Digi International / Milan Technology MIL-240TX 100BASE-TX Port Selector Transceiver

The MIL-240TX is a 100BASE-TX port selector transceiver that eliminates network downtime by providing automatic fault-tolerant redundancy for critical Ethernet devices. When the primary network path fails, the device switches to a backup path in less than one microsecond, ensuring continuous connectivity without manual intervention. Three dedicated ports support the critical device, primary network connection, and backup path. The transceiver intelligently monitors link status and transmits data only on active paths, preventing signal loss and data corruption in industrial and commercial environments.

Technical Specifications

Network Standard: IEEE 802.3u compliant

Transmission Speed: 100BASE-TX

Duplex Modes: Half-duplex and full-duplex transmission supported

Port Configuration: Three RJ45 ports - one for critical device, one for primary path, one for backup path

Switchover Time: Less than one microsecond

Diagnostic Indicators: Four LED status indicators

Power Supply: MIL-5DT (sold separately)

Key Features

Automatic path switchover with sub-microsecond response time

Intelligent link monitoring prevents transmission on inactive paths

Supports both half and full-duplex operation

Industrial-grade construction for harsh environments

Minimal installation complexity with straightforward port assignment

Typical Applications

device connectivity requiring high availability

Industrial control systems with downtime sensitivity

Commercial network infrastructure needing redundant Fast Ethernet links

Systems where automatic failover eliminates manual recovery procedures

Compatibility & Integration The MIL-240TX operates as an IEEE 802.3u–compliant Fast Ethernet device and integrates into existing 100BASE-TX networks without protocol modifications. External power is supplied via the MIL-5DT power supply unit.