Tieline Bridge-IT, User Manual

Page: 82 / 227

82 Bridge-IT Manual v4.0
© Tieline Research Pty. Ltd. 2019
Monitoring PPMs
Set audio levels so that audio peaks average at the nominal 0vu point indicated below on the PPM
meters. By default, the
PPM METERS on the front of the codec, or in the HTML5 Toolbox Web-
GUI, use dBFS to express nominal operating, headroom and noise floor levels.
The codec can also automatically adapt to different Tieline reference scales. A Tieline codec with
proprietary Tieline session data enabled will automatically adjust the reference level to suit G5 and
G3 codecs, or Report-IT. When connecting to a non-Tieline codec, or a Tieline codec without
session data enabled, the codec will use the
Tieline G5 reference scale setting.
The default Tieline G5 audio reference scale displayed on the PPMs is -38dBFS to 0dBFS (e.g.
Merlin, Genie, Bridge-IT and ViA codec families). Using this reference scale audio peaks can
safely reach 0dBFS without clipping, providing 18dB of headroom from the nominal 0vu point.
Mono and Stereo PPM Metering
When connected with a mono program the codec will display a mix of inputs 1 and 2 on
PPM1 . PPM 3 displays the level of return audio.