Specifications

RoadRunner USERS GUIDE

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 CDQPrima 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: