Walsun 25G SFP28 ER 40KM Transceiver Module

About Walsun 25G SFP28 ER 40KM Optical Transceiver Module in Bangladesh

The Walsun 25G SFP28 ER 40KM is a long-distance 25Gbps optical transceiver designed for high-speed Ethernet connectivity over single-mode fiber. It operates at 1310nm and supports transmission distances of up to 40km, making it suitable for enterprise backbone networks, data center interconnects, metro Ethernet, telecom infrastructure and long-distance 25GbE links.

Walsun's official product page identifies the 40km variant as HXSX-FL341C/I. The module uses a 1310nm DML laser transmitter and APD receiver, with a transmit-power range of -3.0 to +6.0dBm and receiver sensitivity better than -14dBm. It supports digital diagnostics, a hot-pluggable SFP footprint and 0°C to 70°C / -40°C to 85°C operating-temperature variants. Walsun official 25G SFP28 ER 40KM specifications

Walsun 25G SFP28 ER 40KM Specifications & Features

Overview

The Walsun 25G SFP28 ER 40KM provides high-bandwidth 25GbE optical connectivity across distances of up to 40km. Its compact SFP28 form factor enables high port density while its 1310nm single-mode optical design is optimized for extended-distance network links.

Walsun identifies the 25G SFP28 ER as a conventional dual-fiber ER optical module and separately offers BIDI, CWDM, MWDM, DWDM and tunable 25G SFP28 products. Walsun 25G SFP28 product family

Buy Walsun 25G SFP28 ER 40KM in Bangladesh

Purchase the Walsun 25G SFP28 ER 40KM Optical Transceiver Module from Datacom Technologies (BD). We supply Walsun 25G SFP28 optics, long-distance optical transceivers, CWDM/DWDM modules, fiber networking equipment and enterprise/data center connectivity solutions throughout Bangladesh.

Key Features

• 25Gbps high-speed optical connectivity
• 40km transmission distance
• 1310nm optical wavelength
• 9/125µm single-mode fiber
• Duplex LC optical connector
• DML laser transmitter
• APD receiver
• -3.0 to +6.0dBm transmit power
• Receiver sensitivity below -14dBm
• Digital Diagnostic Monitoring
• Hot-pluggable SFP28 form factor
• +3.3V single power supply
• SFF-8472 management interface
• Class 1 laser safety
• Commercial and industrial temperature options
• RoHS-10 compliant and lead-free

25G SFP28 ER Long-Distance Optical Technology

The 25G SFP28 ER is designed for extended-distance 25GbE connections. Compared with short-range SR optics and standard 10km LR modules, the ER version provides substantially greater reach for networks that require connections across campuses, metro areas or geographically separated facilities.

Walsun specifies the ER module for up to 40km on 9/125µm single-mode fiber. Walsun official specifications

1310nm Single-Mode Fiber

The Walsun 25G SFP28 ER 40KM operates at 1310nm and is designed for 9/125µm single-mode fiber.

1310nm optics are widely used for 25GbE long-distance applications because of their favorable fiber-loss and dispersion characteristics over the intended distance range.

40km Transmission Distance

The module supports up to 40km transmission over compatible single-mode fiber.

This reach makes it suitable for enterprise WAN links, metro Ethernet, campus backbone connections, data center interconnection and telecom access/aggregation networks.

The actual achievable distance depends on fiber attenuation, connector and splice losses, dispersion and the total optical power budget. The 40km rating should therefore be treated as a maximum specified reach under appropriate link conditions.

DML Transmitter and APD Receiver

The HXSX-FL341C/I 40km variant uses a DML laser transmitter and APD photodetector.

The DML transmitter provides the optical launch characteristics required for 25Gbps transmission, while the APD receiver provides enhanced sensitivity for extended-distance optical links.

Optical Performance

Walsun specifies a transmit-power range of -3.0 to +6.0dBm for the 40km variant and receiver sensitivity of < -14dBm. Walsun specifications

For final deployment, the optical link should be engineered using the exact module's optical budget together with fiber attenuation, connectors, splices and an appropriate system margin.

Duplex LC Optical Interface

The Walsun 25G SFP28 ER uses a duplex LC optical interface. One fiber is dedicated to the transmit path and the second fiber to the receive path.

Unlike a BIDI SFP28 module, this ER module requires a conventional two-fiber optical connection.

Digital Diagnostic Monitoring

The module provides integrated digital diagnostic capabilities through a 2-wire management interface compliant with SFF-8472.

When supported by the host networking platform, DDM can provide monitoring information such as module temperature, supply voltage, laser bias and optical transmit/receive power.

Hot-Pluggable SFP28 Design

The SFP28 form factor is hot-pluggable and enables network administrators to install or replace the transceiver in compatible switches, routers and network interface equipment without replacing the entire system.

Walsun also describes SFP28 as the standard form factor for 25G optical modules and notes that SFP28 uses the same general physical form factor as SFP+ while providing higher electrical bandwidth. Walsun 25G transceiver guide

25G SFP28 ER vs 25G SFP28 LR

Walsun's technical information identifies conventional 25G SFP28 LR modules as approximately 10km solutions and ER modules as approximately 40km solutions. Walsun 25G SFP distance guide

25G SFP28 ER vs 25G SFP28 CWDM

The conventional ER module is appropriate for straightforward point-to-point 25GbE connections, while CWDM modules are useful when multiple wavelengths must share the same fiber infrastructure.

Enterprise, Metro & Data Center Applications

• 25GbE data center interconnects
• Enterprise backbone networks
• Campus network aggregation
• Metro Ethernet
• Telecom access networks
• Server-to-switch long-distance links
• Switch-to-switch 25GbE connectivity
• High-capacity enterprise WANs
• Cloud infrastructure
• Network aggregation and distribution

Compatibility

Walsun offers its 25G SFP28 optical modules with compatibility options for different networking platforms. The exact vendor coding should be selected according to the target switch, router, NIC or optical transport platform.

Before purchasing, verify that the host equipment supports 25GbE SFP28 optics and the required 40km ER specification.

Installation Considerations

• Use compatible 9/125µm single-mode fiber.
• Use duplex LC fiber connectors.
• Verify the complete 40km optical link budget.
• Check fiber attenuation and dispersion.
• Account for connector and splice losses.
• Clean and inspect LC connectors before installation.
• Verify SFP28 host compatibility.
• Specify the required OEM coding when ordering.
• Confirm commercial or industrial temperature requirements.

Benefits

• 25Gbps high-speed optical networking
• Up to 40km single-mode fiber reach
• 1310nm operation
• DML transmitter
• APD receiver
• Duplex LC connectivity
• Digital Diagnostic Monitoring
• Hot-pluggable SFP28 design
• +3.3V operation
• Class 1 laser safety
• Commercial and industrial temperature variants
• Suitable for enterprise, metro and data center networks

Why Buy from Datacom Technologies (BD)?

Datacom Technologies (BD) supplies Walsun 25G SFP28 ER optical transceivers, 25G LR/CWDM/DWDM modules, enterprise networking optics, fiber products and data center connectivity solutions in Bangladesh. Customers can receive competitive pricing, technical consultation, compatibility guidance and nationwide delivery.

• Call/WhatsApp: +8801748173213
• Email: sales@datacomtechbd.com
• Alternative Email: datacomtechnologiesbd@gmail.com
• Office: Tropical Center, 218, Dr. Kudroti Khuda Road, New Elephant Road, Dhaka-1205, Bangladesh

Frequently Asked Questions (FAQ)

Q1: What is the Walsun 25G SFP28 ER 40KM?
It is a 25Gbps SFP28 optical transceiver designed for up to 40km single-mode fiber transmission.

Q2: What is the Walsun part number?
The official ordering information identifies the 40km variant as HXSX-FL341C/I.

Q3: What wavelength does it use?
The module operates at 1310nm.

Q4: What type of fiber does it require?
It requires 9/125µm single-mode fiber.

Q5: What connector does it use?
The module uses a duplex LC optical connector.

Q6: What is the maximum transmission distance?
The specified reach is up to 40km.

Q7: What transmitter and receiver does it use?
The 40km module uses a DML transmitter and APD receiver.

Q8: Does it support DDM?
Yes. Walsun specifies digital diagnostic capabilities through its 2-wire SFF-8472 management interface.

Q9: What is the transmit power?
The specified Tx power range is -3.0 to +6.0dBm.

Q10: What is the receiver sensitivity?
Walsun specifies receiver sensitivity of less than -14dBm.

Q11: Is the 25G SFP28 ER compatible with 10G?
The specific HXSX-FL341C/I variant is listed as a 25Gbps module. Walsun separately offers 10/25G dual-rate SFP28 variants, so dual-rate operation should not be assumed for this ER SKU without confirming the exact ordering code.

Q12: Where can I buy Walsun 25G SFP28 ER 40KM in Bangladesh?
You can contact Datacom Technologies (BD) for Walsun 25G SFP28 ER 40km optical transceivers, long-distance fiber modules and enterprise/data center networking solutions with nationwide delivery.