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PRACTICE 553-2201-183
GROUNDBUTTON
OPERATION
(5)
The off-hook condition is detected by the line circuit and the lamp
control removes the -150 V from the tip and ring of the
telephone. The message waiting lamp is deactivated.
(6) Telephone goes on-hook.
(7) The on-hook condition is detected by the line circuit,, the lamp
control places -150 V on the tip and ring of the telephone and
restores the message waiting lamp to the lit state.
5.11 Message Waiting Lamp Cancellation from Telephone.
(1)
Telephone originates a call to the message center.
(2) The off-hook condition is detected by the message waiting line
circuit and the lamps at the telephone and at the lamp bank are
deactivated.
(3) The message center answers.
(4) The CE signals the line circuit and the message lamp control
cancels the message waiting condition.
(5) Telephone goes on-hook.
(6) Message waiting lamp remains unlit.
5.12 Message Waiting Lamp Cancellation from Message Center.
(1)
The CE receives a signal from the message center to cancel the
message waiting condition.
(2) The message waiting line circuit receives the signal from the CE
and the message waiting lamp control removes the -150 V from
the tip and ring of the telephone and the -48 V from the lamp
bank.
--
(3) The lamp is deactivated and the message waiting condition is
cancelled.
5.13 Ground Button Depressed While on an Established Call:
(1)
Ground button detector on the QPC532 sends a ‘ground detected
signal to the scan and signal distributor.
(2)
T:;zSD
encodes a signal and sends it to the central processing unit
(3) The CPU provides a special tone to the party that depressed the
ground button and places the other party on hold.
Page 5-4
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