Transmitter/Receiver Module (SE)

The transmitter/receiver module is a module that can convert electrical signals into optical signals and transmit them via optical fibers. Every satellite has an electrical-optical transmitter/receiver module.

Fig 1: Identifying Intelligent Star Coupler

Courtesy of BMW OF NORTH AMERICA, INC.

The transmitter/receiver modules are connected individually via the byteflight to the Intelligent Star Coupler in the SIM. The SIM also contains a transmitter/receiver module for each satellite.

Fig 2: Identifying Transmitter/Receiver Modules (SE)

Courtesy of BMW OF NORTH AMERICA, INC.

All information transmitted across the byteflight is in the form of data telegrams sent by means of light pulses. The transmitter/ receiver modules in the SIM receive the light pulses from the various satellites. The Intelligent Star Coupler sends the data telegrams to all satellites. Data transmission is possible in both directions.

Fig 3: Intelligent Byteflight Transmissions

Courtesy of BMW OF NORTH AMERICA, INC.

The transmitter/receiver (SE) module contains the LED for the driver circuit and the receiver amplifier for converting the optical signals into digital signals. It also has an integral transmission quality monitoring circuit.

If one of the following faults occurs on one of the fiber-optic cables, the satellite concerned is shut down: 

• No optical signal received over a pre-defined period.
• Transmitter diode sends a continuous light signal.
• Attenuation on the fiber-optic cable too great.

The permissible degree of attenuation is stored within the system. If the attenuation exceeds the specified maximum level, one of the following faults may be the cause:

• Kinking in the fiber-optic cable.
• Compression of the fiber-optic cable.
• Stretching of the fiber-optic cable.
• Broken fiber-optic cable.
• Damaged fiber-optic cable.