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SECTION 5 1 8-41 1 - 1 00
Intercom Dial
Time (IDT)
Intercom
Audible
Ringback (IAR)
Intercom Busy
Tone (IBT)
Error
Tone (GT)
Acknowledgment
Tone (AT)
Reminder
Tone (RT)
Override
Tone (OT)
Hold Tone
A.
484A KTU-Station Interface Circuit
The
2 . 1 4
484A
through
18,
being installed. Each KTU contains the circuitry
for four station codes.
station visual and audible signals from signals
received over the H,
Page 4
BSP 518-411-100-i01_1978-08-04.jpg
CALL PROGRESS TONES
TONE
SIGNAL HEARD
128 Hz continuous
256 Hz interrupted;
1 second on, 3
seconds off
128 Hz interrupted
at
1/2-sec intervals
256/512 Hz alternating
at 1/2-sec intervals
128 Hz for 250 ms
128 Hz interrupted at
75 ms intervals for
1-1/4 seconds; then
continuous 128 Hz
128 Hz for 500 ms
Four bursts of 128 Hz
tone.
(HT)
KTUs are installed in j acks
depending on the station codes
The
484A
controls the
and
leads, and also
BL,
A
Scanned by Fra n k Harrell, (Cowboy Frank) Castle Rock, Colorado Oct 15, 2012 20:55:53
TABLE B
If any station is equipped
with a 2A HF AI unit, IAR
consists of a single spurt
(1 second) of 128 Hz time
Tone heard when errors
are made in setting up
dial-activated features.
Indicates procedure must
be restarted.
Tone heard when feature
has been properly activated
or canceled. Also heard on
paging access calls.
Tone heard at start of all
calls, followed by dial tone at
stations that have activated
CFWD, ACBK or DND as a
reminder that feature is in
effect.
Tone heard by both parties
of a conversation when a
station exercising OV ERRIDE
is bridged on line
Tone heard when switchhook
is flashed during a call. Hold
tone is always followed by
steady dial tone.
controls the station busy
Control of the seized intercom link is also through
6
the station circuit.
Note:
Power interruptions greater than 1.7
seconds will release any calls in progress.
Stations that are off-hook when the power is
REMARKS
.station hold features.
and
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