RoadRunner
U S E R S G U I D E
63
present at the output. Do not attempt to change the encoder/decoder
bit rate while the
RoadRunner
is in loopback. The current line format
sets the loopback bit rate. If the
RoadRunner
is configured for one-line
operation, the loopback bit rate is 64 kb/s. The loopback bit rate
defaults to 128 kb/s when in 2-line mode.
Symptom
Possible cause
Solution
No audio in
loopback
—Bad cables
—Output muted
—Input/output levels not
set properly.
—Invalid encoder or
decoder bit rate
1.
Check all cables, disconnect I/O
cables from
RoadRunner
, and
connect together. If no audio,
replace cables.
1.
Check decoder muting
(<Decoder><Audio Out>
<Mute>)
1.
Check level settings
2.
Certain phantom power supplies
and microphone pre-amps
require that the cable shielding be
lifted at one end.
1.
Only 64 or 128 kb/s is allowed in
loopback.
No Audio when Connected to Another Codec
After you are certain that you have established a connection with a far
end codec at the proper bit rate, you should be framed, and have bi-
directional audio. To determine if you are framed to the far end codec,
the ON LINE LED should be illuminated.
If you have connected to another
RoadRunner
, you should both use the
same Quick Configuration to insure setup compatibility. If connected
to a
CDQ
Prima
or
Prima
LT
, you should insure that an appropriate
configuration is used. When connecting to a codec not manufactured
by MUSICAM USA or CCS Audio Products, you must us a decoder
independent configuration.
Hint: