3020-dda.ib.rev0.doc
Page 3 of 17
09/03/2006
IRT Eurocard
Types DDA-3020
155 Mb/s G.703
(STM-1)
Data Distribution Amplifier
&
ZDA-3021RH
Handshake changeover assembly
General Description
The DDA-3020 data distribution amplifier is intended for use with STM-1 data signals conforming to the
ITU Rec. G.703. The DDA-3020 is primarily intended for use in pairs with a double width rear assembly
(ZDA-3021RH) for automatic path protection applications, although it is supplied as standard with its own rear
assembly for stand-alone applications.
Four outputs are provided at the rear of the module with an additional output for monitoring purposes on the front
panel. One output (O/P 3) 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-3021RH double width rear assembly is needed to
link the logic sections of two modules.
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 double width
rear assembly may be used.
The DDA-3020 is also equipped with Simple Network Management Protocol (SNMP) monitoring so that status and
alarms can be remotely monitored and controlled via an Ethernet connection. This function is only available when
the unit is housed in an IRT 4000 series frame fitted with the SNMP agent module, CDM-4000.
Details of frame types are available separately.
Applications:
•
Stand alone cable equaliser or distribution amplifier
•
Paired for redundant path protection switching
Standard features:
•
Adaptive cable input equalisation
•
Data regeneration & re-clocking
•
Monitor facility
•
Power fail bypass facility
•
External alarms and bypass
•
Redundancy handshake facility
•
Simple Network Management Protocol (SNMP) monitoring
•
IRT Eurocard construction compatible with other IRT Eurocard modules and frames
•
Dual power supply operation
IRT
Communications
www.irtcommunications.com
