3
947923
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.
ACCESS
PORT
ANSW ER
PORT
V-9923B
CODE CALL
TO
RO
TT
RT
IN
OUT
T
R
X
ANALOG
PBX
STATION
CIRCUIT
TONE OUTPUT
TO PAGING
SYSTEM
SW ITCHED
RELAY
OUTPUT
EP1 EP2
AB 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 W ITH PBX
USED W ITH 1A2 KEY SYSTEM
FIGURE 2
