User manual

Appendix A: Specifications
AM700 Audio Measurement Set User Manual
A-49
Table A-24: Digital Interface Tester
Capabilities Description
Intended Use The digital interface tester application is used to
monitor and troubleshoot the digital audio inter-
face. It allows you to view incoming data streams
at the logical (bit), or electrical interface level, and
to create special signals to probe the interface.
Number of Primary Modes There are four major modes of operation.
Bit Activity Displays instantaneous bit probability (with no
history or averaging) of each bit of each
subframe. The four preamble bits are not avail-
able to be displayed, and are grayed out in the
display.
Channel Status Displays the current contents of the 192 channel
status bits in both subframes of the digital input
stream. The data can be displayed in four styles:
Binary (most-significant-bit or MSB on the left)
Transmission order (MSB on right)
Hex (same bit order as binary, displayed in
base 16)
Decoded (raw data translated into words)
In the raw and decoded styles, the user can
optionally underline data elements which differ
between the two subframes. This allows a quick
visual check for identical subframe information.
The user can choose to display either the
subframe 1 data, the subframe 2 data, or both
subframes.