This paper reports on the performance of a 1 mm diameter Step-Index POF-LAN designed for low cost and high volume applications. A 10 Mbit/s Ethernet test system consisting of an active star coupler and transceivers supports link lengths of 100 m and link budgets up to 27 dB with 650 nm light-emitting diodes. All components of the system are commercially available. To test the efficiency in a realistic environment the system has been incorporated in the campus-wide LAN of the University of Ulm. Long-term investigations show reliable data transmission to a BER less than 10-9.
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