Справочник Пользователя для AT&T System 85

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Two adapters are available to allow the use of standard headsets with voice terminals connected
to the DEFINITY, System 75 and System 85 switches.  The 500A and the 502A Headset
Adapters are identical in appearance, operation, and function but different in internal circuitry.

The 500A and 502A headset adapters can be used with the DEFINITY G1, G2, G3, System 75,
and System 85.  The 500A adapter can be used with single-line Models 7103A, 7102A, and
7102A Plus and multi-appearance Models 7203H, 7205H, 7403D, 7405D, 7406D, 7406BIS,
7406 Plus, Enhanced 7407D, 7407 Plus, 7410D, 7410 Plus, 7434D, 7444, 8403, 8410, 8434, and
8102 voice terminals/telephones and the 6508, 7505, 7506, 7507, 8503T, 8510T, and 8520T
ISDN terminals.  The 502A adapter is intended for use with multi-appearance Models 7303S and
7305S voice terminals only.

This dual-purpose switch is used to:

d

Turn on the adapter connecting the headset to the voice terminal.  Pressing the On
switch is equivalent to going off-hook with the handset.

d

Disable the transmitter of the headset temporarily for privacy.

Turns off the adapter and disconnects the headset.  Pressing the Off switch is equivalent to
going on-hook with the handset.

Used to connect the double phone plug of the headset.

Indicates when the headset is active.