17.2. ADIU - Attenuation of DIUC trunk circuits (CIS) 
Feature:
This COT parameter is responsible for the amplification of DIUC trunk circuits for
CIS.
Function:
If this parameter is set the relevant DIUC trunk circuits is amplified.
Amplification is required for a connection of a digital trunk group to an analog local
exchange. The amplification is carried out in the OpenScape 4000, as the converter
of the
analog local exchange cannot be set to a higher level. Although it is only required
for
incoming connections (voice), it has to be set for all connections.
If this parameter is set the TREF matrix is read.
Device types:
DIUC trunk circuits