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Introduction
The bottom of the DSU encloses two redundant, online-replaceable, low-voltage, power
supply modules. The power supply modules service all three chassis and are individually
replaceable with no interruption of service.
All terrestrial data connections are located on the data switch module face of the DSU
(Figure 1-5). The breakout panel on the face of each data switch module supports a
variety of standard data and alarm interfaces. These interfaces support IBS, IDR, D&I, or
custom formats.
Ten modem data cable interfaces are located on the opposite face of the DSU (Figure
1-6); one for each of the eight prime and two backup satellite modems. Connectors J11
and J12 provide the interfaces for the SCU and IFU. The line cord receptacles for the
redundant power supply modules are located at the upper corners of the unit The spring-
loaded mechanical slide, associated with each supply, must be slid aside to insert the AC
line cord. Unless the power cord is disconnected, this slide performs two functions
retaining the power cord and preventing the removal of the module.
1–10
Figure 1-6. DSU/IFU Modem Side
SMS-7000 Modem Protection Switch
Rev. 3
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