INSTALLING MULTIPLE AV102 INTERCOMS : AUTO-ZONING USING
ADPRO REMOTE TRANSMITTER AND AVS BINREL02 SWITCHER
If you wish to use
many
AV102SS intercoms on a site, you may connect the AVPSU4
units (which come with each AV102SS intercom) as shown in the diagram below.
The advantage of this configuration is that the site cabling is isolated from the equipment
at both ends. The call-button wiring is opto-isolated, and the audio signals are transformer
isolated. This provides a high degree of protection against unwanted voltage which may
appear on the site cabling, and which could otherwise result in damage to the sites’
security equipment. The audio transformers also provide both a balanced-line signal path
between the intercom and the AVPSU4 (reducing noise pickup), and a “Ground Lift” which
prevents the familiar “Ground Loop Hum” problem which plagues some installations.
SITE WIRING BETWEEN INTERCOMS AND EQUIPMENT ROOM
DOCUMENT NUMBER AV102SS/OEM/01 REVISION 6.1 1st August 2006 Page
13
of 22
