MikroTik S-31DLC40D Compatible 1000BASE-EX SFP 1310nm 40km DDM Duplex LC/UPC SMF Optical Transceiver Module

The HYTOPTODEVICE S-31DLC40D compatible SFP is 100% verified for compatibility with:

• MikroTik CCR Series: CCR1009, CCR1016, CCR1036, CCR1072, CCR2004.

• MikroTik CRS Series: CRS125, CRS305, CRS317, CRS326, CRS328, CRS354.

• MikroTik RouterBoard (RB): RB2011, RB3011, RB4011, RB5009 series.

• MikroTik CSS Series: CSS326, CSS610 (Cloud Smart Switches).

• MikroTik Fiber-to-the-Home (FTTH): NetPower series and various outdoor wireless G-SFP stations.

• WISP Backhaul: Connecting remote wireless towers or base stations over a 40km single-mode fiber span.

• Campus & Municipal Fiber: Linking separate government buildings or school districts using existing 1310nm single-mode infrastructure.

• ISP Aggregation: Serving as a reliable 1.25G uplink for regional Internet Service Providers in high-traffic environments

FAQ for MikroTik S-31DLC40D Compatible SFP Transceiver:

Q1: Why must I use an attenuator for short-distance testing? Will it burn the module? A: This is the most critical precaution for 40km modules. These optical transceivers use high-power lasers designed to overcome fiber loss over long distances.

• The Risk: If you connect a 40km module using a short fiber patch cord (less than 5km) without an attenuator, the optical power will overwhelm the receiver, potentially leading to "saturation" or permanent physical damage to the optical components.

• Recommendation: Always use a 10dB LC Optical Attenuator when testing in a lab or for short-range links.

Q2: Will this module trigger "Third-Party/Unsupported" warnings on my switch? A: Not with HYTOPTODEVICE. We specialize in brand-specific coding.

• By matching the EEPROM signature to your specific brand (Cisco, Huawei, Juniper, etc.), our modules are recognized as "Original Compatible" or "Certified."

• They support Plug-and-Play functionality without requiring special CLI commands to bypass port locks or generating annoying system logs.

Q3: 1310nm 40km vs. 1550nm 40km—which one should I choose? A: It depends on your current fiber infrastructure and budget:

• 1310nm (EX/LH): The most cost-effective and common choice for 40km reaches. It works seamlessly with standard Single-mode Fiber (G.652).

• 1550nm (XD): 1550nm has lower attenuation but higher dispersion. These modules are typically more expensive and used only if your 1310nm signal is struggling due to poor fiber quality.

• Verdict: For a standard 40km link, 1310nm is the industry standard for price-to-performance.

Q4: Can I plug this 1G SFP into a 10G SFP+ port? A: In most cases, yes.

• Most 10G SFP+ ports on modern switches (e.g., Cisco Catalyst, Netgear M4300, FS) are backward compatible with 1G SFP modules.

• Pro Tip: If the link does not come up immediately, you may need to manually configure the port speed to 1000Mbps using the command speed 1000, as some 10G ports do not auto-negotiate with 1G modules.

Q5: MikroTik S-31DLC40D not working？ A:Follow these quick steps:

1. Check DDM: Run show transceiver detail on the switch. Look for Low Rx Power or faults.

2. Clean & Reseat: Clean the LC fiber connectors and firmly re-seat the SFP module.

3. Verify Fiber: Ensure you are using a single-mode (SMF) patch cable. Check for bends or breaks.

4. Swap Test: If possible, test the SFP in a different port or swap it with a known-working module to isolate the fault.

If DDM shows "Low Tx Power" or "Fault", the module is likely defective and needs replacement

Quality Assurance：Your Trusted Optical Transceiver Source

HYTOPTODEVICE is a vertically integrated manufacturer of high-performance optical transceivers. By controlling core materials at the source, we ensure every SFP module meets the highest standards of reliability and customization.

• Vertical Integration: In-house core material production ensures a stable, self-sufficient supply chain for all optical modules.

• Total Traceability: End-to-end oversight from raw components to final transceiver assembly guarantees 100% controllability.

• Bespoke Solutions: Expert-led R&D provides customized SFP transceiver designs tailored to your specific technical needs.

• 24-Hour Response: Our technical team guarantees a primary response to any inquiry or quality concern within 24 hours.

Carrier-Grade Quality. Factory-Direct Control. Rapid Response.

Quality Certification & Compliance：

At HYTOPTODEVICE, our quality commitment is backed by industry-standard validations. From fiber optical transceiver manufacturing to final inspection, our processes ensure global compliance and reliability.

We adhere to rigorous standards for our SFP modules and network solutions:

• ISO 9001: Certified quality management and production consistency.

• CE,UL & FCC: Fully compliant for seamless Global Market Access.

• RoHS: Committed to environmental responsibility and hazardous material control.

• Proven Reliability: Rigorous testing to reduce compliance risk and ensure safety.

Certified Quality. Global Standards. Guaranteed Performance.

Rigorous Industrial Product Testing：

   

100% 3rd Party Compatible：

Partial Test Demonstration: