Mutec iclock, Operating Manual

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Manual SDs-01 D 3.2.2003 17:45 Uhr Seite 16
22
Example
There are AES3/-11 receiver circuits causing
problems when synchronizing to AES11
blank frame signals. This usually results in
increased jitter and signal instabilities. En-
abling a DC-offset level in the AES11 blank
frame signal will allow for synchronizing any
AES3/-11 input stage. This level can normally
be processed without problems by the con-
cerning AES3/-11 input stages, thus ensuring
reliable synchronization.
DIST does not provide redundancy for the
AES/EBU outputs. If the external AES/EBU or
S/P-DIF clock source fails, the associated
AES/EBU-output pair will fail, too!
If the consumer format is selected, the
physical parameters of the output terminals
(balanced operation, level, and impedance)
will remain unchanged!
The functions and settings displayed on the
AES menu pages are automatically adapted
with regard to the channel-status bits of the
consumer format.
DIST
(setting)
DISTRIBUTION This setting allows for forwarding an input AES3 or S/P-DIF
signal to the selected AES/EBU output pair using a hardware bypass. As no
adjustments can be made in this mode, the other functions and parameters
will be hidden, and the second menu page of the AES/EBU pair will not
be accessible; the parameters and functions can only be accessed after the
internal AES11 generator has been enabled by selecting a different clock
rate.
In this mode, the synthesizer synchronizes to the input AES3 or S/P-DIF sig-
nal; thus, the video and audio clock signals provided at the other outputs
are linked with phase lock to the input signal.
WORDL
(function)
WORD LENGTH This function allows for changing the word length stored in
the channel status bits (byte 2, bits 3, 4 and 5) of the clear-frame signal of
the selected AES/EBU output pair. The factory default is 24BITs.
16BITs, 18BITs, 20BITs, 24BITs
(setting)
One of four word lengths between 16 and 24Bits are available for selection.
FORMAT
(function)
FORMAT This function allows for altering the AES format stored in the
channel status bits (byte 0, bit 0) of the blank frame signal of the selected
AES/EBU output pair. The factory default is PROF.
PROF, CONS
(setting)
PROF, CONS This setting allows for toggling the AES11 blank frame signal
between consumer (CONS) and professional (PROF) formats.
DCSET
(function)
DC OFFSET This function allows for applying a DC-offset signal level of
approx. 200 mV to the output AES11 blank frame signal.
ON, OFF
(setting)
This will enable (ON) or disable (OFF) the DC-offset signal level in the
AES/EBU blank frame signal.
Functions and settings on the second page of each AES/EBU output pair:
AUDIOSTAT
(function)
AUDIOSTATUS This function allows for setting the audio status stored in the
channel status bits (byte 0, bit 1) of the blank frame signal of the selected
AES/EBU output pair. The factory default is NONAUDIO.
NORMAUDIO, NONAUDIO
(setting)
These settings allows for selecting the norm-audio or non-audio statuses.
REFSTAT
(function)
REFERENCE STATUS, This function allows for changing the reference status
stored in the channel status bits (byte 4, bits 0, 1) of the blank frame signal
of the selected AES/EBU output pair. The factory default is G1-REF.
G1-REF
(setting)
GRADE 1 REFERENCE With this setting (grade 1 reference), the AES11 blank
frame signal is output in compliance with AES11, Grade 1.
G2-REF
(setting)
GRADE 2 REFERENCE With this setting (grade 2 reference), the AES11 blank
frame signal is output in compliance with AES11, Grade 2.
NO REF
(setting)
NO REFERENCE This setting indicates that the AES11 blank frame signal is
not a reference signal compliant to AES11.