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Specifications
Release 3.3 89
• Fiber Interface Modules (FIMs): The DSU cabinet holds up to two fiber interface modules
(FIMs). Each FIM supports two DSU cards; the FIM installed in Shelf 1, slot 1 supports
the DSU cards in Shelf 1, slots 2 and 3. The FIM in Shelf 1, slot 6 supports the DSU cards
in Shelf 1, slots 4 and 5.
• DSU Cards: The DSU cabinet holds up to four DSU cards. These are intelligent cards that
provide specialized digital functions. The DSU cards are installed in Shelf 1, slots 2 to 5.
• DSU Backplane: The backplane holds up to four DSU cards, two fiber interface modules,
two peripheral resource cards, the power supply cable, and two Maintenance Terminal
ports. The four DSU cards are split into pairs (each pair with a FIM, Peripheral Resource
card, and maintenance port). The following switches and connectors are located on the
DSU backplane (rear panel):
- A power on/off switch
- A small red sliding switch for selecting the input power source. The switch can be set
to either 115 Vac, 60 Hz or 230 Vac, 50 Hz.
- A 3-conductor male receptacle to connect AC power
- A sliding panel for the Tx and Rx fiber optic cables
- Two RS-232 Maintenance Terminal ports
- A 3 inch wide x 4 inch high (7.6 cm x 10.2 cm) metal box projecting from the middle
of the panel. The box holds up to four CEPT or DS1 Interface Assemblies.
CAUTION: Do not connect any devices to the female power receptacle.
Digital Service Unit Dimensions
Digital Service Unit Environment
Physical Dimensions
Height 19 inches (48.0 cm)
Width 9 inches (22.9 cm)
Depth 16.5 inches (42.0 cm)
Weight 40 lbs (18.0 kg)
Storage Environment
Condition Specification
Temperature -40º to 150ºF (-40º to 66ºC)
Humidity 5-95% Relative Humidity, non-condensing
Vibration
0.5 g, 5 to 100 Hz, any orthogonal axis
1.5 g, 100 to 500 Hz, any orthogonal axis
Mechanical Stress One 20.3 cm (8 inch) drop, each edge and corner adjacent to the rest
face – unpackaged
Horizontal Transportation
Impact Stress
One shock pulse applied on each face perpendicular to the direction of
motion of the transporting vehicle; the shock pulse is a half-sine
acceleration 30 g peak, 20 ms duration