Chapter 3. Installation
97
Smart 110 V AC Power Supply (P/N 30308-102) (this product has been put on “end-
of-life” status)
The older model 110 V AC Power Supply (P/N 30308-102) is a fully self-contained unit that provides
all of the voltages necessary to operate any type of D/I Mux III configuration. It operates from 110 V
commercial AC power. The Smart AC Power Supply has seven regulated voltage outputs. Each
output will recover automatically from overload or short circuit conditions. It has a smart interface
with the D/I Mux III CCU/AMCU, and can be monitored locally or remotely for performance
parameters.
When installed, the Smart 110 V AC Power Supply occupies both vertical power supply slots of a D/I
Mux III shelf. It cannot be used in a D/I Mux III 12-slot shelf because the physical layout requires two
adjacent power supply card slots.
Test Points, Indicators and Fuses
The front panel has green LEDs to indicate the presence of primary power and ringing voltage,
and a red LED to indicate unit failure.
Seven tip jack test points are accessible from the front panel to monitor the power supply outputs.
Each test point is protected by a short circuit resistor. To obtain accurate voltage readings, use a
high impedance AC/DC voltmeter.
The primary AC power is internally fused. The shelf's -48 V signalling battery supply is protected
by a front panel user-replaceable 3AG type glass fuse.
Smart Interface
The 30308-102 Smart Interface consists of a microcontroller, a watchdog timer, a provisioning
bus interface, an analog-to-digital converter with a companion voltage reference, and a
programmable memory that retains unit identification information. Each power supply output is
measured and reported to the CCU/MCU. The system operator can monitor each power supply
output voltage from the system control terminal. This information, in conjunction with an alarm
report from the D/I Mux III, can be used to isolate and correct system problems.
Power Supply Failure and Minor Alarm
An isolated, normally open pair of relay contacts on the rear of the multiplexer shelf, labeled as
Minor Alarm connections, are controlled by the Smart Interface. These contacts can also be
closed by a command from the CCU/MCU indicating a Minor Alarm condition. (The power supply
illuminates the red Major LED, and closes these contacts when an output voltage is out of
tolerance.) Power supply failure is also reported to the CCU/MCU. If the failure is not related to
the supply voltages for the CCU/MCU, the Smart Interface will continue to display information.
To maintain compatibility with earlier D/I Mux III systems, the Smart Interface also responds to
polling requests from CCUs/MCUs with earlier system control software. The same features are
supported, except that earlier software does not support control terminal display of individual
output voltages.
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