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V-9924B
COMMON AUDIBLE RINGING UNIT
GENERAL
The Common Audible Ringing Unit provides an
audible signal over the paging system when there is
an incoming call. It is used between a telephone
system and the public address system.
SPECIFICATIONS
Activation
• 1A2 Bell/Buzzer ICM
• PABX Station Port
• Electronic Key System Station Port
• Contact Closure
Issue 6
Features
• Activates via ringing voltage, buzzer voltage or
contact closure
• Capable of switching signal to three zones
simultaneously
• Uses standard 1A2 key system voltages
• Each zone is equipped with a 5 Watt amplifier
and volume control
• Contains a punchdown block as part of the unit
• Compact size, can be mounted on wall or in
cabinet
• Automatically switches paging speakers from
paging system to audible signal of the V-9924B
during the ring interval of the incoming call
• Variable pitch control
• Two auxiliary contact closures
Other Materials Required
• -24VDC power supply
• Cat 3 or 5 twisted pair telephone cable
• Mounting screws and hardware
Dimensions/Weight
• 8.20" H x 4.55" W x 2.30" D
(20.83cm H x 11.56cm W x 5.84cm D)
• 1.3 lbs. (.59kg)
Power Requirements
The V-9924B requires a -24VDC "B" battery and
draws 50mA idle and 300mA maximum operating.
Signal Requirements
The V-9924B requires interrupted ringing or buzzer
voltage or dry contact closure to operate. The output
of the V-9924B will follow the interruptions of the
input. The ringing voltage should be approximately
105VAC and the current requirement would be 8mA.
The buzzer voltage should be approximately 18VAC
and the current requirement would be 10mA. The
V-9924B pulls approximately 3mA through a dry
contact closure for activation. Ringing and buzzer
voltages cannot be applied simultaneously. Use only
one method of activation.
1 947924
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To Key
System
Common
Audible
To UNA or Ring
Dry Closure
Power
Supply
Aux Relay
Contacts
Aux Relay
Contacts
SIG COMMON
18VAC SIG
105VAC SIG
CC
CC
GROUND
-24VDC BATT
AUX 1 NO
AUX 1 COM
AUX 1 NC
AUX 2 NO
AUX 2 COM
AUX 2 NC
FIGURE 1 - SIMPLIFIED BLOCK DIAGRAM
11
12
13
7
22
14
15
25
23
24
10
8
9
ZONE 1 IN - TIP
16
ZONE 1 IN - RING
17
ZONE 1 OUT - TIP
1
ZONE 1 OUT - RING
2
ZONE 2 IN - TIP
18
ZONE 2 IN - RING
19
ZONE 2 OUT - TIP
3
ZONE 2 OUT - RING
4
ZONE 3 IN -TIP
20
ZONE 3 IN - RING
21
ZONE 3 OUT - TIP
5
ZONE 3 OUT - RING
6
From Page Unit
Speakers for Zone
From Page Unit
Speakers for Zone
From Page Unit
Speakers for Zone
INSTALLATION
Precautions
Failure to observe the following precautions could
result in damage to the V-9924B and other
equipment.
a. Unplug the power supply when connecting the
power leads and signal leads to the unit. These
leads are brought in on adjacent terminals.
Accidental bridging of these two terminals could
damage the equipment.
b. Use pared crossconnect wire for all voice
connections and voltages.
c. Set all volume controls to their minimum
(Counter clockwise) level.
Mounting
Remove the metal mounting plate from the rear of
the V-9924B enclosure. Using two #6 ¾" wood
screws, mount the plate in a vacant space on the
backboard with the telephone system common
equipment. Both mounting holes must be utilized to
insure secure mounting of the unit. See Figure 1A.
Open the V-9924B enclosure to access connections
and option switches. Slide the rear of the unit
(Contains the board) onto the mounting plate and
lock in place with screw provided. Make
connections.
Signaling Connections
The V-9924B can be activated via ringing voltage,
buzzer voltage or a dry contact closure. When used
with buzzer voltage, apply one side of the pair to SIG
COMMON (Pin 11 or 26) and the other side of the
pair to 18VAC SIG (Pin 12 or 27). For ringing
voltage connections, put one side of the pair on SIG
COMMON (Pin 11 or 26) and the other side of the
pair to 105VAC SIG (Pin 13 or 28). The V-9924B
can also be activated by connecting one side of a dry
contact closure to pin 7 and the other side of the dry
closure to pin 22.
Speaker Connections
The V-9924B Common Audible Ringing Unit is
capable of switching up to three zones of speakers to
the audible signal generated by the unit. The device
is intended to be placed in series with the speakers.
Zone 1 IN (Pins 16 and 17) are connected to the
speaker/zone output leads of the page control. Zone
1 OUT (Pins 1 and 2) are connected to the speakers.
Zones 2 and 3 hook up in a similar fashion. Refer to
Figure 3 for pin numbers.
Power Connections
Connect -24VDC from the power supply to pin 15 or
30 on the crossconnect block and ground to pin 14 or
29.
Contact Closure
Two form C auxiliary contact closures are provided
on the V-9924B. These contacts follow the input
cadence and may be used for special applications.
The contact ratings are 1 Amp at 24VDC.
Set Up
After all connections are complete and double
checked, apply voltage to the unit. Place a call to the
telephone system and while ringing or buzzer is
being applied to the unit or when the dry contact
closure closes, adjust the volume of each zone by
turning the volume control clockwise for each zone.
Replace cover when all connections and adjustments
are complete and lock in place using the #6 ½"
screws provided.
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TO REMOVE COVER
A
LOOSEN SCREW,
THEN AC TIVATE L ATCH
PLASTIC
COVER
WIREWAY OPENING
TO WALL PLATE AND
JUNCTION BOX
CIRCUIT BOARD
HOUSING ASSEMBLY
SNAP LATCH
FIGURE
METAL WALL
MOUNTING
PLATE
BRACKET
LOCKING
SCREW
WIRE TIE LOOP
WIRE TIE USED TO BUNDLE WIRES
ENTERING AND LEAVING TERMINAL AREA
.155 DIA. HOLES FOR MOUNTING TO
SING LE OR D OUB LE GANG JUNC TION B OX
HOLE PATTERN MATCHES BOTH EURO
AND US JUNCTION BOXES
1.5 x 2 WIRE ACCESS OPENING
TO JUNC TION BOX
SNAP LATCH
FOR COVER
OPERATION
Figure 4 shows a V-9924B simplified schematic.
When the V-9924B is idle, 1T IN is shorted to 1T
OUT, 1R IN is shorted to 1R OUT, 2T IN is shorted
to 2T OUT, 2R IN is shorted to 2R OUT, 3T IN is
shorted to 3T OUT, and 3R IN is shorted to 3R OUT.
A signal appearing at the T IN, R IN terminals will
also appear at the T OUT, R OUT terminals for each
zone.
Signaling
When ringing or buzzer voltage appears at the
signaling input leads of the V-9924B, or UNA
closure pins are connected, relays are energized and
the 1T OUT, 1R OUT, 2T OUT, 2R OUT, 3T OUT,
and 3R OUT leads are switched to the outputs of
three 5 Watt amplifiers (One for each zone). At the
same time, the electronic warble tone is connected to
the input of each of the amplifiers and the warble
signal (Will follow the interrupted ringing pattern) is
broadcast to all of the speakers. Each zone has its
own volume control so the volume can be set to a
comfortable level.
Pitch Control
A pitch control has been provided to vary the pitch of
the warble ring tone should a different pitch be
desired. Generally, this control does not require
adjustment (See Figure 2).
TECHNICAL ASSISTANCE
When trouble is reported, verify power is being
supplied to the unit, buzzer, ringing voltage or
contact closure appears at the unit and that there are
no broken connections at the punchdown block. To
effectively test the unit, a VOM and a lineman's test
set will be required. Use the VOM to check for
voltage from the power supply and to verify that
buzzer or ringing is coming from the telephone
system. The lineman's test set can be used to check
for the warble tones on the T OUT and R OUT leads
to the speaker. If a spare unit is available, continue
to troubleshoot by substituting a spare unit for the
suspected unit.
Assistance in troubleshooting is available from the
factory. When calling, you should have a VOM, a
telephone test set available and call from the job site.
Call (540) 563-2000 and Press 1 for
Technical Support, or visit our website at
http://www.valcom.com.
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The V-9924B is not field repairable. Valcom
equipment contains no user serviceable parts
inside. Valcom, Inc. maintains service facilities in
Roanoke, VA. Should repairs be necessary, attach a
tag to the unit clearly stating your company name,
address, phone number, contact person and the nature
of the problem. Send the unit to:
Valcom, Inc.
Repair and Return Dept.
5614 Hollins Road
Roanoke, VA 24019-5056
R24
Pitch
Contro
15
30
N
N
O
G
I
G
I
S
D
C
D
V
4
2
-
N
U
O
R
G
S
C
C
A
A
V
5
V
0
8
1
1
M
M
O
C
G
I
S
.
O
.
N
2
X
U
A
O
M
.
M
C
O
.
C
N
2
2
X
X
U
U
A
A
Zone 1
Zone 2
Zone 3
1
16
E
R
T
U
U
S
O
O
3
L
E
C
N
A
O
N
Z
U
T
U
O
2
E
N
O
Z
T
U
O
1
E
N
O
Z
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
D
C
D
V
4
2
-
G
G
I
N
U
O
R
G
I
S
S
C
C
A
A
V
V
5
8
0
1
1
CROSSCONNECT BLOCK LAYOUT
N
O
M
M
O
C
G
I
S
.
.
N
C
O
.
.
N
1
X
U
A
O
N
M
1
M
X
O
U
C
A
1
X
U
A
FIGURE 3
E
N
R
I
U
3
S
E
O
N
L
C
O
Z
A
N
U
N
I
2
E
N
O
Z
4
N
I
1
E
N
O
Z
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RINGING OR
A
A
A
A
A
A
BUZZER
COMMON
BUZZER
RINGING
UNA OR RING
DRY CLOSURE
PITCH
POW ER
SUPPLY
CROSSCONNECT BLOCK
GND
-24VDC
"B BATT"
PIN NUMBERS ON
11,26
12,27
13,28
14,29
15,30
22
7
C1
.22mf
R1
RING
DETECTION
TONE
GENERATION
-24VDC
R8
VOLUME
ZONE 1
R12
VOLUME
ZONE 2
R16
VOLUME
ZONE 3
K3
K2
K1
K3
K2
K1
16
17
1
2
18
19
3
4
20
21
5
6
25
23
24
10
8
ZONE 1
1T IN
1R IN
1T OUT
1R OUT
ZONE 2
2T IN
2R IN
2T OUT
2R OUT
ZONE 3
3T IN
3R IN
3T OUT
3R OUT
UX 1 NO
UX 1 COM
UX 1 NC
UX 2 NO
UX 2 COM
UX 2 NC 9
FIGURE 4 - SIMPLIFIED SCHEMATIC
Valcom, Inc. warrants its products to be free from defects in materials and workmanship under conditions of normal use and service
for a period of one year from the date of shipment. The obligation under this warranty shall be limited to the replacement, repair or
refund of any such defective device within the warranty period, provided that:
1. inspection by Valcom, Inc. indicates the validity of the claim;
2. the defect is not the result of damage, misuse, or negligence after the original shipment;
3. the product has not been altered in any way or repaired by others and that factory sealed units are unopened (a service
charge plus parts and labor will be applied to units defaced or physically damaged);
4. freight charges for the return of products to Valcom are prepaid;
5. all units ‘out of warranty’ are subject to a service charge. The service charge will cover minor repairs (major repairs will
be subject to additional charges for parts and labor).
This warranty is in lieu of and excludes all other warranties, expressed or implied and in no event shall Valcom, Inc. be
liable for any anticipated profits, consequential damages, loss of time or other losses incurred by the buyer in connection
with the purchase, operation, or use of the product.
This warranty specifically excludes damage incurred in shipment. In the event a product is received in damaged condition, the
carrier should be notified immediately. Claims for such damage should be filed with the carrier involved in accordance with the
F.O.B. point.
Headquarters: In Canada
Valcom, Inc. CMX Corporation
5614 Hollins Road 35 Van Kirk Drive #11 and 12
Roanoke, VA 24019-5056 Brampton, Ontario L7A 1A5
Phone: (540) 563-2000 Phone: (905) 456-1072
FAX: (540) 362-9800 FAX: (905) 456-2269
VALCOM LIMITED WARRANTY
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