3280-dda.ib.doc
page 13 of 16
23/07/2002
Internal Adjustments
The only internal adjustment that may be made by the user is link LK 1, which may be set to disable AIS detection if
required.
This module uses a programmable logic device as the main processing circuit. This device must be correctly
programmed is only obtainable through IRT. No attempt should be made to substitute other devices or to
programme a similar device as this could cause extensive damage to the module.
Installation
Installation in frame or chassis:
See details in separate manual for selected frame type.
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 600 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
K 1 relay status - connection to ground indicates module is in bypass mode.
2
K 2 relay status - connection to ground indicates module is
Main
in handshake mode.
3
External changeover request - connection to ground will make this module
Main
in
handshake mode.
4 Ground.
IRT
Communications
www.irtcommunications.com
