Chapter 1. System Overview and Modes of Operation
12
Power Supplies
-48 Volt DC Power Supplies
Two DC power supplies can be used to provide redundancy. In a redundant system, both power
supplies share the work. If one fails, the other automatically assumes the full load. In such a
configuration, either power supply can be inserted or removed without interrupting service.
Some applications require two power supplies for normal operation, as with Subrate Data
Multiplexer (SDM) line cards. In such cases where more than 12 data line cards require the use
of both power supplies, redundant operation is not possible.
The power supplies are designed to withstand a reverse polarity input connection without
sustaining internal damage.
The -48 V DC power supplies provide the following:
· Power-on indicator · Alarm reference voltage regulator
· Power supply voltage monitor circuitry · Alarm detect fuse failure and power supply fail
indicator circuitry
The power supply has built-in over-voltage and under-voltage failure detection circuitry. It
monitors +5 V, -5 V, +12 V, and -12 V outputs, and will initiate an alarm if the voltages are
approximately 10 percent out of tolerance.
-24 Volt DC Power Supplies
-24 V DC power supplies are available for special applications. They provide the same features
as the -48 V DC supplies, and operate with the line cards shown in Appendix B. -24 Volt
Compatibility. The Dual CSU interface, with integrated CSU capability (part numbers 30318-101,
30318-102, and 30318-103), will not operate in -24 V DC powered systems.
110 Volt AC Power Supply
An AC power supply is available for customer premise applications where only standard 110 V
AC power is available. Coastcom currently offers an AC/DC self-contained single-slot power
supply that provides all of the voltages necessary to operate a D/I Mux III - except ringing voltage.
When configured with FXS feature cards, a modular Ringing Generator 30333-101 will also be
needed. Provides +/-12, +/-5, and -48. Can be used in 8, 12 and 24-slot shelves. Replaces a
30308-102A and the combination option of 30315-105A with 30338-103A. Cannot be used in
combination with any other power supply.
NOTE: Previous to August of 2005, Coastcom offered two AC power supplies:
• The 30315-105 110 Volt AC supply worked in conjunction with the 30338-103 -48 V DC
power supply. It occupied one power supply card slot, and converted AC power into -48 V
DC. The -48 V DC power supply used the -48 V DC supplied by the AC power supply and
converted it into the required voltages normally used by 12-slot shelves.
• The 30308-102 AC power supply occupied both power supply card slots in a D/I Mux III 8-
slot or 24-slot shelf, and was not available for 12-slot shelves. The 30308-102 supplied all
the voltages required by the D/I Mux III, and allowed software voltage checks.
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