Abstract：Research purposes: The optic-fiber repeaters are widely used in the GSM-R network. How to apply it reasonably and make it serve better in the GSM-R network needs further analysis and research.
Research methods: An analysis has been theoretically made of influences of the uplink noise from the optic-fiber repeater on the repeater and time-limited delay ， etc. And some advices have been put forward on application of optic-fiber repeaters in the GSM-R engineering.
Research results: It has been pointed out through analysis that not more than four optic-fiber repeaters shall be set in each BTS. If more than four ， this will reduce the sensitivity of BTS. The BTS and optic-fiber repeater shall be covered by spatial waves while the optic-fiber repeater shall be better to be covered by the single-directional antenna far from the BTS. In the LCX section，the coverage range cannot be increased due to the time-limited delay by increasing the output-electrical level of optic-fiber repeaters. It is better not to cut off the LCX between the BTS and the optic-fiber repeater.
Research conclusions: In the GSM-R engineering ， not only the electrical level would be considered，but also the uplink noise and the time-limited delay would be considered.
2007, Vol. 24 
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