3220-ddt & 3220-ddr.ib.doc
Page 9 of 12
24/03/2004
Installation
Pre-installation:
Handling:
This equipment may contain or be connected to static sensitive devices and proper static free handling precautions
should be observed.
Where individual circuit cards are stored, they should be placed in antistatic bags. Proper antistatic procedures
should be followed when inserting or removing cards from these bags.
Power:
AC mains supply: Ensure that operating voltage of unit and local supply voltage match and that correct rating
fuse is installed for local supply.
DC supply:
Ensure that the correct polarity is observed and that DC supply voltage is maintained within
the operating range specified.
Earthing:
The earth path is dependent on the type of frame selected. In every case particular care should be taken to ensure
that the frame is connected to earth for safety reasons. See frame manual for details.
Signal earth:
For safety reasons a connection is made between signal earth and chassis earth. No attempt should
be made to break this connection.
Installation in frame or chassis:
See details in separate manual for selected frame type.
ASI/SDI Inputs and Outputs:
Up to four ASI, SDI or a combination of both are fed into 75
Ω
BNC connectors on the rear connector panel of the
DDT-3220. Unused inputs are best terminated with a 75
Ω
termination to avoid spurious noise being sent to the
receiver where the front panel LEDs could illuminate and give the false impression that there is a signal on that
line.
The corresponding outputs are by 75
Ω
BNC connectors on the DDR-3220 rear connector panel. Output numbers
on the DDR-3220 correspond to the input numbers on the DDT-3220. There is no need to terminate the unused
channel outputs on the DDR-3220.
Fibre Optic Connection:
Warning
Optical Connections
The optical connectors on the DDT-3220 & DDR-3220 are attached to the main
module PCB, NOT the rear connector assembly.
When installing the optical fibre sufficient slack should be allowed for the module to
be withdrawn with the optical fibre attached until the connector is clear of the frame
and can be disconnected.
If this is not done, the module will not be able to be removed without first
disconnecting the optical fibre at the rear. Attempting to remove the module without
first disconnecting the fibre may result in damage to the fibre and / or the module.
