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USER’S MANUAL
Section 4: BASIC OPERATION & INSTALLATION 80
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IMPORTANT TIPS!
1) Zephyr Xstream only supports the 24kHz sample rate in MPEG Layer-2. Therefore, the
Sample Rate menu does not have this option. The “L2 Half 64” Transmit and Receive
modes are used to achieve 24kHz operation in MPEG Layer-2.
2) The G.722 standard calls for a Sample Rate of 16kHz. This rate is used for G.722
regardless of the Sample Rate setting.
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COMPATIBILITY TIP!
Not all codecs support all sample rates. 32kHz is most commonly supported in MPEG Layer-
3 whereas 48kHz is more commonly used in Layer-2.
24kHz is sometimes seen in Layer-2. In this case set your Transmit or Receive to “L2
Half/24” and this Sample Rate will be used (regardless of the Sample Rate setting).
16kHz is used with G.722 and is automatically employed whenever G.722 is used.
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ZEPHYR CLASSIC VS XSTREAM COMPARISON!
Note: Not all Zephyrs support MPEG Layer-2. Very early units support MPEG Layer-3 and
G.722 only.
The Zephyr and Zephyr Express do not support MPEG Layer-2 at the 32kHz Sample Rate.
When communicating with a Zephyr or Zephyr Express in Layer-2, the 48 kHz sample rate
should be used.