Comrex BRIC-Link II, Product Manual

Page: 33 / 104

LOCAL & REMOTE SETTINGS
When choosing an IP-based channel (i.e., BRIC Normal), users will be presented with two categories of op ons:
Local and Remote. The
Local Se ngs are used to determine how the local BRIC-Link II behaves (the one that
“makes the call”), and the Remote Se ngs will determine how the remote Comrex codec behaves (the one that
“receives the call”). Each category lists the following op ons:
Connec on Timeout - Under normal circumstances, a connec on will be terminated on one end, and the other
end will drop the connec on in turn. However, if a network failure occurs or a connec on is ended abruptly (e.g.
because the power to one unit was unexpectedly killed), the system will drop the connec on a er a predetermined
me. The default is 60 seconds, but this can be shortened or lengthened as desired. If an inde fi nite connec on is
necessary, refer to Opera ng BRIC-Link II in a 24/7 Environment on page 69 for addi onal informa on.
Encoder - Using this menu, users can select the encoder (or “algorithm”) used to send audio from this BRIC-Link II
(under Local Se ngs ) as well as the encoder used to send audio to this BRIC-Link II (under Remote Se ngs ). The
default value of the remote encoder is to follow the local encoder (i.e., it will send audio using exactly the same
encoder mode it receives). This is de
fi ned as “Follow Mode” in the remote encoder selec on table. See the About
the Algorithms sec on on page 78 for more informa on on selec ng encoders. It is unnecessary to de fi ne any
decoder types when using Comrex codecs because they automa cally adapt to the incoming stream.
Transmit On/O ff - This op on determines whether the selected encoder (local or remote) is actually sending
any data. By default, Transmission on all encoders is turned on, but there may be circumstances where one-way
opera on is desired (e.g.
Mul streaming , as described on page 81 ). Turning o ff the local encoder transmission
disables outgoing audio and disabling the remote encoder transmission disables incoming audio.
ADVANCED LOCAL & REMOTE OPTIONS
The following advanced op ons apply to both the local and remote entries and largely deal with the performance
of Ji er Bu ff er Manager . This is actually a very complex decision-making process involving many variables, and
most of the me the default parameters should work well. These advanced op ons are a means of overriding these
defaults, and Comrex recommends that users take care when changing them. Note that when it comes to se ngs
that e
ff ect the ji er bu ff er manager, local se ngs a ff ect the decoder on the local side, and remote se ngs a ff ect
the decoder on the remote end.
Frames per Packet - This func on allows the encoder to wait for variable “ X ” number of frames to exist before
sending a packet. This op on di ff ers from FEC (Forward Error Correc on) because each frame is only sent once.
Se ng 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 o en.
Decoder Downmix - This op on controls the method by which decoded stereo audio will be down-mixed to mono.
Mono output can be created using only audio from the Le or Right stereo channel, or by combining both channels.
Loss Cushion - Packets may arrive at the decoder displaying a range of sta s cal proper es. They may arrive in
reasonably good ming and in order, or half may arrive quickly with the other half delayed signi fi cantly. In some