RECOMMENDATION ITU-R BS.645-2 - Test signals and metering to be used on international sound programme connections
1 Alignment signal (AS)
2 Measurement signal (MS)
3 Permitted maximum signal (PMS)
ANNEX 1 - Alignment using the recommended test signals with peak programme meters and vu meters
ANNEX 2
ANNEX 3 - dBu0s and dBrs terminology
3.1 dBu
3.2 dBr
3.3 dBu0
3.4 dBrs and dBu0s