Telenetics RM16M - Versatile Rack Mounting Chassis, Installation And Operation Manual

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Installation
Page 8
in the Data Shelf, converting user-supplied 48 volt DC input to + 15
Vdc,
−
15 Vdc, and +8.5 Vdc outputs for distribution to the PC cards.
Regulators on the PC cards convert the plus and minus 15 Vdc to plus
and minus 12 Vdc and + 8.5 Vdc to +5 Vdc.
NOTE: If two power modules are installed in the DC version of the
Data Shelf, one powers the Data Shelf while the other acts as a
redundant power source.
Figure 1-1 shows an example of the location and orientation of the
modem cards and power module. For convenience, the front panel of
the Data Shelf is hinged to allow easy access to the modem cards and
power module(s) without disturbing the DTE and communication-line
connections at the back of the Data Shelf.
Figure 1-1. Data Shelf Example