SPU4 System card/unit
Used for remote extensions to be able to use DTMF. SPU4 communicates with the LIM-processor either with a 128 kbits/s asynchronous or a 2048 kbits/s synchronous communication protocol.
Used for remote extensions to be able to use DTMF. SPU4 communicates with the LIM-processor either with a 128 kbits/s asynchronous or a 2048 kbits/s synchronous communication protocol.
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