Comtech EF Data SMS-7000 - Manual (Page 29)

SMS-7000 Modem Protection Switch Introduction
Rev. 3 1–9
1.2.2 Data Switch Unit (DSU)
The DSU performs terrestrial data switch and breakout panel functions. Enclosed in a
shallow 4.5-inch (11.4 cm) deep chassis, the DSU is designed to mount within the rack in
several ways. This will accommodate particular rack configurations and user terrestrial
cable routing.
The DSU (Figure 1-5) may be equipped with up to eight data switch modules—one per
prime modem as required. The modules may be removed and replaced on site, or they
can be added later for configuration expansion. In addition to performing prime and
backup data switch functions, each module incorporates a configurable breakout panel
that steers the desired terrestrial data interfaces to a single modem I/O data connector.
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Figure 1-5. DSU/IFU Terrestrial Side