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Page 84
Prodys IP Family codec operating as “
PSTN CODEC
”
14
: The codec will
be configured to establish communications via any PSTN network.
The Ethernet interface is always available for remote control of the unit, even
if it is configured to operate as an ISDN, PSTN or X21 codec.
You should first select the network type - i.e. the network interface - to be used
for audio data transmission and reception. The menu will only show the
configuration options relevant to the network type selected. Of course, there are
a number of general parameters that will be the same across all network types
and so will not be affected when the network type is changed.
V.2
Configuration parameters that are dependant on the network
type selected
There are two fundamental reasons for which the user must change the Prodys
IP Family codec configuration parameters when a new network interface is
selected:
The available bandwidth over the selected network (IP, ISDN, PSTN or X21).
This places limitations on the bit-rate that can be selected and the amount of
compression. As an example: over ISDN the bit-rates for any algorithm must
fit into 64 or 128Kbps.
The number of available channels: Number of bidirectional communications
which can be achieved. Note that over ISDN and IP, up to two independent
mono communications can be achieved.
The following table shows what the differences between the various
communications networks regarding Prodys IP Family codec operation:
14
PSTN is only available on NomadaIP.
Содержание IP Family
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