9
The AES3 output has two functions, depending on the setting of the dip switch
marked “aes” on the rear. It determines whether the audio content found at the
AES3 input is passed through to the output (“thru”) or not (“mute”). In “mute” mode
the AES3 data will be black and run at the rate selected for group 2. In “thru” mode,
the AES3 output will obviously run at the same rate as the AES3 input. On loss of
input signal, the output will remain at the same sampling rate.
The exact behaviour of the AES3 output in master mode depends on the use case:
1. No signal connected to the AES3 input. The AES3 output is a black signal (no
audio) with the same sampling rate as the Group 2 BNC outputs. The channel status
bits indicate “Grade 1 reference” if the CC1 has gone through the optional frequen-
cy calibration, otherwise “Grade 2 reference”. The AES lock indicator on the rear is
off.
2. A signal is applied to the AES3 input that is not synchronous to the CC1. The
AES3 output is a black signal with the same sampling rate as the Group 2 BNC out-
puts. The AES lock indicator on the rear blinks.
3. A signal is applied to the AES3 input that is synchronous to the CC1, but the “aes”
dip switch is set to “mute”. The AES3 output will still be black and synchronous. The
presence of the aes signal has no effect. In “master” mode with the “aes” dip switch
set to “mute”, any signal at the AES3 input is basically ignored, except that the “aes
lock” light on the rear will be on to indicate the presence of a synchronous input.
4. A signal is applied to the AES3 input that is synchronous to the CC1, and the
“aes” dip switch is set to “thru”. The AES3 output fully copies audio and subcode
data (but not the jitter!) from the AES3 input. In this mode the AES3 output will
never indicate “grade 1” as AES11 requires a black signal. The “aes lock” light is on.
5. If the input signal is lost from case 4, the sampling frequency setting is retained,
as sudden loss of signal is most likely accidental. This is different from case 1
where an AES3 input signal was never present. If the removal of the AES3 input was
on purpose, changing the group 2 multiple on the front will return to case 1, and
the AES3 output will once again be synchronous to the selected multiple of group 2.
Slave mode
Slave mode is the third setting on the leftmost selector. In slave mode, the CC1 will
look at the word sync input as well as the AES3 input for a valid signal. Slave mode
permits the following use cases:
1. Word sync only. Upon selection of slave mode, the CC1 selects the word sync
input. The middle and right selector once again set groups 1 and 2 to a multiple of
the base rate. The AES3 output will be black, synchronised to group 2 and the chan-
Summary of Contents for CC1
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