Hardware manual

Electra Elite Issue 8
System Hardware Manual 5 - 155
7.10 PBR( )-U( ) ETU
7.10.1 Description
The Pushbutton Receiver (PBR) ETU detects and
translates DTMF tones generated by Single Line
Telephones, modems, or facsimile machines. This ETU is
required when the four built-in CPUB( )-U( ) ETU PBR
channels are not enough to support all the PBR
requirements of the system, or the CPUB( )-U( ) ETU PBRs
are dedicated to the VRS(4)-U( ) ETU.
Figure 5-74 PBR( )-U( ) ETU