RoadRunner
U S E R S G U I D E
64
Symptom
Possible cause
Solution
Connection
established, no
audio, not
framed. There
may be relay
chatter
—Bit rate / connection
rate mismatch.
—Incompatible line
formats
—Incompatible connect
rate
—Non MUSICAM USA
codec at far end
—Algorithm mismatch
—Invalid bit rate / sample
rate combination
1.
Check connect rate and
encoder/decoder bit rate.
Encoder/decoder bit rate must be
multiple of connect rate.
1.
Internal TA cannot communicate
using 2 lines to ADTRAN
ISU128 or similar terminal
adapter
1.
Connect data rate not supported
at both locations
2.
Try connecting to our Music
Line (732-706-1437, 56 or
64kb/s, single line).
1.
Decoder must be set to
Independent YES when
connecting to non-MUSICAM
USA codecs.
1.
Check encoder/decoder
algorithms match on both ends
1. Insure combination is supported.
Low sample rate with high bit
rate is not supported
Connection
established,
framed in one
direction, may
have audio in
one direction
—Decoder independent
—Sample rate not valid.
—Bit rate not supported
by service.
—Line format mismatch.
1.
Check that decoder parameters
match the far-end encoder
parameters on both sides of the
connection. If one end is a
CDQ200x, DIP switch 6 on
CDQ200x decoder must be
down. Or you must select a
decoder independent
configuration.
1. CDQ2000 only supports 48 kHz
sampling.
1. With ISDN it is possible that
64K is not supported in both
directions. Try connecting at
another bit rate.
1. Check both ends are using the
same line format.
2. Quick configurations default to