ACCESS Product Manual
45
In addition to TCP, there are several other advanced channel modes:
HTTP –
ACCESS has the ability to act as a streaming server, delivering AAC
and HE-AAC to compatible PC based media players. Normally in this mode,
connections are requested on an incoming basis so no outgoing profile
setup is required. But ACCESS also has the ability to initiate a stream to a
Shoutcast-compatible server in order to distribute the stream to users. Only
in this instance should a profile be set for HTTP.
Multicast
– Should only be used to initiate IP Multicast connections (not
for use on the Internet). See Section 13 for more on Multicast connections.
Standard RTP
– This setting is used in the unusual scenario where the
network is viable in only one direction. Standard RTP has the ability to
send and receive streams without any status information being relayed
between the codecs.
When designating
Local
and
Remote
options for a normal BRIC or TCP
channel, several new categories will appear. Some of them address the
encoder and some address the decoder.
Most of the
Advanced
Encoder
options alter the relationship between
frames and packets. In this context, a frame is the smallest chunk of
encoded audio that can be extracted from the encoder. For the lowest
possible delay, this frame is wrapped into its own packet and sent into the
network.
The following advanced option affect the Encoder:
Frames per Packet
– Allows the encoder to wait for X number of frames
to exist before sending a packet. This option differs from FEC because each
frame is only sent once. Setting this value to a number higher than one
can reduce network usage, at the expense of delay. This is because packet
overhead bits like IP and UDP headers are sent less often.
Log Statistics
– This function is used in factory diagnostics and should be
left disabled unless instructed by Comrex support.
UDP Reliability Max Retransmissions
– This parameter allows you to set
an upper limit on how much additional bandwidth is utilized by the BRUTE
UDP reliability layer. The default setting is 100, which allows the error
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