Lynx AES16 - System Clock Rates Section; Digital Input Status Section

Lynx Mixer Reference
w System Clock Rates Section
This section of the Adapter Window displays real-time frequency measurements of system clocks. These
measurements are very useful for evaluating and validating both internal and external clock sources. When
synchronization or clocking issues are encountered, the user should refer to this information at the
beginning of troubleshooting. Note: the measured rates of the AES/EBU inputs are available in the Digital
Inputs section of the Adapter Window.
The sources of the system clocks begin measured are:
L/R Clock System sample clock generator word clock output
External External clock from CLOCK connection on I/O Port A
Header Clock signal from CLOCK IN header connector
LStream Clock signal from LStream port
PCI Computer’s PCI Bus speed (should always be about 33 MHz)
The Settings Menu offers a “High Resolution Clock Rate” option that provides three decimal places of
accuracy instead of the default single decimal place. With this option enabled, lower digits may fluctuate
rapidly as a result of measurement resolution. This is typically not an indication of clock jitter.
e Digital Input Status Section
This section displays status information pertaining to the AES16’s eight inputs. The data displayed
indicates the quality of the AES/EBU connections as well as channels status data sent by a transmitting
device. The information displayed in this section is very useful for troubleshooting digital input connection
issues. For more information about AES/EBU channel status data, refer to the AES-3 specification
available from the Audio Engineering Society web site at
http://www.aes.org.
Lock
Locked (green) Indicates the digital receiver is locked to a valid AES/EBU source
Unlocked (gray) Indicates the digital receiver is not locked to a valid AES/EBU source
When the Unlocked indicator is shown, all of the fields to the right will be blank.
Validity
Valid (green) Indicates the Valid channel status bit is set
Invalid (red) Indicates the Valid channel status bit is not set
The Valid bit is set by a transmitting device to indicate the validity of the audio data being transmitted. A
DAT machine for example may mark the data as invalid when it is not in play mode.
Parity
OK (green) Indicates accurate transmission of audio data
Error (red) Indicates an audio data error occurred during transmission
The parity bit is included in the AES/EBU data stream to validate the transmission of audio data. A parity
error indicates an audio data error was cased either by the transmitting device or the connecting cables.
CS CRC
OK (green) Indicates valid transmission of channel status data
AES16 User Manual 47