SECTION 512-630-111
(2) If the customer desires to continue using
his present key set, use of a KS-19252Ll
bridging adapter is recommended. A surface-mounted
625C connecting block can be connected to a
153C adapter, which is then plugged into the
bridging adapter.
(3) If a 66-type connecting block is available,
the 625C connecting block can be wired
directly to it. Refer to appropriate section in
Division 461 for connection information on 66-type
connecting block and 153-type adapter.
3.08
When 4-wire operation is required, remove
the rear housing assembly and with a
screwdriver rotate selector switch to the 4W position
(Fig. 6).
The transmit line should be connected
to the T and R leads from the control unit and
the receive line should be connected to the Tl
and Rl leads.
4.
OPERATION
A. Rotary Dial Service-220A Hand Telephone Set
4.01
The hand telephone set is used to establish
all outgoing calls. Incoming calls may be
answered using the hand telephone set or by
depressing the SET MIKE ON button. Dial lamp
power is provided when the power is connected.
B.
TOUCH-TONE Service
4.02
A 2220B TOUCH-TONE handset can be
substituted for the 220A handset for
TOUCH-TONE dialing and signaling with no
modifications other than the lamp change noted in
paragraph 5.03.
C.
Hands-Free Operation
4.03
The conference is transferred from the
handset to hands-free operation by depressing
one of the five locking key buttons (SET MIKE
ON, GOLD MIKE, GREEN MIKE, AUX DIAL, or
MIKES OFF) and then returning the handset to
its cradle.
4.04
A call is transferred to the handset mode
and the control unit is deactivated whenever
the handset is lifted.
4.05
Incoming calls are heard through the set
loudspeaker.
The output level is adjusted
Page 4
by means of the VOLUME control. Advance the
VOLUME control only far enough for adequate
listening level. However, when this control is set
at 0, a lecturer speaking into the conference set
will be heard more clearly at the remote location
since the set will remain in the transmit mode.
SET MIKE ON
4.06
When the SET MIKE ON key button is
depressed, the control unit microphone is
activated.
The person talking should position
himself in front of the unit, preferably at a distance
of one or two feet for best transmission.
GOLD MIKE, GREEN MIKE
4.07
To use remote microphones, plugs should
be inserted into the labeled jacks located on
the rear of the control unit. The microphones will
be activated when the gold or green key button
is depressed.
Note:
A n y combination of the three
microphones can be used at one time by
simultaneously depressing the appropriate
buttons.
4.08
The remote microphones can be hand-held,
inserted in a desk stand, or used as a
lavaliere (Fig. 5). A talking distance of one foot
is recommended.
MIKES OFF
4.09
When this key button is depressed all
microphones are disconnected from the circuit,
leaving the conference set in the receive mode
only.
AUX DIAL
4.10
If TOUCH-TONE service is available, two
means of signaling to a computer terminal
are possible.
(a) The customer can be provided with a 2220B
TOUCH-TONE handset in place of the 220A
handset (see paragraph 5.03 for lamp change).
Tone signaling may be accomplished by using
the handset dial. The AUX DIAL key button
need not be depressed.
BSP
S12-630-111·i02_1979-05-04.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Feb 16, 2012 23:01:02
