Comrex BRIC-Link II, Product Manual

Page: 35 / 104

CrossLock connec ons, the bu ff er is increased to allow the use of error correc on, so the bu ff er is thus based on a
combina on of the ji er histogram, and the round-trip-delay as calculated by the system. This will generally result
in bigger decode bu
ff ers (and higher delays). Because it is lower, the default se ng is to use the ji er histogram for
all connec ons. This se ng allows the pro fi le user to instead use the CrossLock “error correc on friendly” se ng,
for connec ons where delay is less important.
The following three se ƫ ngs are available to users in BRIC Normal mode. They are legacy se ƫ ngs for use in
non-CrossLock connec Ɵ ons. Most users should leave these se ƫ ngs as-is, as they can interfere with CrossLock
connec Ɵ ons. CrossLock se ƫ ngs now incorporate these func Ɵ ons.
Conges on Avoidance - Enabling this op on allows the encoder to dynamically change the number of frames per
packet sent, thereby reducing total data requirements. In addi on, in most encode modes, enabling conges on
avoidance provides the system a license to step down to a lower encode data rate if desired. This will happen
automa cally and with no audio interrup on. Step down conges on avoidance is not enabled in the Linear PCM
mode.
UDP Reliability - UDP, the Internet protocol used by BRIC Normal connec ons, does not have any inherent error
correc on capability. UDP Reliability adds an intelligent algorithm that requests packet resends when appropriate
above the base UDP level. This UDP Reliability is useful on some wireless connec ons that have unsa sfactory
performance due to packet loss.
Max Retransmission Rate - This parameter places an upper limit on how much addi onal bandwidth is u lized
by the BRUTE UDP reliability layer. The default se ng is 100, which allows the error correc on layer to use the
same amount of bandwidth as the audio stream. For example, if an audio stream is consuming 80 kb/s of network
bandwidth, and UDP Max Retransmissions is set at 50%, up to 40 kb/s addi onal network bandwidth may be used
for error correc on.
SYSTEM SETTINGS TAB
The System Se ngs tab shown in Figure 26 de fi nes system-wide parameters that are not speci fi c to a par cular
remote connec on, such as codec name , contact closures and how to handle incoming connec Ɵ ons . As with the
Pro fi les Tab , basic op ons are shown by default and less frequently used se ngs are hidden un l the Show
Advanced op on is selected.