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1SS 4, SECTION
501-165-102
equipment completes the connections and rings
the called
party,
the last digit of a small
number
should be programmed
later
in the
call cycle, ie, the 10th position.
3.15
To check installation
of dial in the restricted
mode.
(No manual
dialing
permitted. )
(1) Remove handset from the associated telephone
set.
Dial tone should be present.
(2) Actuate
call
buttons,
telephone
numbers
programmed
on associated
relays
should
automatically
be dialed.
4.o4
When the telephone
set ringer is connected
for some reason (such as testing),
refer to
Table C for wiring connections
required
to prevent
relay K8 from operating
on ringing
current.
4.o5
$If a call is abandoned by placing the handset
on-hook after the dialing sequence has been
started,
but has not been completed,
the dialer
will continue
to:
(a) Dial the programmed
number.
(b) Proceed through
all unused positions.
(c) Step to the talk position
and wait.
(3) Replace telephone
handset
on hook.
(4)
Verify that dial tone cannot be broken when
the handset
is off-hook and the line switch
is manipulated.
3.16
To check installation
of dial in the unrestricted
mode.
(d) After
a delay of 600 to 700 milliseconds,
the dialer
will step to the home position.
In the event that a stop is wired into the dialer
and the call is abandoned
before
the stop is
reached, the internal
timer will restart
the dial
and the preceding
events will occur.4
B.
Unrestricted
Mode
(1) Repeat paragraph
3.15 (1) through
(3).
(2) Verify that
dial tone can be broken
when
the handset
is off-hook and the line switch
or manual
dial button
is operated.
4.
OPERATION
A.
Restricted Mode
4.o1
The dial responds
to an off-hook condition
of the associated
telephone
set, steps
off
Home
position, seizes the preset line, and isolates
the telephone
set transmitter
from the line.
This
prohibits manual dialing and voice transmission
from
the telephone
set.
4.02
Operating
the call button operates and locks
the
KTU(S).
The programmed
telephone
number
is dialed and the dial steps to the
Talk
position
reconnecting
the transmitter
to the line.
4.o3
After
completion
of a call, going on-hook
causes the dial to step to the
Home
position
and releases
the KTU(S) terminating
the call.
K
In the restricted mode it is not possible
!
to receive
calls
at the associated
telephone set; therefore
the telephone
set
ringer
should
be silenced.
4.06
This mode permits
both automatic
(preset)
and
normal
dialing
from
the
associated
telephone
set.
Even if the preset dial is disabled,
ie, loss of ac power, the station
can still manually
dial.
See Table C for required
wiring connections.
4.o7
If the dial is started
by a switch contact
closure
(call button)
it will seize the line,
dial the preset number,
and return
the line to the
associated
telephone
set.
5.
CONNECTION
INDEX
Table C–43B
and 53B Dial Options
Fig. 4—Examples
of Programming
Three
Numbers
on 43B Dial, Single Line and
Single
Station
Use, Restricted
Mode,
Connections
Fig. 5—Examples
of
Programming
Three
Numbers
on 53B Dial, Single Line and
Single
Station
Use, Restricted
Mode,
Connections
Fig. 6–Typical
Connections
for 229B KTU'S
Using 227B KTU as Slave Relay
Fig. 7–229B
Key Telephone
Unit
Page
5
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