Hardware manual

Electra Elite Issue 8
System Hardware Manual 5 - 73
5.2 DPH(4)-U( ) ETU
5.2.1 Description
The DPH(4)-U( ) ETU provides connection for four
Doorphones (DP-D-1A), and also provides the associated
four Door Lock Release relays.
Doorphones and relays are paired together so that a
station user talking into a doorphone, controls only that
Door Lock Release relay when the feature code is dialed.
The DPH(4)-U( ) has two audio paths to be shared by four
doorphones. Two simultaneous doorphone calls are
allowed. Doorphones 1/3 and 2/4 are paired together.
5.2.2 Installation
Only one DPH(4)-U( ) ETU can be installed in any S1~S8
slot in any system KSU.
Figure 5-40 DPH(4)-U( ) ETU