05.563GPPCTS-Fixed Part (FP) radio subsystemGSM Cordless Telephony System (CTS), Phase 1TS
The CTS-FP shall fulfil all the requirements in the full temperature range of:
+15C ‑ +35C for normal conditions (with relative humidity of 25 % to 75 %);
+10C ‑ +40C for extreme conditions;
Outside this temperature range the CTS-FP, if powered on, shall not make ineffective use of the radio frequency spectrum. In no case shall the CTS-FP exceed the output power levels as defined in GSM 05.56 for extreme operation.