1
Introduction to the Sylantro Communications System
1-4 Sylantro 4-Port Adapter Installation Guide
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Jitter buffers
The network can inflict a packet-by-packet time delay, which may be different
for each packet. Jitter buffers deliberately delay incoming IP packets in order to
create a fixed spacing, and also fix any out-of-order errors of the packets by
looking at the sequence number in the RTP frames and reassembling the voice
stream in the correct order.
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Echo cancellation
Echo is the reflection back to the sender of a telephone call. This echo is
eliminated by signal processors called echo cancellers. They sample the
transmission and echo signal and insert an out-of-phase cancellation signal into
the return channel, thus eliminating echo.
The adapter interfaces customer analog or digital telephones with the IP network
supplied by the service provider, as shown in Figure 1-1.
Figure 1-1
Sylantro 4-port Adapter Architecture
4port_client_adap
DSL modem
Modem
FAX
or
Digital
Adapter
Analog
Adapter
Ethernet
switch
Customer
Service provider
LAN
Analog phones
Summary of Contents for 4-Port Adapter
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