buckling into place. Secure the back dust cover into
and the RELEASE pushbutton simultaneously but
position. Set the power on-off switch to the ON
a. A 2600 Hz release tone is heard in the headset
now ready for operation.
for 3 to 10 seconds and then subsides.
b. The SRI is activated for channel 2.
c. The night alarm is activated. Depress the
When the Converter is installed for switchboard
ACCESS pushbutton for channel 2 to clear the
operation, it must be checked for proper operation.
The following procedures should be sufficient to
4.12 Remove the answer cord from channel 2 and
assure the operator that the Converter is operating
reinsert in one of the jacks for channel 3.
4.13 Depress and hold the ACCESS pushbutton for
6.1 Operational Test Line Check
channel 1 and the SEIZE pushbutton. The following
a . Turn the power on-off switch to the ON
events take place:
a. The channel 2 SRI indicates a request-for-
It maybe necessary to depress the ACCESS
b. The night alarm is activated.
pushbutton of each channel to return the
c. A 570 Hz acknowledge tone is heard in the
service request indicators and the night
alarm to normal when power is initially
4.14 Release the ACCESS and SEIZE pushbuttons.
The following events take place:
b. Insert the answer cord from the operators cord
a. The SRI for channel 2 continues to indicate a
circuit (on the manual switchboard) into one of the
channel 1 jacks located on the front panel of the
b. The night alarm remains on.
Converter. (Either jack may be used, as they are
c. The 570 Hz acknowledge tone stops.
wired for parallel operation. )
d . A 425 Hz ring-back tone is heard in the
c. Depress the ACCESS pushbutton for channel 1
4.15 Restore the Converter to the idle state by
Hold both pushbuttons depressed until a 570 Hz
depressing the ACCESS pushbuttons for channels 2
acknowledge signal is heard in the headset. This
indicates the seize signal has been detected by the
a. The SRI returns to normal on all channels.
switching center and a 570 Hz acknowledge signal is
b. The night alarm is off.
being returned to the Converter.
c. No tones are heard in the headset.
d. Release the ACCESS and SEIZE pushbuttons
and listen in the headset for dial tone.
The above test procedures will prove helpful
e. When dial tone is received, depress and hold
as a preliminary checkout. Each step can be
the ACCESS pushbutton. Then depress digit 9 on
performed from a different channel to check
out the various functions of the overall
f. Dial tone should be inhibited by the automatic
Converter as well as the proper operation of
switching center when the first digit 9 is received
each channel. Refer to the maintenance
from the Converter. Listen for the absence of dial
section of this manual if a malfunction oc-
tone. Depress the second and third digit 9
curs during checkout.
sequentially. (Depress each digit key slowly and
for Switchboard Operation
firmly to assure proper operation of the keyswitch.)
Three sets of WF-16/U field wires extending from
g. Listen in the headset for a test tone from the
the automatic switching center to the Converter are
automatic switching center.
connected to the binding posts for the Converter
h . After receiving the test tone, depress the
send and receive pairs of each channel (see Figure 2).
R E L E A S E pushbutton to clear the channel, as
Each set of wires is inserted through the grommet in
the dust cover (dust cover removed). Check to insure
i. Depress the ACCESS pushbutton for channel 1
the power on-off switch is in the OFF position.
and the common RELEASE pushbutton (see Figure
Attach the appropriate pair of wires to each send and
Both pushbuttons should be depressed
receive pair binding posts (located at the back of the
simultaneously and momentarily. A 2600 Hz release
Converter). Stack the Converter on top of the SB-
tone will thus be transmitted from the Converter to
22()/PT or the SB-86()/P and secure by un-
the automatic switching center.
threading the strap (located on the inside of the
j. Listen for the absence of the test tone and for
Converter cover) and running the strap completely
the receipt of a 570 Hz acknowledge tone. Note that
around the two units. Secure the Converter by
the SERVICE REQUEST indicator does not come