Home > ASI / SDI / STM-1 Path Protection & Distribution Amplifier Type DDA-4320

ASI / SDI / STM-1 Path Protection & Distribution Amplifier Type DDA-4320

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article image Path Protection & Distribution Amplifiers

The DDA-4320 path protection and distribution amplifiers, From IRT Electronics  cover a wide range of distribution and monitoring functions for ASI, SDI or STM-1 signals.

Six outputs are provided at the rear of the module and one on the front panel for monitoring purposes. The rear assembly includes a bypass relay to switch the Input to Output 6 in the event of a power failure.

The DDA-4320 path protection and distribution amplifiers incorporate a protection facility for switching five of the outputs between signals from a companion DDA-4320 when a loss of input is detected. For this configuration, a special double width rear assembly (type ZDA 4320RH) is required to link the signal and logic sections of the two modules.

Changeover-inhibit and changeover-request switches are provided on the front panel for use where modules are so linked.

A manual changeover request may be made either locally by using the front panel switch, remotely via a connection on the rear assembly, or via Simple Network Management Protocol (SNMP) when installed in an IRT frame fitted with SNMP capability.

Features of the DDA-4320 path protection and distribution amplifier: 

  • Optional plug-in SNMP monitoring and control module 
  • For use as buffer or distribution amplifier 
  • Six in-phase re-clocked outputs 
  • Protection switching capability 
  • Selectable for either ASI / SDI or STM-1 applications 
  • Relay bypass on loss of power 
  • Front panel indicators provide monitoring of presence of input signal at 270 Mb/s (ASI/SDI) or 155 Mb/s (STM-1) 
  • Automatic input equalisation to 250 m 
  • Automatic output muting on no input

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