Telephone Connections (Oxygen 3 And 3 St) - Axel Oxygen 3 Operating Manual

TELEPHONE CONNECTIONS (OXYGEN 3 and 3 ST)

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Jumper setting LINE / PHONO on the INPUT B / Channel 4,5 & 6 Stereo input board (Oxygen 3 ST)
6 TELEPHONE CONNECTIONS (OXYGEN 3 and 3 ST)
The Telephone module features a built-in telephone hybrid.
The audio sent to the telephone caller is a mix-minus (N-1). The mix minus signal is the programme output
signal with the phone signal (caller's voice) removed.
Connections:
LINE: RJ11 socket for telephone line connection
NOTE: Oxygen 3 and 3 ST hybrids operate on standard POTS (Plain Old Telephone Service) / PSTN
(Public Switched Telephone Network) analog telephone lines. Automatic line compensation is featured.
TEL / PHONE socket: allows the connection on parallel of a external telephone set (f.i. for dialling services).
Please note that this socket is always active (i.e. it doesn't depend on the 'Hook' button).
The two RJ11 connectors will accept 4 conductor modular plugs, but only the 2 central conductors (typically
Red & Green ) are used.
R/L (OUT REC on PIN RCA): double mono output which allows recording of the telephone calls (either
SEND or RECEIVE signals).
CALL (terminal board connector): connector for external call signalling. A photocoupler inside the module
closes when a telephone call comes (ring).
NOTE: Typical current allowed on the photocoupler: 5 mA (max 10 mA). Max voltage allowed: 15 V.
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