The DDA-4320 path protection and distribution amplifier covers a wide range of distribution and monitoring functions for ASI, SDI or STM-1 signals.
Four outputs are provided at the rear of the module. The rear assembly includes a bypass relay to switch the Input to Output 6 in the event of a power failure.
The DDA-4320 incorporates a protection facility for switching three 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 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.
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