Zhone Technologies IMACS Network Device - Manual (Page 69)

Zhone Technologies, Inc. IMACS Product Book, Version 4
March 2001 Page 65
V. Alarm Cards
The Model 840xxx Alarm Cards provide the capability to input external alarm signals to the IMACS and to output
alarm signals from the IMACS to an external device. Depending on the model, from 3 to 28 alarms may be input
and from 4 to 14 alarms can be output.
The alarm input sensors are current loop detectors, with an operating range of 4 to 20 mA detection. Input sensors
can be selected as active (they both supply and detect current and, therefore, can not be isolated and provide surge
protection only) or passive (current sense only, completely isolated passive current detectors). When selected as
passive sensors, the current source is provided externally and the sensors are Opto-isolated from the source of the
alarm. If the sensors are configured as active, they can provide current source for the loop as well as current
detectors, not isolated from the external loop. Depending on the model, power for active sensors can originate from
network battery (usually +48 VDC) or system voltage (+12 VDC).
Input alarm conditions are reported on the Active Alarm screens, and may be logged and/or reported in the same
manner as other IMACS alarms. Alarm reporting can be in the form of an ASCII string or an SNMP trap,
depending on the network configuration and host software options installed.
Alarm signals are output via dual-pole, double throw relay switches. Depending on the model, these relays may be
of Form A (normally open), Form B (normally closed), Form C (switched) or a combination of Form A, B and C
contacts. All alarm outputs are relay-isolated. Power for these circuits must be provided externally.
The alarm contacts are connected to the external alarm equipment through on or more (depending on model) 50-pin
Amphenol connectors located on the front panel of the Alarm Card.
The Alarm card model 840160 provides 4 input sensors and 4 output Form C closures. It can use either +48VDC or
+12VDC to power the input sensors. If +12VDC is used, care must be exercised not to ground the circuit. The
840160 card model also has a -12VDC strapping option that allows it to be used in either European (CE Mark)
systems or in US systems.
The Alarm card model 840260 provides 3 input sensors and 3 output Form C closures, one of which can only be
used to signal power failure of the unit. It can use either +48VDC or +12VDC to power the input sensors. If
+12VDC is used, care must be exercised not to ground the circuit. The 840260 card model also has a -12VDC
strapping option that allows it to be used in either European (CE Mark) systems or in US systems.
The Alarm card model 840360 provides 28 input sensors and 14 output closures (4 Form A, 2 Form B and 8 Form
C). It can use either +48VDC or +12VDC to power the input sensors. If +12VDC is used, care must be exercised
not to ground the circuit. The sensors are grouped into two groups of 14 each for the purpose of selecting current
source, either from the network battery or the system. Within each group, an alarm sensor can be independently
configured for active or passive operation. The 8403 also has a -12VDC strapping option that allows it to be used in
either European (CE Mark) systems or in U.S. systems. Additionally, it also includes a buzzer to provide an audible
alarm. The buzzer can be sounded locally. This capability allows a remote site to transmit an audible alarm. The
840360 also provides a single FXS phone interface that provides a “Voice Order Wire” capability from a remote site
and the voice channel can be transported being via a time slot to a central site. This connection is Loop Start only,
with the “ring” signal being indicated through the buzzer, and is presented via an RJ-11 jack located on the front
panel of the Alarm card. The buzzer and the phone must both be configured to use the same time slot, but only one
of the functions can operate at any time.