For FDD systems used for the uplink in a duplex system, for example a GSM system, the frequency bands provided are not the same as those for the downlink and, for TDD systems, such as the DECT system, {HEAD ~ different time periods} are provided for the uplink and {TAIL ~ downlink} 
For FDD systems used for the uplink in a duplex system , for example a GSM system , the frequency bands provided are not the same as those for the downlink and , for TDD systems , such as the DECT system , { HEAD ~ different time periods } are provided for the uplink and { TAIL ~ downlink }
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