NatComm PA2 User manual

PA2
PAGING SWITCH
For Technical Assistance
Please Phone: [phone]

Page 2 National Communications
PACKING LIST
Your Model PA2 Paging Switch is supplied as a complete kit, ready for
quick and easy installation by the user.
Description Qty
PA2 Paging Switch 1
12V PowerAdaptor 1
Telephone Line Cord, fitted with a male plug 1
ACMA approved Line Isolation Unit 1

National Communications Page 3
OPERATION
Our Model PA2 Paging Switch is designed to connect to an analogue
extension of a PABX type telephone system.
It can also be connected direct to an analogue PSTN telephone line, for
special applications such as telephone exchange based PABX solutions.
Once installed, PA2 provides you with the capability to make a Paging
Call from any extension of your PABX, as follows :
1. DIAL AN EXTENSION NUMBER
To make a paging call, the user need only dial the telephone extension
number that PA2 is connected to.
2. MAKE YOUR ANNOUNCEMENT
PA2 will automatically answer the incoming call after 2 rings and then
connect the caller to the attached paging amplifier. The caller can then
make a paging announcement and hang up.
3. HANG UP
PA2 has a ‘hang up tone’ detection circuit which will then terminate the
call after the detection of 3Australian specification hang up tones. PA2
will then be ready to take another paging call.
IMPORTANT NOTE
PA2 is calibrated to detectAustralian Specification Hang Up tones. If your
PABX telephone system has not been set to outputAustralian Specification
Hang Up tones when a call is terminated, then you should change it to do
so.
If your PABX telephone system cannot outputAustralian Specification Hang
Up tones, then PA2 can terminate a call after any one of the following
conditions takes place :
1) By pressing any TOUCH TONE digit after the announcement.
2)After a fixed period of time (set by the user).
3)After detection of a period of silence (set by the user).
See pages 6-7 for full details.

Page 4 National Communications
INSTALLATION
Refer to the Installation Diagram on Page 5.
1. Unplug all equipment from theAnalogue telephone extension
socket to be used.
2. Connect the TELEPHONE EXTENSION port of PA2 Switch to the
Analogue telephone service, using the supplied cable fitted with a
male plug.
3. Locate the supplied Line Isolation Unit (LIU) and connect the
SYSTEM port of the LIU to the PA SYSTEM port of the PA2
Switch, using the supplied RJ to RJ telephone line cable.
4. Connect the SOURCE end of your LIU to the Line In or Auxiliary
Input of theAmplifier, using the appropriate suppliedAudio cable.
One cable has a 3.5mmAudio plug while the otherr has an RCA
Audio plug.
Refer to the Installation Diagram on Page 5.
Refer to the section LINE ISOLATION UNIT on Page 8.
5. Connect the supplied 12V power adaptor to the PA2 SWITCH and
switch the power ON.
6. Switch your Amplifier ON, place a paging call to the PA2 switch
and adjust your PA volume to suit.
7. Hang Up.
Note : If PA2 does not terminate the paging call soon after you
have hung up, then your Telephone System is not outputing
Australian specification Hang Up tones and you should program it
to do so (see page 6), or use one of the other call termination
methods described (see page 7).
8. User Programming of PA2 Switch parameters.
Four separate User Programmable parameters are provided.
In most cases you will not need to program PA2 .Refer to pages
6-11.

National Communications Page 5
INSTALLATION DIAGRAM

Page 6 National Communications
HANG UP TONE DETECTION
PA2 incorporates a HANG UP TONE DETECTOR which is designed to
detect ‘Australian’ specification hang up tones, that will normally be present
at the completion of a Paging call. This process is fully automatic.
When PA2 is installed on a PABX system, the Hang Up tone generated
may be outside of the cadence and frequency normally used inAustralia for
Hang Up tones.
In this situation, PA2 may not hang up until the Maximum Paging Call Time
has elapsed (see section 4, page 7), or after a period of silence (see section
3, page 7). Our Hang Up detector, looks for :
1. AToneFrequencybetween300Hzand600Hz.
2. A ToneDurationbetween300mSand600mS.
3. A 50% Duty Cycle +/- 20%
(ie ON and OFF periods should be the same +/- 20%)
You should adjust your PABX system to generate Hang Up tones as per
the above specification, or to output normalAustralian Hang Up tones.
OR
You should use one or more of the other Call Termination methods described
on page 7.
ELECTRO MAGNETIC INTERFERENCE
Electromagnetic Interference (EMI) from some Switch Mode Power Supplies
and some low end UPS units (Uninterruptable Power Supplies) can prevent
hang up tones being detected by PA2.
Switch Mode Power Supplies are easily identified because they do not use
a transformer and are very light.
TURN OFF any SWITCH MODE POWER SUPPLIES located near PA2
(and its power adaptor) and test if the problem is resolved. If the problem is
resolved you should move the offending Switch Mode Power Supply away
from PA2 (and its power adaptor) to a distance that overcomes the problem.
If the PA2 power adaptor is connected to an Uninterruptable Power Supply,
remove it and test if the problem is resolved.

National Communications Page 7
CALL TERMINATION OPTIONS
A paging call be terminated in any one of 4 ways :
1. UPON DETECTION OF HANG UP TONES
PA2 is pre-programmed to automatically HANG UP the paging call after
the detection of 3Australian Specification Hang Up tones.
Important Note : PA2 is calibrated to look for Australian specification
Hang Up tones (see page 6).
You can change the detection parameters or disable this facility (refer
pages 9-11).
2. BY THE CALLER PRESSING ANY TOUCH TONE
The person making the Paging Call can terminate the paging call by
pressing ANYTouch Tone number or digit on their telephone keypad at
the completion of their announcement.
3. UPON DETECTION OF SILENCE
PA2 is pre-programmed to automatically HANG UP the call after the
detection of 10 seconds of silence.
This is because some telephone systems (and some telephone lines
used with virtual PABX solutions) may not output hang up tones at all.
You can change the detection parameters or disable this facility (refer
pages 9-11).
4. AFTER A FIXED PERIOD OF TIME
PA2 will automatically terminate a paging call after a programmable
length of time. The default connection time for PA2 is : 30 seconds.
This is a handy back up in case any of the above methods fails to take
place.
The default time can be set from 1 second to 99 hours (see page 9-11).

Page 8 National Communications
LINE ISOLATION TRANSFORMER
PA2 is supplied with a High Quality Line Isolation Unit (LIU).
Do not attempt to connect any equipment to the PA SYSTEM port of
this unit without using the supplied Line Isolation Unit (LIU), or an
alternativeACMA approved Line Isolation Unit (LIU).
This device is designed to only operate when an LIU is connected.
PA2 will not answer or provide an audio connection, unless the LIU
input is connected to the two centre pins.
The SYSTEM port of the LIU has a modular (RJ11 6 pin) connector
which must connect to the PA SYSTEM Port of PA2 Switch, using the
supplied RJ11 to RJ11 cable.
The SOURCE port of the LIU has a modular (RJ 4 pin) connector which
should connect to the PublicAddress device, using one of the supplied
Audio Cables. One Audio cable has an RCAAudio plug and the other
has a 3.5mm Audio plug.
Do not use an alternative LIU unless you are advised to do so by National
Communications.
Use of an LIU is an ACMA SAFETY REQUIREMENT.
PA2 will not operate unless an LIU is connected to it.

National Communications Page 9
PROGRAMMING OPTIONS
PA2 Switch provides for FOUR separate User Programmable settings
(as detailed below), should they be needed. In most cases you will not
need to program PA2, as the default settings are likely to be suitable
for typical sites.
THE NUMBER OF RINGS BEFORE PA2 ANSWERS
You can set the number of rings before PA2 will answer incoming
calls and switch to the Paging Amplifier :
Allowable Range : 01 to 19 rings
Default Setting is : 2 rings
THE FIXED TIME DURATION OF A PAGING CALL
You can set a fixed CALL TIME in seconds (minutes or hours) that
will take place before PA2 will HANG UP.
Allowable Range : 01 to 99
Default Setting is : 30seconds
You can also change the Allowable Range from 01-99 seconds to
either : 01-99 minutes or 01-99 hours (see page 11, section B)
HANG UP TONE PARAMETERS
You can Disable or Delay Hang Up tone detection.
Set 00 if you wish to DISABLE Hang Up Tone detection
Set 01-99 to DELAY the start of Hang Up Tone detection for 01-99
seconds after the paging call is answered.
Allowable Range : 01 to 99
Default Setting is : 10seconds
SILENCE DETECTION PARAMETERS
You can Disable or Set up Silence Detection.
Set 00 if you wish to DISABLE Silence detection
Set 01-99 to set the time of silence (secs) that will cause hang up.
Allowable Range : 01 to 99
Default Setting is : 10seconds

Page10 National Communications
PROGRAMMING PROCEDURE
In most cases you will not need to program PA2, as the default settings
are likely to be suitable for typical sites.
Should you need to program PA2, please follow the procedure below :
1. TURN OFF POWER TO YOUR PA2 UNIT
2. DISCONNECT THE LIU FROM PA2 SWITCH
PA2 will not program with the LIU connected.
3. CONNECT A STANDARD ANALOGUE TELEPHONE
(or a telephone buttinski) to the Programming port of PA2
4. TURN ON POWER TO YOUR PA2 UNIT
5. PA2 WILL OUTPUT 3 SHORT ‘BEEPS’
Do not proceed until you have heard 3 short beeps.
If you do not hear 3 beeps, return to the start (1).
6. ENTER THE REQUIRED SETTINGS :
As specified in sections A to D on page 11.
Note - You can change one or more settings in any order.
Note - You will hear a single ‘beep’ after each correct entry.
TO EXIT PROGRAMMING MODE - HANG UP.
ALL ENTRIESARE SAVED IN PERMANENT MEMORY.