Telos Zephyr Xstream User Manual page 222

It will be helpful to understand the following terminology when determining what Receive mode
should be used:
64 ‐ This is a Zephyr Xstream Transmit mode that requires only a single B channel to operate.
The actual bit rate of that channel could be either 56 or 64 kbps. The correct Receive mode will
also have "64" in it (for example "L2 64").
128 ‐ This is a mono Transmit mode that requires two B channels (i.e. calls) to operate. The
actual bit rate of those channels could be either 56 kbps (for a total of 112 kbps) or 64 kbps (for
a total of 128 kbps). The correct Receive mode for a Transmit mode with "128" in the name will
just have the name of the algorithm (for example "L2").
Dual/Mono ‐ This is simply a special case of Mono 64. In the Dual Mono case the A audio Input
source is sent over "Line 1" while the B audio Input source is sent over "Line 2".
J‐Stereo ‐ This is "Joint Stereo" and is the preferred stereo mode in most cases. The biggest
exception is when stereo material will later be transmitted over a surround sound transmission
system (i.e. for Video or Film production) in which case the Stereo mode should be used. All
stereo modes require 2 B channels (2 calls) unless otherwise stated. The correct Receive mode
for a Transmit mode with "J‐Stereo" in the name will just have the name of the algorithm (for
example "L2").
Stereo ‐ This is "Discrete Stereo". The major use for this is when stereo material will later be
transmitted over a surround sound transmission system (i.e. for Video or Film production) in. All
stereo modes require 2 B channels (2 calls) unless otherwise stated. The correct Receive mode
for a Transmit mode with "Stereo" in the name will just have the name of the algorithm (for
example "L2") unless otherwise stated.
J‐Stereo 64 ‐ This mode, unique to AAC, is the only stereo transmission mode that does not
require 2 B channels.
Half 64 ‐ This is a special Layer‐2 mode that operates at 24 kHz sample rate. The audio will be
transmitted at 24 kHz sample rate regardless of the actual sample rate selected in the CODEC
menu.
The Xstream's Receive modes are:
L3
Receives all Layer‐3 modes except for the L3 Dual/Mono mode (and L3 mono
streams at 56 or 64 kbps from other codecs).
L3 Dual/Mono
Can receive 1 or 2 L3 Mono streams at 56 or 64 kbps from other codecs. The
audio bit stream connected to "Line 1" will be output on audio channel A, while
the stream received on "Line 2" will be output on audio channel B.
L2
Receives all Layer‐2 modes except for L2 mono 64.
USER'S MANUAL
Section 11: THE WORKS – Detailed Menu Reference 210