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Mechanical Installation
µSDM-1RD / µSDM-1 / µSDM-1E IOM
4-12
Lightscape Networks Ltd. Proprietary
426006-2304-013-B1
Mounting the Digital Distribution Frame (DDF)
Rack mounted DDFs are available with Krone connectors for 120
Ω
twisted pair
wiring or 75
Ω
BT-43, DIN (Siemens), or BNC connectors for coaxial wiring (up to
63 x 2 Mbit/s).
4-10 shows an example of a rack-mounted DDF with BNC connectors.
Figure
4-10: Example of a rack-mounted DDF
Rack Grounding
The rack is connected to the utility ground bar with a ground cable according to
ETSI recommendations (top or bottom connection). The
µ
SDM-1 system subrack is
mounted on the rack with 4 holding screws and nuts, thus providing chassis
connection to ground.