Clarity STPA User manual

1
CSP - STPA
Issue 3
[phone]
STPA
TELEPHONE PAGE ADAPTER
INTRODUCTION
The STPA is a Telephone Page Adapter used to interface
Clarity mixer-amplifiers to Centrex lines, C. O. lines and
PABX stataion numbers. This instruction contains the
specifications and guidelines necessary to install, operate,
and maintain the STPA which is manufactured by Clarity,
1111 Industry Avenue, Roanoke, VA 24013.
This paging unit has received FCC type KX registration.
This Registration Number 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 and Ringer Equivalence
Number. FCC Registration Number: BAF9I7-13957-
OT-N; Ringer Equivalence Number: 1.1A. The STPA
connects to the telephone line by means of a standard jack
called the USOC RJ11C.
In accordance with FCC Rules with application tariffs,
the Page Adapter may only be installed with the
authorization of the owner of the host system.
DESIGN
General
The Clarity STPA Expandable Station Level Page
Adapter is designed to provide access to paging from a
standard PABX station number, a Centrex number, or a
Central Office line. The unit is directly connected to
Clarity mixer-amplifiers. Multiple Telephone Page
Adapters with mixer-amplifiers may be used to provide
multizone paging.
PABX Station Level Paging
NOTE: Before proposing Station Level Paging for your
PABX perform the following test:
1. Dial between two stations on the PABX and
answer the call.
2. Have the called party listen after the calling
party hangs up.
3. After calling party release, what does the called
party hear?
If the PABX IMMEDIATELY returns any type of tones
to the called party (dial tone, reorder tone, etc.) then
STATION LEVEL PAGING CAN NOT BE USED.
Consult your Clarity catalog for an appropriate trunk
level page adapter. If there is a delay of at least 10
SECONDS before any tones are returned, then one-way
paging may be used but talkback paging will be
impossible. If the line REMAINS SILENT after
disconnect, then one-way or talkback paging may be
used.
If the type of paging you desire is possible on a station
level of your PABX, then continue in this section to
determine the equipment required.
1. One Zone of One-Way Paging
This arrangement will require one PABX
station number, one STPA page adapter,
appropriate Clarity mixer-amplifier, and
speaker assemblies.
2. Multi-Zone One-Way Paging with All Call
This arrangement will require a PABX station
number and STPA for each zone, and an
additional number and STPA for All Call.
Centrex or C. O. Line Access to Paging
1. One Zone of One-Way Paging
One zone of one-way paging will require one
Centrex or C. O. Line, a STPA, and the
appropriate speakers.
2. Multi-Zone One-Way Paging with All Call
This arrangement will require a PABX station
number and STPA for each zone, and an
additional number and STPA for all call.
947421
SPECIFICATIONS
Applications

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-Loop start central office lines
-PABX station numbers
-Centrex numbers
Refer to Figure 1 for a block diagram of a typical PABX
installation.
Features
- Ring trip on first ring
- 600 ohm output; 8 ohm output with AGC
- Multiple units may be used for multi-zone paging with
all call behind a PABX
- Music input
- Open loop detect
- Audio sensing circuit for reset
- Time out reset
- Manual reset
- Answer verification tone
- All call override tone
- Battery reversal indicator
- Auxiliary form C contacts
- Built-in connecting lock
- Powered by a receptacle mount power supply (included)
Limitations
When used with a PABX, the PABX must not return any
tones to the called party after calling party disconnect on
a station to station call.
Capacity
- Each STPA, when connected to its own PABX station
number, will provide one zone of paging.
- Use a STPA and a station number per zone for multi-
zone paging behind a PABX.
- An additional station number and STPA may be used to
provide all call or override in a one-way multi-zone
system behind a PABX.
Dimensions
-8.25"H x 4.65"W x 2.25"D
(20.96 cm x 11.81 cm x 5.72 cm)
-1.5 lbs. (.68 Kg)
Nominal Specifications
Tip and Ring Input 600 ohms
Voltage for Ring Trip 75-105VAC, 20 or 30Hz
Ring trip timing 150 ms
Open loop detect 150 ms starting 1 second
after ring trip
Audio sense release 4, 8, 16, 32, or 64
seconds after audio
drops below -22dbm
Time out release 4, 8, 16, 32, or 64 seconds
Manual reset 25 ms ground
Output 1:Impedance 600 ohms
Page level Output level = input level
-1 db
Music level Output level = input level
Output 2:Impedance 8 ohms
Page level -10dbm
Music level -17dbm
Music Source 8 to 600 ohm -10 to -18 dbm
Answer verification tone 500hz, 500 ms
All call override tone 500 hz, 250 ms on,
250 ms off
Form C Contacts 24 VDC, 3.0 amps or
105 VAC, 1.5 amps
Power Requirements
-21.5 to -26 VDC "B" Battery, 200 ma max. (power
supply included)
Environment
Temperature: 0 to 50 Degrees C
Humidity: 0 to 85% non-precipitating
INSTALLATION
Instructions
Each instruction is preceded by a line. Place a check on
the appropriate line as the instruction is completed. The
instructions also include tests along the way to verify
connections have been made correctly. If these steps are
followed properly, installation of the Clarity system will
go smoothly and quickly. If the results of a test do not
correspond with what is shown, Do Not Proceed Until
the Problem has been Corrected.
ALL CALL IN
8 OHM OUT
ALL CALL AUDIO
TIN
R
ZONE 1 IN
ALL CALL IN
8 OHM OUT
ALL CALL AUDIO
TIN
R
ZONE 2 IN
ALL CALL OUT
8 OHM OUT
TIN
R
ALL CALL IN
BLOCK DIAGRAM OF A TYPICAL PABX INSTALLATION
FIGURE 1
ONE-WAY
AMPLIFIED
SPEAKER
ASSEMBLIES

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FIGURE 4 - DIP SWITCH SETTINGS
SW OFF ON
1Audio Sense Time Out Enable
Enable
2Not 1 Sec. 1 Second
3Not 64 Sec. 64 Seconds
4Not 32 Sec. 32 Seconds
5Not 16 Sec. 16 Seconds
6Not 8 Sec. 8 Seconds
7Not 4 Sec. 4 Seconds
8Loop Detect
Disable Loop Detect Enable
POWER CONNECTIONS
NOTE: Power is required for each STPA being used. If
multiple units are being installed, power for additional
units may be multipled from pins 14 and 15 of a
preceding unit (pin 14 is "+" and pin 15 is "-").
__ 1. Connect -24VDC from power supply to pin 30
on STPA.
__ 2. Connect 24VDC Ground "+" from power supply
to pin 29.
__ 3. Connect 24VDC Ground "+" from power supply
to telephone system GROUND.
4. Power test:
__ (a) Plug in power supply
__ (b) If power reversal LED is lit:
__ (1) Unplug power supply
__ (2) Reverse connections on pins 29 and 30
__ (3) Repeat step 4.
__ 5. Unplug power supply
Centrex, C. O. and PABX Connecting
Arrangements
NOTE: Place a check by the arrangement being used and
proceed to the Figure indicated for step-by-step
instructions.
__ 1. One Zone of One-Way Paging: Proceed to
Figure 5.
__ 2. Multi-Zone One-Way Paging with All Call:
Proceed to Figure 6.
WIRING INSTRUCTIONS
Place a check by each step as it is completed.
1630 115
Power
Reversal
Indicator
1 8
ON
OFF Dip Switches
FIGURE 2
LOCATION AND NUMBERING OF
PUNCHDOWN BLOCK AND DIP SWITCHES
Punchdown
Block
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
30 29 2423 2228 27 26 25 21 20 19 18 17 16
FIGURE 3 - PUNCHDOWN BLOCK PINOUTS
AUX GND TERM.
AUX -24VDC OUT TERM
ALL CALL OUT MANUAL RESET 8 OHM PAGE OUT 600 OHM PAGE OUT BREAK
STATIONARY
MAKE
-24VDC IN
GROUND (+) IN
ALL CALL IN
ALL CALL AUDIO IN
MUSIC INPUT
RING IN
TIP IN
12345 6 7 8
ON
OFF

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__ 1. Connect Tip of the PABX, Centrex, or C. O.
Line to pin 16 of the STPA.
__ 2. Connect Ring of the line to pin 17.
__ 3. Connect one side of the Tel Line input on the
mixer-amplifier to STPA pin 8.
__ 4. Connect the other side of the Tel Line input to
pin 9.
__ 5. Dipswitch Settings: If the STPA is being used
with a PABX extension, then switch 1 must be
OFF. Switch 2 is not used. Turn ON one of
switches 3-7 to select the reset timing (the
length of time the unit stays active after last
sensing audio). Switch 8 must be ON. If the
STPA is being accessed from a Centrex or C.
O. Line, then set dipswitches 1 and 8 "ON" and
switches 2-7 "OFF".
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
PABX Station Number,
Centrex Number or
C. O. Line
Music Source
(Optional)
CLARITY
Mixer/Amplifier
B Battery
(-24vdc)
B Ground (+)
Ring Tip
Option switch on Clarity Mixer/Amplifier should be set to Tel Line
Figure 5: One Zone One-Way Paging
Tel Line
Input

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WIRING INSTRUCTIONS:
Place a check by each step as it is completed.
1. Connections for Zone 1:
__ (a) Connect Tip of the PABX station number for
zone one to pin 16 of the STPA being used for
zone one.
__ (b) Connect Ring of the station number to pin
17.
__ 2. Connect one side of the Tel Line input on the
mixer-amplifier to STPA pin 8.
__ 3. Connect the other side of the Tel Line input to
pin 9.
Remember each zone will require it's own station number
and STPA.
__ 4. All Call Connections:
__ (a) Connect Tip of the All Call station number to
pin 16 of the STPA.
__ (b) Connect Ring of the station number to pin 17.
__ (c) Strap from pin 8 of the All Call STPA to pin 25
of each of the STPA's being used for individual
zones.
__ (d) Strap from pin 9 of the all call STPA to pin 26
of each of the STPA's being used for individual
zones.
__ (e) Strap from pin 13 of the all call STPA to pin 28
of each of the STPA's being used for individual
zones.
FIGURE 6
15 14 13 12 11 10 987654321
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Zone 1 Station
Number
Ring
Tip
Clarity
Mixer/
Amplifier
POWER SUPPLY
STPA (Zone 1)
15 14 13 12 11 10 987654321
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
STPA (Zone 3)
Ring
Tip
Clarity
Mixer/
Amplifier
15 14 13 12 11 10 987654321
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
STPA (All Call)
Zone 2 Station
Number
POWER SUPPLY
All Call Station
Number
T
R
-+
24 vdc
Power Supply
T
R
T
R

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__ 5. Dipswitch Settings: If the STPA is being used
with a PABX extension, then switch 1 must be
OFF. Switch 2 is not used. Turn ON one of
switches 3-7 to select the reset timing (the
length of time the unit stays active after last
sensing audio). Switch 8 must be ON. If the
STPA is being accessed from a Centrex or C.
O. Line, then set dipswitches 1 and 8 "ON" and
switches 2-7 "OFF."
OPERATION
The STPA, Station Level Page Adapter, has three inputs:
Tip and Ring from the line, music, and all call; and two
outputs: 8 ohm and 600 ohm.
Any input will provide audio at both the 8 ohm and 600
ohm outputs. Signals coming from the 8 ohm output will
be processed by the automatic gain control circuitry and
a preamplifier. Music on the 8 ohm output will be
maintained 7db below the level of the paging (this is not
user adjustable). There is no modification of page or
music signals when using the 600 ohm output. The 600
ohm output also provides a loop on access and may be
used with loop start paging equipment.
In the idle state, signals from the music input will appear
on both the 8 ohm and 600 ohm outputs. On receipt of
superimposed ring generator on Tip and Ring, the STPA
will be activated and will place a loop across the station
Tip and Ring for ring trip. An answer verification tone
will then be returned to the calling party, and Tip and
Ring audio will be connected to the 8 ohm and 600 ohm
outputs.
After access, the reset circuitry is turned on. If the unit is
set for loop detect, it will ignore any open conditions for
the first second, and then it will release when it senses an
open loop on Tip and Ring lasting at least 150 ms. If you
are using the audio sense reset, the unit will stay on line
until sensing a lack of audio (-22db or less) for the period
set by the dipswitches. If using the time out reset, the unit
will stay on the line for the preset length of time and then
will reset, whether the page is complete or not. On
release, the music source is reconnected to the outputs.
All call, if connected, will override both the music and
page inputs. All call requires an additional station port
for access and must be wired as shown in Figure 4-5.
When the all call station number is dialed any paging in
progress will be overridden and an alert tone will be
returned to the overridden parties. If they remain on the
line, on completion of the all call page, they will be
reconnected to their respective zones and all timers will
be reset, allowing a full page again on each zone.
TECHNICAL ASSISTANCE
When trouble is reported, verify that DC power is being
supplied to the unit. Assistance in troubleshooting is
available from the factory. When calling, you should
have a VOM and a test set available and be calling from
the job site. Call 1-540-427-3505 and ask for an
Applications Engineer.
CLARITY equipment is not field repairable. CLARITY
maintains service facilities in Roanoke, VA. Should
repairs be necessary, please call Clarity at 1-540-427-
3505 for a Return Authorization Number.
LIMITED WARRANTY
Clarity 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 Clarity 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 in any way 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 Clarity 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 Clarity 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.

7
TO REMOVE COVER
LOOSEN SCREW,
THEN ACTIVATE LATCH
PLASTIC
COVER
CIRCUIT BOARD
HOUSING ASSEMBLY
SNAP LATCH
METAL WALL
MOUNTING
PLATE
WIREWAY OPENING
TO WALL PLATE AND
JUNCTION BOX
WIRE TIE LOOP
WIRE TIE USED TO BUNDLE WIRES
ENTERING AND LEAVING TERMINAL AREA
SNAP LATCH
FOR COVER
.155 DIA. HOLES FOR MOUNTING TO
SINGLE OR DOUBLE GANG JUNCTION BOX
HOLE PATTERN MATCHES BOTH EURO
AND US JUNCTION BOXES
1.5 x 2 WIRE ACCESS OPENING
TO JUNCTION BOX
BRACKET
LOCKING
SCREW
FIGURE 7

8
1. Red power reversal LED is lit.
2. Will not trip ringing.
3. No output from amplified speaker
assemblies.
4. Unit will never release.
5. All call does not work
A. Reverse power connections to pins 29 and 30.
A. Verify 24 vdc on pins 29 (+) and 30 (-).
B. Verify ring voltage is present on pins 16 and 17 (75 vac
min.)
A. Listen for audio on 8 ohm output (pins 8 and 9).
B. Verify 24vdc to speakers (GND is +, 24 vdc is -).
A. Refer to the appropriate connection Figure and verity
dipswitches are set properly.
A. Verify connection s according to Figure 6.
B. Verify "all call out" of master unit is connected to "all call
in" of all other units.
C. Verify 8 ohm output of master unit connected to "all call
audio in" of all other units.
D. Verify proper voltage and polarity on pins 29 (+) and 30 (-
) of master unit.
E. Verify ring voltage is present on pins 16 and 17 of master
unit when all call number is dialed.