Allied Telesis AT-MX20T-04 Electronic Transceiver

Allied Telesis AT-MX20T-04 CentreCOM micro transceiver is a 10 Mbps Ethernet transceiver (10BASE-T) designed to connect a DTE device to legacy Ethernet media via a twisted‑pair RJ-45 interface and an attached AUI tail for MAU compatibility. This 12 V DC powered module draws a typical current of about 300 mA and up to 500 mA, and it arrives in a compact form factor measuring roughly 6.4 cm by 4.6 cm by 2.0 cm (2.5" × 1.8" × 0.8"). It includes LED indicators for Link (valid connection) and Transmit (data on the line) to help monitor network activity. As part of Allied Telesis’ CentreCOM family, the MX20T-04 is intended for micro transceiver configurations on older 10BASE-T networks, enabling interoperability between modern RJ-45 interfaces and older AUI-based media through the MAU interface. The -04 variant sits within the MX20T line alongside similar models (for example MX20T-05) that share the same basic form factor and function but may differ in minor electrical characteristics or timing tolerances. In typical usage, it is mounted between a DTE device and the Ethernet media, supporting the 10 Mbps data rate that defined early Ethernet segments and compatible hubs, while providing the practical flexibility of both RJ-45 and AUI connectivity.