Telos Zephyr Xstream User Manual page 48

AES/EBU Inputs & Outputs
These are inputs and outputs for AES/EBU format digital audio signals. More information about
the various menus related to their operation is in Section 5 (Guided Tour of the Menus) and
Section 11 (Detailed Menu Reference).
AES In (Send to Network)
The input is internally sample‐rate converted, so may accept sources at any of the usual rates
(32, 44.1, or 48kHz).
A digital gain adjustment can be used to alter the signal levels into the codec section. Levels can
be increased or decreased by up to 12dB to allow for equipment variation. This is the Gain Trim
selection of the AUDIO menu.
AES Out (Receive from Network)
The output may be synchronized and sample‐rate converted to either the input AES signal's
frequency, or the frequency of an independent sync signal presented at the Sync In connector.
This selection is made in the AUDIO menu. See Section 11 (Detailed Menu Reference) for details
on this menu option.
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DEEP TECH NOTE!
The Sample Rate conversion and AES Sync capabilities allow you to prevent problems with
"clock slip" due to different clock rates within a digital facility. Typically a "house clock"
reference would be fed to the SYNC IN jack of the Zephyr Xstream, as well as to other
equipment, to prevent drop outs due to buffer "overflow" or "underflow" conditions.
It is important to understand that while the Zephyr Xstream provides frequency
synchronization, it does not provide byte alignment. Your digital mixing equipment should
provide this capability, if required.
AES Sync‐In
This jack allows the user to provide an AES/EBU house frequency reference that the Zephyr
Xstream can use to match its AES/EBU signal to. The synchronization is accepted from a
standard AES/EBU format signal. Only the sync information is stripped; any audio which may be
present is ignored.
USER'S MANUAL
Section 3: GUIDED TOUR of the HARDWARE 36