The DDA-4280 data distribution amplifier, available from IRT Electronics , is intended for use with E1 data signals conforming to the ITU Rec. G.703. The DDA-4280 data distribution amplifier is primarily intended for use in pairs with a double width rear assembly for automatic path protection applications. The DDA-4280 data distribution amplifier 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 1) 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
- Module in service (Main)
- Module in standby
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 double width rear assembly is needed to link the logic sections of two modules.
When used as a distribution amplifier, the DDA-4280 data distribution amplifier may be housed in any of IRT Electronics standard Eurocard frames. When used in pairs for handshake operation, 3 RU chassis types are used so that the double width rear assembly can be used.
The DDA-4280 data distribution amplifier is also equipped with Simple Network Management Protocol (SNMP) monitoring, so that status and alarms can be remotely monitored and controlled through an Ethernet connection. This function is only available when the unit is housed in an IRT 4000 series frame fitted with an SNMP agent module.
The DDA-4280 data distribution amplifier has the following features:
- 2.048 Mbps (E1) G.703 data distribution amplifier
- Data regeneration with Jitter attenuator
- Front panel monitoring facility
- Protection switching facility
- External alarms and bypass
- Redundant pair operation capability
- Simple Network Management Protocol (SNMP) monitoring
- Compatible with other IRT Eurocard modules and frames