Comrex ACCESS 2USB, Руководство по эксплуатации продукта

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ADVANCED TOPICS
Q: CAN I gET A rEmOTE INDICATION ThAT ACCESS IS CONNECTED TO SOmEONE?
A: Yes. Using the Configure Tab/Additional Configuration , you can re-assign Contact Closure Output #4 to trigger
whenever the ACCESS makes a valid connection. The function of Contact Closure #4 will be changed in the
following ways:
a Contact Closure #4 will no longer be available as an end-to-end signal.
b Whenever ACCESS detects a valid incoming stream, it will trigger
CC #4
and maintain it
until all valid connections stop.
Q: WhAT STEPS ShOulD I TAkE WhEN I’m hAVINg CONNECTION PrOblEmS WITh ACCESS?
A: The first step is to determine whether the problem is occurring in one direction or both. If in only one direction,
take a look at network usage patterns on the local end of each ACCESS. If someone else on your LAN is downloading
large files on the decoder side (or uploading large files on the encoder side) this may cause some performance
issues. You may need to ask them to temporarily cease activity, or investigate a network router solution that will
offer ACCESS priority over other traffic.
Next, take a look at the Stats tab on the ACCESS that is decoding the faulty audio. Check the jitter figure for your
incoming connection. If this number is varying dramatically (good networks keep this figure below 50mS) then you
may need to increase the Local Delay Cushion setting within the profile used to connect to that remote. Although it
will increase your audio time delay, you may find increasing the cushion by 100-300mS or more will result in more
stable connections, since the jitter buffer manager will no longer attempt to reduce delay by making the buffer
smaller than the cushion.
Q: hOW CAN I OPTImIzE SETTINgS fOr EVDO, umTS, Or OThEr WIrElESS ACCESS?
A: Since there is typically already a substantial delay in these networks, it’s often not a priority to keep ACCESS delay
to the absolute minimum. Using the profile that you set up for the EVDO connection, enter the
Advanced Options .
Raise the Frames/Packet setting to 4 in both Local and Remote Encoders . This will reduce overall bandwidth and
enhance reliability on many networks. You may also need to increase Delay Cushion on the non-wireless decode
side as described in the previous answer.