3020-dda.ib.rev0.doc
Page 12 of 17
09/03/2006
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.
Signal Connections:
G.703 data connections - stand alone operation:
Connect the input and as many output connections as required.
Only good quality 75 Ohm connectors and cable should be used. The use of 50 Ohm BNC connectors may cause
serious reflection problems with G.703 signals, causing data errors.
In general cable runs should be kept as short as possible and should not exceed 200 metres for reliable error free
operation.
G.703 data connections - handshake operation:
See separate section on handshake operation.
Alarm and external changeover connections:
A Krone type connector is provided on the rear panel of the module providing the following:
Pin 1
Loss of power - connection to ground indicates module is in bypass mode.
2
General Alarm - connection to ground indicates a loss of input or AIS detection.
3
External changeover request - connection to ground will make this module
Main
in
handshake mode.
4 Ground.
IRT
Communications
www.irtcommunications.com
