User's Guide Part 1

Chapter 1: Product description Wireless operation
Link mode optimization
Link mode optimization allows the PTP 700 link to be optimized according to the type of traffic
that will be bridged. The link supports two modes, IP Traffic and TDM Traffic.
IP traffic
IP Traffic mode is optimized to provide the maximum possible link capacity. IP Traffic mode is
an appropriate choice where applications in the bridged networks provide some measure of
reliable transmission, and where very low latency is not critical. IP mode supports both fixed
and adaptive link symmetry.
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 Traffic mode is selected automatically when TDM interfaces
are enabled.
Further reading
For information about…
Refer to…
Effect of IP and TDM modes on link symmetry Link symmetry on page 1-8
Effect of IP and TDM modes on link data
throughput capacity
Calculating data rate capacity on page 3-27
Data throughput capacity tables on page 3-71
Effect of IP and TDM modes on system
threshold, output power and link loss
System threshold, output power and link loss
on page 3-60
How to configure link mode optimization Wireless Configuration page on page 6-21
Link mode optimization alarms Alarms on page 7-17
Link symmetry
The PTP 700 series provides eight configuration options for apportioning the available capacity
between the two link directions.
•
Symmetric –
The Master and Slave have equal capacity. The PTP 700 series achieves this
by allocating an equal Burst Duration for the Master and the Slave.
•
5:1
–
The capacity in the direction Master to Slave is five times that of the direction Slave to
Master. The PTP 700 series achieves this by setting the Burst Duration of the Master to five
times that of the Slave
•
3:1
–
The capacity in the direction Master to Slave is three times that of the direction Slave
to Master. The PTP 700 series achieves this by setting the Burst Duration of the Master to
three times that of the Slave.
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