Valcom V-9923B User manual

Issue 5
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V-9923B
CODE CALL UNIT
INTRODUCTION
The V-9923B Code Call Unit provides two or
three digit code call paging via a loop start trunk
port on a PABX or by the use of a spare line
button on a key system.
The V-9923B complies with Part 68 of the FCC
Rules and Regulations and has been granted
FCC Registration #BAFUSA-68753-KX-N.
The ringer equivalence is 0.1B and the unit
requires a USOC RJ21X connector.
In accordance with FCC Rules and applicable
tariffs, this code call unit may only be installed
with the authorization of the owner of the host
system.
The FCC Registration #BAFUSA-68753-KX-N
will be listed in the affidavits filed with the
telephone company; it will also be recorded in
the system log kept by installation and
maintenance personnel. The local telephone
company is to be notified of the FCC registration
number when this code call unit is installed.
SPECIFICATIONS
The V-9923B is capable of providing code
signaling for paging purposes; it provides for
"meet me" answer of code call and provides talk
circuit and signaling tone.
Features
•Trunk level access on PABX's, station level
answer
•Can be used with 1A2 type key systems
•81 two digit codes or 729 three digit codes
•Uses rotary or tone dial signaling
•Dial tone to calling party
•Coded tone output for paging systems
•Switch controlled code verification tone
•Automatically discontinues code sending
when answered
•Capable of being used with another V-9923B
to provide two link operation
•Uses standard 1A2 key system voltages
•Mounts on the wall, in a key cabinet, or in
the PABX Cabinet
Capacity
Each V-9923B Code Call Unit provides the
necessary equipment for 1 link of Code Call.
For an additional link of Code Call, another
V-9923B is required (two links maximum).
Dimensions
7.1"H x 5.9"W x 2.1"D
(18.03cm H x 14.99cm W x 5.33cm D)
Power Requirements
Valcom V-9923B requires –24VDC talk battery
and –24VDC signal battery. Below shows
current consumption and voltage range:
"A" Battery:
Range: –21.5 to –26VDC
Idle: 0mA
Operating: 65mA
"B" Battery:
Range: –21.5 to –26VDC
Idle: 75mA
Operating: 125mA

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Nominal Timing and Frequency
Specifications
The timing and frequency specifications of the
Valcom V-9923B Code Call Unit are shown in
Table 1. Figure 1 is a timing chart showing the
nominal timing of a code call.
Table 1
Dial Tone Frequency 180Hz
Coded Tone Frequency 550Hz
Time Tones Broadcast 370ms
Time between tones in a sequence 500ms
Time between digits in a sequence 1.5 sec
Time between series of digits 8 sec
The Valcom V-9923B will detect 20-30Hz ringing
on the answer port. The applied ringing voltage
should be 75 to 125VAC.
DESIGN
The V-9923B provides two or three digit code
call paging via a loop start trunk port on a PABX
or by the use of a spare line button on a key
system. Figure 2 is a simplified block diagram
showing the code call unit and its connections.
NOTE: The code call unit is designed so that
it will complete a code call sequence before
resetting and returning dial tone, even if all
parties hang up.
Application
Key systems and PABX's used in:
•Department stores/shopping centers
•Hospitals, nursing homes
•Noisy locations, manufacturing plants
•Schools, universities
Additional Materials Required
Additional equipment is required to complete a
system when using the V-9923B. These items
are:
•-24VDC power supply (if existing supply
inadequate or non-existent)
•66 type connecting block
•25 pair cable with a female amphenol
connector on one end
•twisted pair cross connect wire
TONE ON
TONE OFF
.37 sec.
.50 sec.
1.5 sec. 1.5 sec. 8 sec.
"3" "1" "2" "3" "1"
SEQUENCE
BEGINS
SEQUENCE
BEGINS
AGAIN
CONTINUES UNTIL
A
NSWERED OR
CALLING PARTY
GOES ON HOOK
FIGURE 1

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INSTALLATION
Precautions
All precautions have been taken at the factory to
insure that the equipment functions properly
when installed correctly. Please follow the
precautions listed below before applying power
to the equipment or the equipment may be
damaged and the warranty voided.
a) If power was previously connected,
disconnect or remove power before
inserting or removing unit from the
amphenol connector.
b) Exercise caution when cross connecting
wires that two adjacent terminals are not
bridged together.
c) Double check all connections before
applying power.
d) Use twisted pair wire for all connections.
Mounting
The Valcom V-9923B Code Call Unit may be
mounted in a key cabinet relay rack or on the
wall near the distribution frame. When choosing
a location, it is necessary that the loop
resistance of the PABX, or key system are not
exceeded.
Mount the unit in a vacant space in an
equipment cabinet, rack, or key system cabinet,
allowing enough room at the rear of the unit to
plug in an amphenol connector. Mount a 66B
type punch down block near the unit and label it
per Figure 3.
Run a 25 pair cable with a female connector
from the unit to the connecting block. The cable
should be terminated on the connecting block in
standard color code order on a row of the
connecting block. Verify all connections before
plugging the amphenol end of the cable into the
V-9923B Code Call Unit.
Connections to PABX
The connections required to connect the
V-9923B to a PABX is shown in Figure 4.
The V-9923B requires a loop start trunk port
from the PABX for access. If more than one link
of code call is being provided, the second
V-9923B would require a trunk also and the two
trunks should be in a hunt group within the
PABX. This arrangement allows access to the
second V-9923B if the first V-9923B is in use.
NOTE: Advise personnel using code call unit
to always wait for dial tone from code call
unit before dialing in code number!
To answer the code call requires a station from
the PABX. If two code call units are being used,
two stations would be required and they would
have to be in a rotary hunt group also.
Connections to Key Systems
The connections required to connect the
V-9923B to a 1A2 key system is shown in Figure
5. The T, R, A and L leads are multiplied to all
phones in the system. Use a spare pick-up
button and install a 10K Ohm 1/4 watt 5%
resistor either in the phone or at the connecting
block in series with the A lead from each phone.
The V-9923B will discontinue the code call
paging when it recognizes two phones off hook
with two 10K Ohm resistors to ground on the A
leads.
NOTE: When using 1A2 key telephones, the
TO and RO leads that were used for PABX
connection are not used.
A
CCESS
PORT
A
NSWER
PORT
V
-9923B
CODE CALL
TO
RO
TT
RT
IN
OUT
T
RX
ANALOG
PBX
STATION
CIRCUIT
TONE OUTPUT
TO PAGING
SYSTEM
SWITCHED
RELAY
OUTPUT
EP1 EP2AB AG BB BG LS
Y
TO –24 Vdc AND
10 Vac POW ER
SUPPLIES
TO NEXT V-9923B
CODE CALL UNIT
IF EQUIPPED
INH
L
Y
X
Y
Y
PBX
OUTGOING LOOP
START CO TRUNK
10K
SPARE LINE BUTTON
ON KEY TELEPHONE
USED WITH PBX
USED WITH 1A2 KEY SYSTEM
FIGURE 2

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Power Connections
The connections required to connect the
V-9923B to a power supply are shown in
Figure 6. Correct polarity must be observed for
the unit to function properly.
Output Connections
The V-9923B contains a tone generator and
isolation transformer to allow direct hook-up to
the paging system amplifier. The tones are
applied to the output in the coded sequence
dialed into the unit. The tones appear on the TT,
(BK/S, pin 29) and the RT (S/BK, pin 30) leads.
If tones are not required as in the case of using
Claxton horns, bells, buzzers, lamps, etc. a
contact closure is available. The contact is
capable of handling 1 amp @ 125VAC or 2
amps @ 30VDC. Higher current requirements
should use the contact to operate a power relay,
which would switch the load. The switched
make contact input is the IN lead (BL/BK, pin 22)
and the out lead is the OUT lead (BK/BL, pin 21).
When the switched output of the V-9923B is
used to operate a DC slave relay, it is necessary
to install a spike suppression diode in parallel
with the coil of the relay. Refer to Figure 7 for
the appropriate connections.
Option Switches
Four option switches are located through the
back of the unit near the amphenol.
•Switch 1 sets either two or three digit
operation.
•Switch 2 allows or disallows the calling
party to hear the tones as they are sent.
•Switch 3 must be left in the ON position.
•Switch 4 is for flashing or solid lamp
indication on access (1A2 key systems
only).
*Refer to Figure 8 for Option Switch Settings
Two Link Connection
If more than one V-9923B is being used to
provide two link operation, strap EP1 lead from
first unit to EP2 lead of second unit. Strap EP2
lead of first unit to the EP1 lead of the second
unit. A maximum of two links is all that is
possible.
OPERATION
The code call unit is accessed by placing a
telephone or a resistive short across T and R.
The unit will return dial tone to the calling party
when it is ready to accept digits.
NOTE: In two link operation, dial tone will be
withheld from the second link until the code
call on first link is answered to prevent two
codes being broadcast simultaneously.
The calling party then dials in a two or three digit
number depending upon the position of dipswitch
#1 on the code call unit. After the last digit the
code call unit begins to transmit tone via the TT
and RT leads and the contact on the IN and OUT
leads closes in conjunction with the tones. The
unit continues to broadcast the codes until it is
released by the calling party going on hook or by
someone answering the code call.
When the unit is being used by a PABX, the
ringing voltage on the TO and RO leads from the
PABX station releases the code call unit and
connects the PABX trunk (access) to the PABX
station (answer).
If the unit is being used with 1A2 key telephones,
when the second party goes off hook on the
code call button, the combined voltage drop
across the 10K Ohm resistors in the A leads
releases the code call unit.
The code call unit is designed so that it will finish
broadcasting a code before returning dial tone
and resetting even if answered in the middle of
the code call sequence.
Figure 9 is a simplified schematic illustrating the
main control functions contained in the V-9923B.
TECHNICAL ASSISTANCE
When trouble is reported, verify power is being
supplied to the unit and there are no broken
connections. Be sure the amphenol is secure in
the back of the unit and the cable is terminated
correctly on the cross connect block. Check
voltages for proper polarity on cross connect
block. If a spare unit is available, continue to
troubleshoot by substituting the spare unit for the
suspected defective unit.
Assistance in troubleshooting is available from
the factory. Call [phone] and press 1 for
Technical Support, or visit our website at
http://www.valcom.com.
Valcom equipment is not field repairable.
Valcom, Inc. maintains service facilities in
Roanoke, VA. Should repairs be necessary,
attach a tag to the unit clearly stating 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

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TABLE 2
TROUBLESHOOTING CHART
PROBLEMS PROBABLE CAUSES AND SOLUTIONS
No dial tone
No tone output
Unit doesn't answer
Unit cuts off on answer
Verify power connections; check operation of unit by placing test
telephone across the T and R leads and going off hook. If dial tone
present, check wiring to key system or PABX. If no dial tone, check
wiring of EP leads to other units. Verify that all grounds are common.
Verify polarity of power connections. Replace unit.
Remove leads on the TT and RT leads on cross connect block. Place
call into the unit and verify with a telephone across TT and RT leads
that tones are being broadcast. Listen to unit to hear relay operating
during code.
Verify ringing voltage appearing across the TO and RO leads if using
PABX or that A lead is dropping below half of supply voltage if using
key telephone.
Reverse station leads on TO and RO.
VALCOM LIMITED WARRANTY
Valcom, Inc. warrants its products only to the original purchaser, for its own use, 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. This Limited Warranty obligation 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 Limited 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,
maintenance, installation, removal or use of the product. The maximum liability of Valcom under this warranty is limited to the purchase price of the
specific Product covered by the warranty.
Disclaimer. Except for the Limited Warranty provided herein, the product is provided “as-is” without any warranty of any kind whatsoever including, without
limitation, any WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.
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:
Valcom, Inc.
5614 Hollins Road Roanoke, VA 24019-5056
Phone: [phone] FAX: [phone]

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19
45
20
46
21
47
22
48
23
49
24
50
25
W/BL
BL/W
W/O
O/W
W/G
G/W
W/BR
BR/W
W/S
S/W
R/BL
BL/R
R/O
O/R
R/G
G/R
R/BR
BR/R
R/S
S/R
BK/BL
BL/BK
BK/O
O/BK
BK/G
G/BK
BK/BR
BR/BK
BK/S
S/BK
Y/BL
BL/Y
Y/O
O/Y
Y/G
G/Y
Y/BR
BR/Y
Y/S
S/Y
V/BL
1
2
3
4
5
BL/V
V/O
O/V
V/G
G/V
V/BR
BR/V
V/S
S/V
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
T
R
L
LS
INH
TO
RO
OUT
IN
PC
TT
RT
EP1
EP2
A
G
A
B
BG
BB
ABC DE F
PBX AND
KEY SYSTEM
INPUT
A
NALOG PBX
A
NSWER PORT
SWITCHED
RELAY
OUTPUT
TONE
OUTPUT
EXPANSION
CIRCUIT
POWER
SUPPLY
66B350
FIGURE 3
CB-1

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PART OF PBX
LOOP START
OUTGOING C.O.
TRUNK
(ROTARY OR T.T.)
PBX ANALOG
STATION PORT
T
R
T
R
T
R
TO
RO
W/BL (1)
BL/W (2)
W/BR (7)
BR/W (8)
FIGURE 4
CONNECTIONS OF V-9923B TO PABX
T
R
W/BL (1)
BL/W (2)
PART OF CONNECTING
BLOCK ROW B
INH
L
G/W (6)
W/O (3)
O/W (4)
LS
TO 10 Vac ON
POWER SUPPLY
T
R
A
L
LG
P.U.
10K
N
E
T
TO REST OF
KEY STRIP
A
1
H.S.
PART OF KEY TELEPHONE
INSTRUMENT
FIGURE 5
CONNECTION OF V-9923B TO KEY SYSTEM
V-9923B
LS
IN
O/W (4)
BL/BK (22)
A
G
A
B
V/BR (47)
BR/V (48)
V/S (49)
BG
V-9923B
S/V (50)
BB
10 Vac
LG
A
G GROUND
A
B -24 Vdc
BG GROUND
BB -24 Vdc
NOTE 1
NOTE 2
NOTES:
1. LS CONNECTED TO 10 Vac ONLY WHEN
USING KEY TELEPHONE.
2. IF SWITCHING OUTPUT IS BEING USED
INSTEAD OF TONE OUTPUT, STRAP IN
LEAD TO OUTPUT TO BE SWITCHED.
IF TONE OUTPUT IS USED, IN LEAD
HAS NO CONNECTIONS.
PART OF CONNECTING
BLOCK - ROW B
FIGURE 6
POWER SUPPLY CONNECTIONS

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BK/BL
BL/BK
Diode 1N4003 or eq.
(Portion of
Connecting
Block)
DC Power Supply
depends on relay
requirements
Relay Coil
FIGURE 7
CONNECTIONS OF V-9923B FOR
OPERATING A DC SLAVE RELAY
THREE DIGIT
OPERATION
TWO DIGIT
OPERATION
NO CODE
VERIFICATION
CODE
VERIFICATION
MUST BE IN THE ON POSITION
SOLID
LAMP
FLASHING
LAMP
SW OFF ON
1
2
3
4
2 DIGIT CODES: 11-19, 21-29, ., 91-99
3 DIGIT CODES: 111-119, 121-129,
...., 991-999
OFF ON
FIGURE 8
OPTION SWITCH SETTINGS
LINE
SUPERVISION
BATTERY
FEED
RING
DETECTOR
K2
TONE OR ROTARY
PULSE DECODING
OSC. AND
A
MPLIFIER
LOGIC AND
MEMORY
K1
TT
40
RT
15
OUT
36
IN
11
TONE
OUTPUT
SW ITCHED
RELAY
OUTPUT
K1
K3
TO ANALOG
STATION OF
PBX (ANSWER)
TO
29
RO
4
T
26
R
1
K2
K2
TO PBX TRUNK OR
SPARE LINE BUTTON
ON TELEPHONE
(ACCESS)
K4
LS
INHIBIT
CIRCUIT
CONTROL
CIRCUIT
EP1
2
L
27
INH
3
LAMP SUPPLY
LAMP ON LINE BUT.
"A" LEAD OF LINE BUT. 47
EP2
22
TO NEXT
V-9923B
K3
VOLT
REG.
A
GND.
A
BATT.
B GND.
B BATT.
FIGURE 9
V
-9923B SIMPLIFIED SCHEMATIC
K1
OUT
IN