MIL-STD-1553 Fibre Optic Bus Extender

The AE-1553-FOE is designed to extend the range of a MIL-STD-1553 Data Bus beyond that which can be reliably sent over copper.

  • Compliant to MIL-STD-1553A & B, MIL-STD-1760, ARINC 708A
  • Two way MIL-STD-1553 communication over 5 µm/125 µm multimode fibre
  • MIL-STD-1553 data bus extension upto 908m (subject to operational constraints)
  • Autonomous Operation
  • Class 1 FDA IEC60825-1 laser safety compliant

The AE-1553-FOE, MIL-STD-1553 Fibre Optic Bus Extender, provides system designers the ability to extend MIL-STD-1553 signal transmissions to Remote Terminals, separated from the main data bus by distances of several hundred meters, using a (62.5 µm/125 µm) Multi-mode Optical Fibre cables, subject to the response time of the remote terminals and optical transmission delays.

The AE-1553-FOE is designed to extend the range of a MIL-STD-1553 Data Bus beyond that which can be reliably sent over copper and this is achieved by converting MIL-STD-1553 signal transitions directly to symbols which are retransmitted over a fibre optic cable where it is captured by a second AE-1553-FOE device and then re-transmitted on to a second MIL-STD-1553 Data Bus for reception by a Remote Terminals.

The AE-1553-FOE requires 0.38 µs to convert MIL-STD-1553 signals to Fibre Optic and a further 0.17 µs to convert Fibre Optic signals back into MIL-STD-1553.

The range for which this data bus extension is possible, is further limited due to the finite speed (4.9 µs / km) at which signals can be transmitted over the optical link and the response time of the Remote Terminal. A pictorial representation of this process is shown in figure 1. Furthermore, the MIL-STD-1553 specification requires that a Remote Terminal (RT) must respond to a Bus Controller (BC) command within a time period of 4 to 12 µs although a BC must wait at least 14 µs before implimenting a no-response time-out and this does have a consequential influence on the practical range of the bus extender. That is, the practical range is not so much constrained by the overall Optical Fibre transmission range, but by operational constraints due to the finite propagation speed through the cables and the need to meet the strict requirements of MIL-STD-1553 specification.


The AE-1553-FOE has a total propagation delay of 0.38 + 0.17 µs = 0.55 µs and the Optical Fibre cable has a transmission delay of 4.9 µs / km.  MIL-STD-1553 Remote Terminal (RT) must respond to a valid command within the time period of 4.0 to 12.0 µs. However, the specification also states that the BC must not impliment a time-out less than 14 µs.

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