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WipLL System Description
2-12 of 2-12 Marconi Communications Ltd. MCIL -WIPLL-SDN_R2_00
PSTN has traditionally been a low delay network and has not bothered with echo
cancellation, at least in smaller countries, if the round trip delay is below 50ms.
Echo cancellors are used in international calls between different PSTNs.
The key principle is that the network that causes the echo should cancel it. Applying
this principle to the introduction of IP based WLL systems means that echo should
system echo cancellation has been implemented in both the SDTA (upto 8ms) and
the head-end gateways (upto 64ms).