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DISTRIBUTION AMPLIFIERS G.703

DDA-3020   155Mb/s (STM-1) G.703 Data DA
ZDA-3021RH    Double Rear Assembly for Handshaking 2 x DDA-3020's
DDA-4301    (E3 / DS3) G.703 Data DA
ZDA-4300RH   
Double Rear Assembly for Handshaking 2 x DDA-4301's

DDA-3020 155 Mb/s G.703 (STM-1) Data Distribution Amplifier

Features
  • Adaptive cable input equalisation.
  • Data regeneration.
  • 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.

General

The DDA-3020 data distribution amplifier is intended for use with STM1 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:

DC power
Data loss
AIS detect
Module in service
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 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.

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ZDA-3021RH Handshake connection 155 Mb/s Data Amplifiers

Features

Applications:

  • Redundant pair operation.
  • Protection switching facility.
  • External alarms from each module.
  • One output bypass on power loss

General

The DDA-3020 is a 155Mb/s G.703 (STM-1) distribution amplifier that incorporates a protection switching facility for the switching in of signals from a standby module when a fault is detected.
To facilitate this mode of operation, the ZDA-3021RH provides all of the required signal and logic interconnections between two DDA-3020 modules.
The individual module alarms are also provided for remote monitoring purposes.
Three switched and two non-switched outputs are provided at the rear of the module with an additional output for monitoring purposes on each front panel. One output (O/P 3) is controlled by relays to provide a bypass signal from the input during a power failure.

A loss of input signal or an Alarm Indication Signal (AIS) detected in the data stream generates a changeover request for a companion unit. In addition, the module may be forced into bypass mode by an external signal.
Changeover-inhibit and changeover-request switches are provided on the front panel for local manual control.

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DDA-4301  E3/DS3 G.703 Data Distribution Amplifier

Features

  • G.703 compliant.
  • For either E3 or DS3 G.703 data rates.
  • Adaptive cable input equalisation.
  • Data regeneration.
  • Front panel monitoring facility.
  • Protection switching facility.
  • External alarms and bypass.
  • Redundant pair operation capability.
  • Optional SNMP capability.
 

The DDA-4301 is a data distribution amplifier that operates in accordance with the G.703 specification. Either E3 (34.368Mb/s) or DS3 (44.736Mb/s unframed or 44.210Mb/s framed) data rates are possible by an on board switch selector.
The DDA-4301 incorporates a protection facility for switching to signals from a standby module when a fault is detected.
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 during a power failure.

An on board switch setting allows an Alarm Indication Signal (AIS) detected in the data stream to generate a changeover request for a companion unit.

On loss of the input, the output can be set to give either no signal or an AIS signal output.

Indicators are provided on the front panel for:

DC power
Data loss
AIS detect
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, a special double width rear assembly (type ZDA-4300RH) is available to link the signal and logic sections of two modules.

Monitoring via a simple network management protocol (SNMP) is optionally possible when fitted with a plug-in SNMP board and run in an IRT 4000 series frame fitted with SNMP capability.

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ZDA-4300RH     Handshake connection -  E3 & DS3 Mb/s Data Amplifiers

Features

  • Redundant pair operation.
  • Protection switching facility.
  • External alarms from each module.
  • One output bypass on power loss.
  • Compatible with other IRT Eurocard modules and frame

General

IRT produces a range of data distribution amplifiers that operate at the E3 (34.368Mb/s) & DS3 (44.736Mb/s) rates in accordance with G.703. All incorporate a protection switching facility for the switching in of signals from a standby module when a fault is detected.
To facilitate this mode of operation, the ZDA-4300RH provides all of the required signal and logic interconnections between two modules.
The individual module alarms are also provided for remote monitoring purposes.
Three switched outputs are provided at the rear of the module with an additional output for monitoring purposes on each front panel. The primary output is controlled by relays to provide a bypass signal from the input during a power failure.

An Alarm Indication Signal (AIS) detected in the data stream generates a changeover request for a companion unit. In addition, the module may be forced into bypass mode by an external signal.
Changeover-inhibit and changeover-request switches are provided on the front panel for local manual control

 

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