to normal after any partial or total network interruption such as power
loss or transient upset. The system shall automatically annunciate
communication failures to the operator with identification of the
communication link that has experienced a partial or total failure. A
communications controller may be used as an interface between the central
station display systems and the field device network. The communications
controller shall provide those functions needed to attain the specified
network communications performance.
1.2.2.1
Console Network
A console network, if required, shall provide communication between a
central station and any subordinate or separate stations of the system.
Where redundant central or parallel stations are required, the console
network shall allow the configuration of stations as master and slave. The
console network may be a part of the field device network or may be
separate depending upon the manufacturer's system configuration.
1.2.2.2
Field Device Network
The field device network shall provide communication between a central
control station and field devices of the system. The field device network
shall be configured as shown in the drawings. Field devices shall consist
of alarm annunciation local processors and entry control local processors.
Each field device shall be interrogated during each interrogation cycle.
The field device network shall provide line supervision that detects and
annunciates communications interruptions or compromised communications
between any field device and the central station.
1.2.3
Field equipment shall include local processors, sensors and controls.
Local processors shall serve as an interface between the central station
and sensors and controls. Data exchange between the central station and
the local processors shall include down-line transmission of commands,
software and databases to local processors. The up line data exchange from
the local processor to the central station shall include status data such
as intrusion alarms, status reports and entry control records. Local
processors are categorized as alarm annunciation or entry control or a
combination thereof.
1.2.4
CCTV System Interface
**************************************************************************
NOTE: The following interfaces are required only if
CCTV, intercom, or lighting systems are part of the
design.
**************************************************************************
An interface shall be provided for connection of the central station to the
CCTV system as specified in Section 16751A CLOSED CIRCUIT TELEVISION
SYSTEMS and as shown. This shall not be accomplished by using an
electro-mechanical relay assembly.
1.2.5
Intercom Interface
An interface shall be provided for connection of the central station to the
intercommunication systems as specified in Section 16721 INTERCOMMUNICATION
SYSTEM and as shown. This shall not be accomplished by using an
SECTION 13720A
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