3280-dda.ib.doc
page 3 of 16
23/07/2002
IRT Eurocard
Types DDA-3280
2 Mb/s G.703 Data Distribution Amplifier
&
ZDA-3280RH
Handshake changeover assemblie
General Description
The DDA-3280 data distribution amplifier is intended for use with data signals conforming to the ITU Rec. G.703 at
the 2.048 Mb/s rate.
The DDA-3280 is primarily intended for use in pairs with a double width rear assembly (ZDA-3280RH) for
automatic path protection applications.
Three outputs are provided at the rear of the module with an additional output for monitoring purposes on the front
panel. The primary output is controlled by relays to provide a bypass signal from the input in the event of a power
failure.
Indicators are provided on the front panel for:
Data loss
AIS detect (Alarm Indication Signal)
Module in service
Module in standby.
External alarm signals are also available on the rear of the module.
Changeover inhibit and changeover request switches are provided on the front panel for use where modules are
linked in pairs for redundancy. For this configuration the ZDA-3280RH dual rear assembly must be used.
When used as a line equaliser or distribution amplifier the DDA may be housed in any of IRT’s standard Eurocard
frames. When used in pairs for handshake operation only 3 RU chassis types may be used so that the two modules
are side by side. The double width rear assembly is designed specifically for this purpose and provides the best
return loss characteristics.
Details of frame types are available separately.
Applications:
•
Stand alone cable equaliser or distribution amplifier
•
Paired for redundant path protection switching
Standard features:
•
Input cable loss to –6dB @ 1024 kHz
•
Data regeneration & re-clocking
•
Monitor facility
•
Power fail bypass facility
•
External alarms and bypass
•
Redundancy handshake facility
•
IRT Eurocard construction compatible with other IRT Eurocard modules and frames
•
Dual power supply operation
Equipment provided:
Standard:
DDA-3280 Data distribution amplifier module.
ZDA-3280 Rear assembly for stand alone DDA-3280.
Accessories available:
ZDA-3280RH Double rear assembly
Connects two adjacent DDA-3280’s for automatic changeover of
for handshake:
all three outputs in the event of a fault being detected.
IRT
Communications
www.irtcommunications.com