DDA-4320 & ZDA-4320RH Instruction Book
Revision 7
www.irtelectronics.com
Page 9 of 16
4320-DDA_ib_Rev7.doc
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.
Stand-alone Operation:
Input & Outputs:
For use with supplied standard rear assembly (ZDA-4320).
Input and Outputs are 75 Ω BNC type for connection with high quality 75 Ω coaxial cable. Input is self-terminating.
A relay bypass is provided on the rear assembly between the Input (SK2) and Output 6 (SK3), the output connector
closest to the input connector. Should the card be removed from the rear assembly mounted within the frame, or
if a power failure occurs, the input signal will still pass through to this output. For situations requiring a “critical”
path, connect to Output 6 (SK3).
Stand-alone Alarm Connections:
A 3-pin Phoenix style screw connector (PL2) is provided on the rear assembly of the module providing the following
alarm conditions:
Pin 1
Input Alarm
10
–an open circuit indicates that there is no input signal present, input
signal does not match the set signal type, AIS is detected in STM-1 data, or power
to the module has failed.
2
Power Fail
10
– an open circuit indicates that power to the module has failed.
3
Ground.
NOTE:
10 The non-alarm state is a connection to ground via a FET relay.