User Guide: PTP 600 Series
Wireless operation
phn-0896_009v003
Feb 2010
UNDER DEVELOPMENT
1-21
TDM traffic
TDM Traffic mode is optimized to provide the lowest possible latency. TDM Traffic
mode additionally implements a more conservative approach to adaptive modulation,
leading to lower error rates in fading channels at the expense of slightly lower link
capacity. TDM Traffic mode is an appropriate choice for delay intolerant data without
reliable transmission (for example voice over IP data). TDM mode is selected
automatically when Telecom interfaces are enabled.
Link symmetry
The PTP 600 series provides four configuration options for apportioning the available
capacity between the two link directions.
•
Symmetric:
The Master and Slave have equal capacity. The PTP 600 series
achieves this by allocating an equal Burst Duration for the Master and the Slave.
•
2:1
The capacity in the direction Master to Slave is twice that of the direction
Slave to Master. The PTP 600 series achieves this by setting the Burst Duration
of the Master to twice that of the Slave. Note that this mode is not available
when TDD synchronization is enabled (see section
TDD Synchronization)
•
1:2
The capacity in the direction Slave to Master is twice that of the direction
Master to Slave. The PTP 600 series achieves this by setting the Burst Duration
of the Slave to twice that of the Master.
NOTE
This mode is not available when TDD synchronization is enabled (see
division duplex synchronization
on page
•
Adaptive:
The capacity allocated to a given link direction is dependant on the
offered level of network traffic in both link directions. If the level of offered
traffic in both directions is equally high or equally low, the PTP 600 will allocate
equal capacity to both directions. If however the offered level of traffic is greater
in one direction, it is allocated a greater proportion of the overall link capacity.
The PTP 600 series achieves this by increasing (or decreasing) the duration of
the Transmit Burst in a given link direction as the offered level of network traffic
increases (or decreases) in this same direction. This is done independently for
the two directions.
NOTE
This mode is not available in the following configurations :
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