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Stand-alone Ethernet Transceiver
10Base-5 AUI to 10Base-T RJ-45

The E-TBT-MC05 is an Attachment Unit Interface (AUI) transceiver that provides a method for connecting a workstation, or any other device with an AUI port, to twisted pair cabling in a 10Base-T network. Devices with AUI ports could include: servers, hubs, bridges and routers. The E-TBT-MC05 transceiver allows twisted pair, UTP or STP, to be connected to these AUI ports.

E-TBT-MC05 Overview


  • Provides a complete interface of the AUI to Ethernet UTP cable
  • Supports data transfer rate of 10 Mbps
  • CSMA/CD access mechanism
  • Capable of driving the UTP cable segment up to 100 m (328 ft.) without the use of a repeater
  • Selectable Link test and SQE test functions
  • AUI locking post design allows the E-TBT-MC05 to directly attach to a host’s AUI connector
  • Can be used with or without an AUI cable
  • LED indicators for network monitoring and diagnosing
  • The RJ-45 port will automatically detect and reverse the polarity on the receive pair, if needed

E-TBT-MC05 Tech Specs


  • IEEE 802.3
  • 10Base-T

Data Rate

  • 10 Mbps


  • SW1: SQE Test: UP is enabled
  • SW2: Link Test: UP is enabled
  • SW3: Half or Full-Duplex: UP is for Half, Down is for Full

Status LEDs

  • COL: Blinks when detecting collisions
  • STAT: Solid Green: UTP Link established; Blinks Green: No UTP Link; 4-Blink Pattern: Polarity reversal detected on UTP cable
  • TX: Blinks when transmitting data on the RJ-45
  • RX: Blinks when receiving data on the RJ-45


  • Width: 3.1” [79 mm]
  • Depth: 0.8” [20 mm]
  • Height: 1.7” [43 mm]

Power Consumption

Power Supply

  • No external power required

Power Input


  • Operating: 0°C to 50°C
  • Humidity: 5% to 95% (non-condensing)
  • Altitude: 0 – 10,000 ft.


  • 1 lb. [0.45 kg]


  • 125,126 hours (Bellcore)


  • FCC & CISPR Class A, CE Mark


  • Lifetime

E-TBT-MC05 Downloads

Additional Product Information

Note: Some Documentation may have Transition Networks named or pictured. Transition Networks was acquired by Lantronix in August 2021. Learn more about the acquisition here.

Lantronix Part # Name Description Order Now
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Lantronix Part #

10Base-5 (AUI) dB-15 male [50 m/164 ft.] to 10Base-T (RJ-45) [100 m/328 ft.

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