1559Chapter 43
Intercoms
by Glen Ballou
43.1 General Purpose Intercoms............................................................... 1561
43.1.1 Point-to-Point Systems............................................................... 1561
43.1.2 Matrix Systems..................................................................... 1562
43.1.3 Apartment Security/Intercom Systems................................................... 1563
43.1.4 Residential Intercom Systems.......................................................... 1564
43.1.5 Commercial Security Systems.......................................................... 1564
43.1.5.1 Zone Paging.................................................................... 1564
43.1.5.2 Security Audio Monitoring........................................................ 1564
43.1.5.3 Emergency Crisis Communications................................................. 1566
43.1.6 Commercial/Industrial Systems........................................................ 1566
43.1.7 Wireless Intercoms.................................................................. 1569
43.2 Broadcast Intercoms.................................................................... 1569
43.2.1 Broadcast Point-to-Point Systems....................................................... 1570
43.2.2 Broadcast Party Line System.......................................................... 1570
43.2.3 Broadcast Matrix Systems............................................................. 1571
43.2.4 Program Interrupt (IFB).............................................................. 1573
43.2.5 Wireless Broadcast Intercom System.................................................... 1574
43.2.6 Belt Packs......................................................................... 1575
43.2.7 Telephone Interface.................................................................. 1575
43.2.8 Headsets........................................................................... 1575