Wireless Operation; Time Division Duplexing - Motorola PTP 600 series User Manual

User Guide: PTP 600 Series

Wireless operation

Time division duplexing

TDD cycle
PTP 600 series links operate using Time Division Duplexing (TDD). PTP 600 uses a
TDD cycle in which the ODUs alternately transmit and receive TDD bursts. The TDD
cycle is illustrated in
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. A delay occurs as the slave processes the master-slave burst.
5. The slave transmits a burst to the master.
6. A delay occurs as the slave-master burst propagates over the link.
7. The master receives the burst from the slave.
8. 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
6, and is determined solely by the link range. The delay at Step 4 is fixed, except
where the link is operated with TDD synchronisation.
phn-0896_012v000
Jul 2010
4Gon www.4Gon.co.uk info@4gon.co.uk Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299
Figure 1-19. The steps in the cycle are as follows:
Wireless operation
1-23