Part Xiii Input Configuration, Levels And Ppms - Codec Tieline Gateway User Manual

13 Input Configuration, Levels and PPMs
Product
Gateway 4
Gateway 4
Gateway 4
Gateway
8/16
Gateway
8/16
Gateway
8/16
Important Note: See
Input audio functions can also be configured using the Toolbox Web-GUI; see
Input/Output Settings
Adjusting PPM Meter Reference Scale Settings
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 G6 reference scale setting.
The default Tieline G6 audio reference scale displayed on the PPMs when connecting to a Tieline
G6 codec is -40dBFS to 0dBFS. Using this reference scale audio peaks can safely reach 0dBFS
without clipping, providing 20dB of headroom from the nominal 0vu point. The comparison table
below outlines the reference scales for G6, G5, G3 codecs and Report-IT in dBFS, as well as the
equivalent dBU scale.
The audio reference level settings in the codec are:
Reference
Level
1 Tieline G6
(Gateway,
Gateway 4)
2 Tieline G5
© Tieline Research Pty. Ltd. 2021
Feature Notification
PPM Meters 8 PPMs on front panel display 4 channel inputs/outputs or
encoders/decoders
Inputs 4 Channels in/out
Inputs Inputs 1-4 can be configured as analog or digital inputs (AES3 or
AES67) in pairs
PPM Meters 16 PPMs on front panel can display inputs, or outputs, or
encoders, or decoders
Inputs 8-16 Channels In/Out (depending on configuration purchased)
Inputs Inputs 1-8 can be configured as analog or digital inputs (AES3 or
AES67) in pairs
Configuring AES3 audio
for more information.
Gateway-16 Codec PPMs Displayed
Description
PPM meter low point
Nominal 0vu reference level
Level at which audio will clip/distort
PPM meter low point
Gateway and Gateway 4 Manual v1.2
for more information about digital in/outs.
35
Configuring
dBu dBFS
-16dBU -40dBFS
+4dBU -20dBFS
+24dBu 0dBFS
-16dBu -38dBFS