Chapter 1: Product description
Wireless operation
Page 1-8
Time division duplexing
TDD cycle
PTP 550 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
. The
steps in the 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 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.
The frame duration must be long enough to allow the master to receive the complete burst in 7
before starting to transmit in 8.