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Chapter 1: Product description
Wireless operation
Page 1-13
IP link optimization in the PTP topology
The IP link optimization mode provides the maximum possible link capacity. IP 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 link optimization in the PTP topology
The TDM link optimization mode provides the lowest possible latency. TDM 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 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.
Link optimization in the HCMP topology
The HCMP topology supports only IP link optimization.
Further reading
For information about…
Refer to…
Effect of IP and TDM modes on link symmetry
Effect of IP and TDM modes on link data
throughput capacity
Calculating data rate capacity
Data throughput capacity tables
Effect of IP and TDM modes on system
threshold, output power and link loss
System threshold, output power and link loss
How to configure link mode optimization
on page
Link mode optimization alarms
Link symmetry
PTP topology
The PTP 670 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 670 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 670 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 670 series achieves this by setting the Burst Duration of the Master to
three times that of the Slave.