Motorola PTP 500 User's Guide Page 70

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Wireless operation Chapter 1 Product description
phn-1115_006v000
1-30
Sep 2010
Synchronized networks
TDD synchronization can be used to relax constraints on the frequency planning of
PTP 500 networks. Synchronization has the following benefits:
Allows tighter frequency re-use, and thus wider channel bandwidth.
Allows more convenient collocation of units on a single mast.
Allows use of smaller or lower performance antennas.
Reduces inference, resulting in use of more efficient modulation modes.
NOTE
TDD synchronization is not supported in the PTP 300 Series.
In a correctly designed synchronised network, all links are configured with the same
TDD frame duration, and the TDD frame contains guard periods longer than the
propagation delay between the most distant interfering units.
Each synchronized unit is assigned to one of two phases. A master ODU can be
assigned to either phase. A slave ODU must be assigned to a different phase from the
associated master ODU. The phase is set by suitable configuration of TDD Frame
Offset.
TDD synchronization eliminates RF interference between units in the same phase. This
means that frequency planning in a synchronized network is concerned only with
interference between units in different phases. Frequency planning is still necessary,
but the number of potential interference paths to be considered is halved. Frequency
planning in a synchronized TDD network has approximately the same level of
complexity as frequency planning in a Frequency Division Duplex (FDD) network.
TDD synchronization
Additional hardware
To synchronize PTP 500 links, one PTP-SYNC unit is required for each master ODU.
The PTP-SYNC unit is connected in line in the drop cable between the PIDU Plus and
the ODU, and is collocated with the PIDU Plus.
NOTE
TDD synchronization is not supported in the PTP 300 Series.
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