardware revision and software release can be reviewed before dispatch where platform behavior is uncertain.
Ordering Information
Use SFP-10/25G-CSR-S as the compatibility cross-reference and SFP-25GMCSR-85 as the HT ordering identity. Keep other reaches or wavelength directions on separate order lines. Neutral labels, customer packaging and project-specific compatibility review are available on request.
Quality Assurance and Packaging
Each SFP-10/25G-CSR-S compatible module is inspected, powered up and functionally checked before protective packing. Dust caps and individual trays shield the interface during transport. Customer references, rack groups and project packing lists can be added for volume orders.
Frequently Asked Questions
Is this an original Cisco transceiver?
No. It is an HT-manufactured compatible alternative for equipment that specifies SFP-10/25G-CSR-S, not an original Cisco-branded module.
Which fiber and connector are required?
Use Duplex LC with MMF. The specified maximum reach is 400m on OM4 / 300m on OM3, subject to fiber quality and total link loss.
Can it be mixed with another wavelength or reach version?
Only when the two ends share the same optical standard, wavelength plan and supported data rate. Check the exact part numbers and link budget rather than relying only on the module form factor.
Shipping and Lead Time
Standard configurations normally ship within one to three working days, with production lead times confirmed for larger quantities. International courier, air freight and sea freight are available; customer courier accounts and nominated forwarders are accepted.