Alcatel OmniPCX Enterprise R7.1 Manuale di Installazione Scaricare il pdf (Pagina 62)

4.2.1.7.6 Connecting a doorphone

2 doorphone types are available, depending on the operating mode used:

- Type A: relay-controlled doorphones (e.g. NPTT)

- Type B: doorphones controlled by MF Q23 signals requiring an SLI interface (e.g.

TELEMINI and UNIVERSAL DOORPHONE)

The doorphone interface comprises an intercom and an optional latch powered by the mains

supply through a SELV (Safety Extra Low Voltage) transformer.

It is connected via the DOORPHA and DOORPHB outputs (control contacts open when idle)

of the DOORPHONE connector.

Connecting an NPTT doorphone

Chapter

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Alcatel OmniPCX Enterprise R7.1 Manuale di Installazione Pagina 62