For FDD systems used for {HEAD ~ 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 {TAIL ~ TDD systems}, such as the DECT system, different time periods are provided for the uplink and downlink 
For FDD systems used for { HEAD ~ 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 { TAIL ~ TDD systems } , such as the DECT system , different time periods are provided for the uplink and downlink
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH