Prodys S.L. Tel: +34 91 6896880
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Fax: +34 91 6943777
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Email:
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Web:
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Page 127
V.6.18
PRODYS IPv4 addresses
Prodys factory default settings for the IP parameters are:
-IPv4 address: 192.168.100.100
-Netmask: 255.255.255.0
For further information about multicast, please, read the IP Addressing
Overview.ppt file, available in the Prodys site download section.
The user can restore these default settings by pulling down DIP switch
number 7 and power cycling the unit. After that, the user can establish
different values for these parameters either from the front panel or from
the web page. Do not forget to pull the DIP switch up in order to maintain
these settings.
V.6.19
Forward Error Correction (FEC)
33
Streaming audio over Wide Area Networks, like Internet, means living with a
small chance that some bits audio information are lost along their way to the far-
end codec. Those drop-outs would be perceptible without any counter-measure.
Prodys IP Family enables, if required, the
Forward Error Correction (FEC)
protocol as per the RFC 2733 standard. Essentially this protocol streams
redundant audio information over the network. The decoder, at the far-end,
recovers the audio information either from the main or the redundant IP stream.
The chance to loose audio information is now negligible.
Transmission of redundant information pays a penalty due higher IP bandwidth
requirement. Prodys provides a
<50% FEC>
, which means a 50% of bandwidth
overhead, and it is able to recover from isolated lost packets. Also a
<100%
FEC>
is possible, which doubles the bandwidth requirements. This method
clearly requires additional delay at the sender. However, it allows some bursts of
two consecutive packet losses to be recovered. The
<FEC Port>
defines the UDP
Destination Port for the redundant audio information.
Following examples are given:
33
FEC is only available on SIP protocol.
Содержание IP Family
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