USER’S MANUAL
Section 11: THE WORKS – Detailed Menu Reference 209
c
COMPATIBILITY TIP!
When two channels are required for transmission (i.e. for Stereo, J-Stereo, and Mono 128) an
"inverse multiplex" (IMUX) scheme must be used to break the standard MPEG data stream
into two streams for transmission.
In Layer-2, the Zephyr Xstream uses the CCS CDQ (TM) IMUX protocol. Most Layer-2
codecs support this method, allowing for compatibility among different codec manufacturers.
The Telos IMUX used in AAC and AAC-LD is published on our web site to support
interoperability with other manufacturers implementing AAC and AAC-LD
L2
Mono
64
This
encodes
a
single
mono
bitstream
using
the
audio
from
the
A
input
using
the
MPEG
Layer
‐
2
algorithm.
Both
32
and
48
kHz
sample
rates
are
supported.
This
bit
stream
is
fed
to
both
ISDN
B
channels
so
it
can
be
used
to
feed
identical
mono
to
two
sites.
Offers
7.8
kHz
audio
frequency
response
if
the
transmission
channel
is
56
kbps.
It
offers
9.8
kHz
frequency
response
when
the
transmission
channel
is
64
kbps.
L2
Half
64
This
is
the
only
mode
in
the
Zephyr
Xstream
that
supports
24
kHz
for
the
sample
rate.
It
is
a
mono
mode.
Other
than
the
fact
the
24
kHz
sample
rate
is
internally
(and
invisibly)
used,
its
operation
is
the
same
as
the
other
Mono
64
modes.
Offers
8.6
kHz
audio
frequency
response.
Receive:
Note
that
the
easiest
choice
is
to
use
the
Auto
selection.
However,
it
can
take
longer
to
lock
and
achieve
output
audio,
than
if
the
correct
Receive
mode
is
set.
The
appropriate
Receive
mode
will
be
determined
by
the
encoding
or
Transmit
mode
used
at
the
far
end.
Section
10
(Applications
Guide)
includes
charts
detailing
the
correct
Receive
mode
to
use
with
the
different
Transmit
modes
for
various
codecs.
Until
the
Auto
system
has
determined
the
correct
receive
mode
to
use,
it
will
display
(Search)
for
Receive
mode
on
the
default
status
and
CODEC
status
screen.
Once
the
correct
Receive
has
been
determined,
that
information
will
be
displayed.
w
IMPORTANT!
The settings of the Sample Rate and Bit Rate (see below) are important as well as the
Transmit and Receive settings. Note that these must be matched between the two units
before the AUTO Receive mode will be able to function.
Note that if a transmission mode requiring two channels is used, and only one channel is
dialed, the AUTO setting will not be able to find a match.
The bit rate will normally be changed automatically on incoming calls as this information is
conveyed by the ISDN network.
Summary of Contents for Zephyr Xstream
Page 2: ......
Page 26: ...USER S MANUAL Section 1 QUICK RESULTS 14...
Page 30: ...USER S MANUAL Section 2 INTRODUCTION Getting to Know the Zephyr Xstream 18...
Page 70: ...USER S MANUAL Section 3 GUIDED TOUR of the HARDWARE 58...
Page 144: ...USER S MANUAL Section 6 AUDIO CODING REFERENCE 132...
Page 164: ...USER S MANUAL Section 8 LIVEWIRETM IP Audio 152...
Page 310: ...USER S MANUAL Appendix 1 Codec Interoperability Information 298...
Page 320: ...USER S MANUAL Appendix 3 ISDN Cause Phrases Values 308...
Page 324: ...USER S MANUAL Appendix 4 Known Working SPID Formats by Telco 312...
Page 356: ...USER S MANUAL Appendix 9 Modular Cable Guide 344...
