Motorola PTP 500 User's Guide Page 59

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PTP 300 and PTP 500 Series User Guide Wireless operation
phn-1115_006v000
Sep 2010
1-19
Wireless operation
Time division duplexing
TDD cycle
PTP 300 and PTP 500 series links operate using Time Division Duplexing (TDD). They
use a TDD cycle in which the ODUs alternately transmit and receive TDD bursts. The
TDD cycle is illustrated in Figure 1-16. The steps in t
he cycle are as follows:
1. The TDD master transmits a burst to the TDD slave.
2. A delay occurs as the master-slave burst propagates over the link.
3. The slave receives the burst from the master.
4. The slave transmits a burst to the master.
5. A delay occurs as the slave-master burst propagates over the link.
6. The master receives the burst from the slave.
7. The master transmits the next burst to the slave.
TDD frame parameters
The TDD burst duration varies depending on the following:
Channel bandwidth
Link range
Link optimization mode
Link symmetry
Offered traffic loading.
The TDD frame duration varies depending on the following:
TDD burst duration master-slave.
TDD burst duration slave-master.
Link range.
The propagation delay in Step 2 is necessarily equal to the propagation delay in Step
5, and is determined solely by the link range. There will be added delays between rx
and tx on the master and slave to minimise interference.
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