Cisco C20 Compatible 25G SFP28 Transceiver Module
The C20 compatible module serves equipment requiring a 25G SFP28 interface with 1561.42nm optics and a 10km rating. Connection is through Duplex LC. Product data, application guidance and factory verification are presented together to support field technicians install, maintain and identify the exact compatible module.
OEM Part Number: C20HT Part Number: DW-SFP25G10-20-I
Product Highlights
- Compatible alternative to Cisco C20
- 25G connectivity at 25.78Gbps
- Optical wavelength: 1561.42nm
- Specified reach: 10km
- Duplex LC / SMF interface
- Digital diagnostic monitoring: Supported
- Operating temperature: -40 to 85°C (-40 to 185°F)
Specifications
| HT Part Number | DW-SFP25G10-20-I |
|---|---|
| Manufacturer | HT |
| Form Factor | SFP28 |
| Max Data Rate | 25.78Gbps |
| Wavelength | 1561.42nm |
| Max Cable Distance | 10km |
| Connector | Duplex LC |
| Media | SMF |
| Transmitter Type | EML |
| Receiver Type | APD |
| TX Power | 0~5dBm |
| Receiver Sensitivity | ＜-14dBm |
| Power Budget | 14dB |
| Receiver Overload | -5dBm |
| Power Consumption | ≤2W |
| Extinction Ratio | ＞6dB |
| DDM/DOM | Supported |
| Industrial Temperature Range | -40 to 85°C (-40 to 185°F) |
| CDR (Clock and Data Recovery) | TX and RX |
| FEC Function | Not Supported |
| Protocols | SFF-8431, SFF-8472, RoHS |
Field Installation and Maintenance
Inspect the connector and patch lead before installation, then support the fiber without pulling on the module housing. Release the latch properly during maintenance and keep dust protection on unused interfaces. If a module is removed for later use, retain its part-number label and record its original port. For this model, the principal parameters are data rate 25.78Gbps, wavelength 1561.42nm, rated reach 10km.
Applications and Optical Link Design
Use this module for equipment interconnection over the specified single-mode fiber plant, including enterprise backbone, campus, metro or data-center interconnect links according to its rated distance. Confirm that both ends use the same optical standard and wavelength plan, and allow for connector, splice and patch-panel loss within the stated power budget.
The industrial temperature rating makes this version appropriate for controlled outdoor cabinets, transport nodes and other installations exposed to wider ambient temperature variation. Adequate airflow, protected cable routing and host-platform temperature limits still apply.
For this 1561.42nm interface, verify channel spacing and filter compatibility. Passive filters add loss even without active equipment, so assess 10km using the complete channel rather than fiber distance alone.
Optical Acceptance, Diagnostics and Handling
For this model, the specified transmit-power range is 0~5dBm; receiver sensitivity is ＜-14dBm; the stated optical power budget is 14dB. 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.
Quality Assurance and Packaging
Before packing, the module receives interface inspection, identification and link checks. Protective packaging avoids pressure on the connector and latch. Customer references, rack groups and project packing lists can be added for volume orders.
Cisco Compatibility and Factory Testing
Compatibility testing for C20 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.
Frequently Asked Questions
Is this an original Cisco transceiver?
No. It is an HT-manufactured compatible alternative for equipment that specifies C20, not an original Cisco-branded module.
Which fiber and connector are required?
Use Duplex LC with SMF. The specified maximum reach is 10km, 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.
Ordering Information
When ordering, specify C20, DW-SFP25G10-20-I, quantity and intended host platform. Project labels can repeat these details for receiving and asset records. Neutral labels, customer packaging and project-specific compatibility review are available on request.
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.
