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Version 0.7 2/9/05
34
If PSTN or ISDN are used as a backup then the system
complies with Performance Criteria ATS 4. The ARC should
enable monitoring of this connection.
The IRIS Diallers have been assessed and certified against these standards by
Telefication B.V.
15.3 Safety
Care should be taken that when interconnecting telecommunications equipment
that only like interfaces are interconnected to avoid safety hazards.
The interfaces on the IRIS Dialler have the following safety classifications:
ISDN Interface: TNV operating at SELV and suitable for connection to Basic rate
ISDN interfaces provided by a Public Telecommunications Operator or a Private
Branch exchange or similar equipment.
PSTN Interface: TNV suitable for connection to analogue PSTN interfaces by a
Public Telecommunications Operator or a Private Branch exchange or similar
equipment.
Tel Interface: SELV suitable for connection to the TNV interface of a single line
telecommunications equipment such as telephones, faxes etc.
Data Interface: SELV suitable for connection to SELV interface on a data
terminal such as a PC COM port.
Power Interface: SELV for connection to a 12V DC supply.
Inputs and Outputs: SELV for connection to alarm output and input pins.
TNV (Telecommunications Network Voltage) is defined as a circuit that
under normal operating conditions carries telecommunications signals (70.7V
peak or 120V dc maximum).
SELV (Safety Extra-Low Voltage) is defined as a secondary circuit which
is so designed and protected that under normal and single fault conditions the
voltage between any two accessible parts does not exceed a safe value (42.4V
peak or 60V dc maximum).
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