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    Homepage > Bilder > Sonstige Telefonanlagen
    Panel Decoder frame  32 von 105eine Seite zurückeine Seite vor

    Panel Decoder frame
    Panel Decoder clearly showing route wiring and relay cabinets

    This is a photo of a typical Panel Decoder. Top right of the photo you can see the isle alarm lights (White, Green and Red) for this Decoder. On the right you can see the wiring for the different routes. To the left are the cabinets that contained all the relay logic. Behind the Decoder you can see a typical rolling ladder found in Central Offices.


    Panel Decoder Test Frame and trouble indicator panel

    The purpose of the Panel Decoder Test Frame was to run routine tests on each Decoder. This was generally done during light traffic because the Decoder under test was not available for regular call processing.

    The purpose of the trouble indicator panel was to display via lamps the status of the failed Decoder operation. A minor alarm would also sound. If other errors occured they were lost until the trouble indicator panel was reset as it had no memory.

    If a Decoder actually failed its internal relay logic checks either during setup connection to a Sender or during release of the Sender a local "very loud" gong would start ringing activating aisle pilot indicator lamps.

    Since a reasonable sized Panel office only had three Decoders during peak traffic you could not afford to have one out of service.

    Bildquelle: Public Domain


    Panel Decoder frame  32 von 105eine Seite zurückeine Seite vor
    Homepage > Bilder > Sonstige Telefonanlagen