100BaseTx to 100BaseFx media converter




  • Round trip delay of only 40 bit times - far below the Class II rating of 92 bit times
  • Auto-Negotiation
  • Auto-MDI/MDIX
  • Active Link Pass Through
  • Far-End-Fault (FEF)
  • Power Supply Included


The E-100BTX-FX-05 is a stand-alone media converter that provides an interface between 100Base-TX ports and 100Base-FX ports, allowing users to integrate fibre optic cabling into 100Base-TX copper environments. Operating at Layer 1, the physical layer, data is passed through the converter at line speed, making it ideal for applications where low latency is essential.

Link Loss


Link Pass-Through
The Link Pass-Through feature allows the media converter to monitor both the fiber and copper RX (receive) ports for loss of signal. In the event of a loss of an RX signal (1), the media converter will automatically disable the TX (transmit) signal (2), thus, “passing through” the link loss (3). The far-end device is automatically notified of the link loss (4), which prevents the loss of valuable data unknowingly transmitted over an invalid link.


Far end fault

Far-End Fault
When a fault occurs on an incoming fiber link (1), the media converter transmits a Far-End Fault signal on the outgoing fiber link (2). In addition, the Far-End Fault signal also activates the Link Pass-Through, which in turn disables the link on the copper portion of the network (3) and (4).


Item Description

IEEE 802.3


SW1: Auto-Negotiation On/Off; SW2: Pause TX On/Off;

SW3: LPT On/Off; SW4: FEF On/Off


Jumper Block 1: Auto-MDI/MDIX enable

Status LEDs

PWR (Power): Lit for normal operation
SDF (Signal Detect Fibre):
SDC (Signal Detect Copper):
RXF (Receive Fibre):
RXC (Receive Copper):


Width: 3" [76 mm]
Depth: 4.7” [119 mm]
Height: 1" [25 mm]

Power Supply

External AC/DC required; Output: 9 VDC. 1.0A;
120-240VAC input, unregulated; standard


Operating: -25°C to 65°C
Humidity: 5% to 95% (non-condensing)
Altitude: 0 – 10,000 ft.


Safety: Wall Mount Power Supply:
UL Listed, cUL Listed (Canada)
FCC Class A, CISPR22/EN55022
Class A, EN55024, EN61000, CE Mark



Ordering Information

Order Code Description
TN-E-100BTX-FX-05(HT) 100Base-TX to 100Base-FX 1300nm multimode (ST)
TN-E-100BTX-FX-05(SCHT) 100Base-TX to100Base-FX 1300nm multimode (SC)
TN-E-100BTX-FX-05(SMHT) 100Base-TX to 100Base-FX 1310nm single mode (SC)

More Information