47 CFR §27.1506

The 897.5-900.5 MHz and 936.5-939.5 MHz band segments are available for licensing with an authorized bandwidth up to 3 megahertz paired channels. The 896-901 MHz and 935-940 MHz bands are available for licensing with an authorized bandwidth up to 5 megahertz paired channels. The 897.5-900.5 MHz band segment or 896-901 MHz band segment, as applicable, must only be used for uplink transmissions. The 936.5-939.5 MHz band segment or 935-940 MHz band segment, as applicable, must only be used for downlink transmissions.