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3–8
AlphaServer Intelligent Peripheral Platform Hardware Owner's Guide
3.3.4
ISA Bus Expansion Chassis
The AlphaServer IP Platform supports a variety of voice/telephony options through the
addition of an ISA bus expansion chassis. The ISA bus expansion chassis is configured with a
20-slot ISA backplane. The EISA to ISA bridge uses one slot and the remaining 19 slots are
available for telephony options. The ISA bus expansion chassis has the following
characteristics:
•
Conforms to ISA bus specifications
•
Contains an ON/Off power switch for removing power for servicing
•
Contains an alarm sensor module for monitoring
–
Chassis temperature
–
Chassis voltage
–
Cooling fan rotation
•
Connector for communication with the alarm control module installed in the AlphaServer
1000A system
•
Slide mounted to allow front access to all modules
•
430 W power supply to support maximum output voltages (to voice boards) and
capacities as shown in the following table.
Voltage Amps*
570
-5 1.0
12 5.0
-12 1.0
* Provided that the maximum
output power does not exceed the
power supply rating.
•
Contains a load module to provide minimum power supply pre-load (4.2 A @ +5 V).
This module may be removed from the ISA bus expansion chassis when the minimum
power supply pre-load can be attained with the installed telephony options.
Each simplex system contains one ISA bus expansion chassis. Each duplex system contains
two ISA bus expansion chassis. A connector on the alarm control module is dedicated to
bringing in physical alarm signals from the ISA bus expansion chassis. Any of the alarm
events listed above cause the alarm subsystem to generate an interrupt to the system software
in order to update the alarm database and also send alarm signals to the alarm indicator panel
for display.