10/100 Base TX to 100 Base FX Fiber Optic Media Converter, Multimode ST

Extend 10/100 Ethernet Networks Over Multimode Fiber

The M7273SB provides a simple method of integrating fiber optic cabling into an existing 10/100Mbps copper Ethernet network. The converter accepts a 10Base-T or 100Base-TX connection through its shielded RJ45 port and converts the Ethernet signal to 100Base-FX multimode fiber.

While standard copper Ethernet cabling is limited to approximately 100 meters, the M7273SB supports multimode fiber transmission up to 2 km, allowing Ethernet connections to reach devices, buildings, or network segments located well beyond conventional copper distance limits. The copper interface supports Category 5 UTP cable runs up to 100 meters.

Multimode Fiber Connectivity with ST Connectors

The M7273SB uses dual ST connectors and 1310nm optics for transmission over multimode fiber. It supports both 50/125µm and 62.5/125µm multimode fiber.

According to the model table on page 2 of the datasheet, the M7273SB provides a 2 km transmission distance with transmit power of -14 to -9dBm and receiver sensitivity of -34dBm.

This makes the converter particularly useful when existing ST-terminated multimode fiber infrastructure needs to connect to copper Ethernet equipment.

Automatic Copper Ethernet Configuration

The shielded RJ45 copper interface supports 10Mbps and 100Mbps Ethernet, along with full-duplex and half-duplex operation.

Auto-negotiation allows the converter to determine the appropriate speed and duplex configuration for the connected Ethernet device, while auto-MDI/MDI-X detection simplifies installation by eliminating the need to select crossover or straight-through cabling manually.

The converter also supports forced operating modes when manual configuration is required.

Link Fault Pass-Through and Far End Fault Detection

Fiber links are often used to connect network equipment separated by substantial distances, making fault identification especially important.

The M7273SB incorporates Link Fault Pass-Through and Far End Fault detection to improve network troubleshooting and help identify connectivity problems across the copper-to-fiber link.

The fiber interface also provides detection of the received fiber signal, while front-panel LED indicators display:

• Unit power status
• Copper link/activity
• Copper speed and duplex
• Fiber link/activity
• Fiber signal detection

These indicators provide technicians with immediate visibility into the operating status of both sides of the media conversion link.

Reliable Ethernet-to-Fiber Conversion

The M7273SB uses store-and-forward operation and includes a 1M RAM data buffer and watchdog timer for reliable data handling and operation.

Store-and-forward mode supports Ethernet packets up to 1600 bytes. When operating in smart-forward mode at 100Mbps on both interfaces, the datasheet specifies no packet-size limitation.

These capabilities allow the converter to provide transparent Ethernet-to-fiber connectivity without requiring replacement of the connected Ethernet equipment.

DIP Switch Configuration

The M7273SB provides onboard DIP switches for applications where manual configuration is preferred.

Available settings include:

• Copper operating mode
• Duplex
• Speed
• Link Fault Pass-Through
• Auto Status Report

This gives network installers the flexibility to use automatic configuration for straightforward deployments or manually control selected operating parameters when required.

Standalone, DIN Rail, or Chassis Deployment

The compact M7273SB can be deployed as a standalone media converter or installed in VERSITRON’s MCC-14R 14-slot chassis. Optional DIN rail mounting is also supported.

The chassis configuration is particularly useful when multiple copper-to-fiber connections must be centralized in a telecommunications room, equipment rack, or network distribution location. As shown on page 2 of the datasheet, the optional MCC-14R accommodates up to 14 media converter modules and provides redundant power.

Low-Power Compact Design

The M7273SB operates from +5 to 12VDC, 1A and consumes less than 5 watts of power.

Its compact enclosure measures only 3.70 × 2.79 × 1.02 inches, making it suitable for network locations where equipment space is limited.

The specified operating temperature range is -10°C to +55°C, with a storage temperature range of -40°C to +70°C and 5% to 90% non-condensing humidity.

Typical Applications

The M7273SB is well suited for applications requiring 10/100Mbps Ethernet connectivity to be extended over existing or newly installed multimode fiber.

Typical applications include:

• IP surveillance and security networks
• Building-to-building Ethernet connections
• Access control and intercom networks
• Campus and institutional networks
• Factory and facility networking
• Telecommunications rooms
• Remote Ethernet devices
• Fiber-to-the-desk applications
• Commercial Ethernet networks
• Networks using existing ST multimode fiber infrastructure

Technical Specifications

Specifications are based on the VERSITRON M727xSB datasheet.

VERSITRON Fiber Optic Communications Since 1958

Since 1958, VERSITRON has provided fiber optic communication solutions for commercial, industrial, government, and security applications.

The M7273SB provides a straightforward way to convert 10/100Base-TX copper Ethernet to 100Base-FX multimode fiber, extending network connections up to 2 km while providing fault detection, flexible configuration, and standalone or chassis-based deployment.

For product selection, network integration assistance, or technical support, contact VERSITRON at sales@versitron.com or 1-800-537-2296.

• Full wire speed conversion: Ensures high-throughput and smooth communication between copper and fiber networks.
• Auto-negotiation, auto MDI/MDI-X detection: Automatically detects cable types (MDI/MDI-X) and network speeds (10/100 Mbps), eliminating need for manual configuration.
• Link fault pass through function: Fault is passed to the connected device in case of link failure, helping administrators quickly troubleshoot and identify issues.
• 128Kb RAM data buffer: Ensures reliable data storage and smooth data transmission under heavy loads.
• Watch-Dog timer: Automatically resets the device in the event of a system failure to ensure reliable and continuous operation.
• Far End Fault Function: Helps detect faults on the remote end of the fiber link, improving fault detection and providing real-time status monitoring.
• Stand-alone or chassis installation in MCC-14R: Can be installed in the MCC-14R chassis or as a standalone unit, ensuring flexibility for different deployment configurations.
• Optional DIN rail mounting: Ensures space-efficient and safe mounting in industrial environments.
• USB power port: Offers additional flexibility for powering the device in locations with no standard AC power sources.
• Low power consumption: Consumes little power and reduces overall operational costs, making it ideal for eco-conscious installations. 

10/100 Base TX to 100 Base FX Fiber Optic Media Converter, Multimode ST (M7273SB) Review:

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