Extend Your Network Reach with SFP-FE-BX40D 155Mbps Bi-Directional SFP Fiber Transceiver (Up to 40km)

Overview

The 155M Bi-Directional (BiDi) SFP Fiber Transceiver (SFP-FE-BX20) is designed to modernize and extend Fast Ethernet networks. Operating at a speed of 155 Mbps, this module is the perfect solution for legacy telecom systems, industrial automation controls, and utility networks that require reliable long-distance connectivity up to 20 kilometers.

Using Wavelength Division Multiplexing (WDM) technology, the SFP-FE-BX20 transmits and receives data over a single strand of Single Mode Fiber (SMF), typically utilizing the 1310nm and 1550nm wavelengths. This single-fiber efficiency dramatically reduces cabling costs and simplifies fiber management in crowded conduits.

Key Features

• Data Rate: 155 Mbps (Fast Ethernet / SONET OC-3 / SDH STM-1).
• Distance: Up to 20km on 9/125µm Single Mode Fiber.
• Simplex Operation: Bi-Directional communication via a single Simplex LC connector.
• Wavelengths: Tx 1310nm / Rx 1550nm (Side A) and Tx 1550nm / Rx 1310nm (Side B).
• DDM/DOM Support: Digital Diagnostic Monitoring for real-time link health analysis.
• Durability: Industrial-grade components suitable for harsh environments.

Applications

While Gigabit speeds are common in offices, the 155M BiDi SFP remains a critical component in specific sectors:

• Industrial Automation: Connecting PLCs and SCADA systems over long distances where 100Mbps is sufficient.
• Utility Networks: Smart grid substations and railway signaling networks.
• Telecom Backhaul: Legacy SONET/SDH equipment maintenance and last-mile FTTx connections.
• IP Surveillance: Extending Fast Ethernet links for remote security cameras.

Specifications

Compatibility

This transceiver complies with the SFP Multi-Source Agreement (MSA), ensuring it works with a wide range of Fast Ethernet switches, routers, and media converters from manufacturers including:

• Cisco (FE Ports)
• MikroTik (SFP ports compatible with 100M)
• Moxa & Hirschmann (Industrial Ethernet Switches)
• TP-Link & D-Link (Switches with 100M SFP slots)
• Huawei & ZTE (OLT/ONU equipment)

Advantages of BiDi Technology

Migrating to Bi-Directional transceivers effectively doubles the capacity of your existing fiber infrastructure. If you have a limited number of fiber strands available between two buildings or sites, replacing dual-fiber modules with BiDi modules frees up fibers for redundancy or additional services.

FAQ

1. Can this module work in a Gigabit SFP port?

It depends on the switch. Some Gigabit SFP ports are dual-speed and can negotiate down to 100Mbps/155Mbps. However, many modern enterprise switches are “Gigabit only” and will not recognize a 155M module. Please check your switch datasheet for “100/1000” or “Multirate” support.

2. Do I need SFP-FE-BX20-U and SFP-FE-BX20-D?

Yes. BiDi technology requires matched pairs. If one side transmits at 1310nm (Side A/U), the other side must receive at 1310nm and transmit at 1550nm (Side B/D). You cannot connect two identical modules (e.g., two “D” units) together.

3. What cable should I use?

You need a standard Single Mode Fiber (OS1 or OS2) patch cable with a Simplex LC connector. Multimode fiber (OM1/OM2/OM3) is not supported and will result in link failure.

4. Is this compatible with SONET OC-3?

Yes, 155 Mbps is the standard rate for SONET OC-3 and SDH STM-1. This module can often be used in SONET/SDH equipment, provided the equipment accepts MSA-compliant SFP modules.

5. What does “FE” stand for in the model name?

“FE” stands for Fast Ethernet (100 Mbps). This distinguishes it from “GE” (Gigabit Ethernet) or “10G” modules, ensuring you select the correct speed for your equipment.