NatComm MODEM SWITCH User Manual

MODEM SWITCH

USER GUIDE

For Technical Assistance

Please Phone: [phone]

Page 2 National Communications

PRODUCT DESCRIPTION

MODEM SWITCH is a sophisticated Line Sharing device which is
designed to allow you to connect a Dial Up MODEM to ANY existing
Voice, Fax, Commander/PABX or other Multi-Line telephone system.

It provides you with the ultimate in flexibility, in order to meet a wide
range of customer applications. This device is designed to operate on an
ordinary single telephone line, or even with a PABX/Commander or other
Multi Line telephone system.

It provides you with a choice of THREE completely different methods of
automatically receive incoming MODEM calls on an existing voice or fax
line.

DETECTION OF INCOMING MODEM CALLING TONES (1300Hz)

DETECTION OF INCOMING DTMF TONES FROM SENDING MODEM

FAXSTREAM DUET OPERATION

You can receive incoming MODEM calls using any combination of the
above methods, at any time.

For Outgoing calls, an EXCLUSION FACILITY is provided to ensure that
the attached MODEM device cannot ‘Barge-In’ on a telephone call or fax
call. Similarly, a telephone or fax call cannot ‘Barge-In’ on a MODEM
transmission. If the telephone or fax line is already in use when the
MODEM device attempts to initiate a call, it will be blocked from the line
and will not be allowed access to the line until the line is free.

Your MODEM SWITCH has also been designed for quick and easy USER
INSTALLATION direct to ANY TELEPHONE SOCKET, which will take
you just a few minutes (excluding PABX/Commander applications).

PABX/COMMANDER applications will require professional installation.

Please review this user guide thoroughly, select the operating mode
which best suits your requirements and then follow carefully the appropriate
operating and installation procedure.

OPERATION

OUTGOING CALLS (SENDING)

Devices connected to either port of MODEM SWITCH can make an
outgoing call (SEND) whenever required, providing the other device is not
already using the line. To make an outgoing call (SEND) from either
device, simply initiate your transmission as normal. There are no special
codes required. MODEM SWITCH will automatically detect that the
device has gone ‘off-hook’ to dial, and will connect it immediately to the
telephone line.

RECEIVING CALLS

MODEM SWITCH distinguishes incoming Modem Calls from other
incoming calls by answering all incoming calls first (answers in 2 rings),
and then listening for a short period of time for the presence of a Modem
Calling Tone (1300Hz CNG tone), or a specific DTMF command.

If a Modem calling tone is detected, MODEM SWITCH will RING the
attached Modem device and then connect the incoming Modem call.

If a specific DTMF tone is detected (DTMF 3), MODEM SWITCH will
RING the attached Modem device and then connect the incoming Modem
call.
If a Modem calling tone or DTMF tone IS NOT CONNECTED, MODEM
SWITCH will realise that the incoming call is not a Modem call and will
RING the OTHER attached device(s) so that they can answer the call.

If the OTHER DEVICE is a Fax Machine, it will answer the call and
connect to receive the incoming fax transmission.

If the OTHER DEVICE is a Telephone, Multiple Telephones or a PABX/
Commander or other Multi Line telephone system, then MODEM SWITCH
will ring these devices until the call is answered,or up to 20 times.

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Page 4 National Communications

INSTALLATION PROCEDURE

For connection to a FAX LINE

(refer to the Installation Diagram on page 5)

1.Unplug all equipment from the telephone socket to be used.

2 REMOVE the telephone line cord fitted to your FAX MACHINE (unplug

it from the modular connection on the fax machine).

3.Using the cable you have just removed, CONNECT the modular end of
this cable to the TELEPHONE LINE IN PORT of the MODEM SWITCH.
CONNECT the other end with the Telstra format male plug to your
telephone line socket.

4.Using one of the supplied Modular - Modular line cords, CONNECT the
LINE PORT of the FAX DEVICE to the TELEPHONE LINE OUT PORT
of MODEM SWITCH.

5.Using the other supplied Modular - Modular line cord, CONNECT the
LINE PORT of the MODEM DEVICE to the MODEM DEVICE PORT of
MODEM SWITCH.

6.CONNECT the supplied Power Supply and switch it ON.

7.SET your MODEM DEVICE to it's AUTOMATIC RECEIVE MODE.
Then SET your MODEM DEVICE to ANSWER on the FEWEST RINGS
possible. If Fax/Phone/Modem switching settings are provided on
your Modem Device, ensure that they are all DISABLED. Your
MODEM should be set to answer MODEM-DATA calls only.

8. READ THIS USER GUIDE thoroughly to obtain a full understanding of
the operation of this device.

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INSTALLATION DIAGRAM

Page 6 National Communications

INSTALLATION PROCEDURE

For connection to a VOICE LINE

(refer to the Installation Diagram on page 7)

1.Unplug all equipment from the telephone socket to be used.

2 REMOVE the telephone line cords fitted to your TELEPHONE (unplug

it from the modular connection on the telephone).

3.Using the cable you have just removed, CONNECT the modular end of
this cable to the TELEPHONE LINE IN PORT of the MODEM SWITCH.
CONNECT the other end with the Telstra format male plug to your
telephone line socket.

4.Using one of the supplied Modular - Modular line cords, CONNECT the
TELEPHONE to the PRIMARY DEVICE PORT of MODEM SWITCH.
If you have more than 1 telephone or telephone devices on this line,
they should ALL be connected to the TELEPHONE LINE OUT PORT
of MODEM SWITCH. This procedure will likely require rewiring of your
telephone by a suitably qualified telephone technician.

5.Using the other supplied Modular - Modular line cord, CONNECT the
LINE PORT of the MODEM DEVICE to the MODEM DEVICE PORT of
MODEM SWITCH.

6.CONNECT the supplied Power Supply and switch it ON.

7.SET your MODEM DEVICE to it's AUTOMATIC RECEIVE MODE.
Then SET your MODEM DEVICE to ANSWER on the FEWEST RINGS
possible. If Fax/Phone/Modem switching settings are provided on
your Modem Device, ensure that they are all DISABLED. Your
MODEM should be set to answer MODEM-DATA calls only.

8. READ THIS USER GUIDE thoroughly to obtain a full understanding of
the operation of this device.

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INSTALLATION DIAGRAM

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INSTALLATION PROCEDURE

For connection to a PABX LINE

or other Multi-Line System

1. MODEM SWITCH can be fitted to one specific line of a Commander

or PABX type system. This must be done by a suitably qualified
telephone technician. In this situation :

The incoming telephone line, prior to the system controller should
be connected to the TELEPHONE LINE IN port of MODEM SWITCH.

The PRIMARY DEVICE port should be connected to the system
controller.

The TELEPHONE LINE OUT PORT of the MODEM DEVICE should
then be connected to the MODEM DEVICE PORT of MODEM
SWITCH.

Once fitted, the system will operate exactly as described previously ,
for operation on the selected line.

2.CONNECT the supplied Power Supply and switch it ON.

3.SET your MODEM DEVICE to it's AUTOMATIC RECEIVE MODE.
Then SET your MODEM DEVICE to ANSWER on the FEWEST RINGS
possible. If Fax/Phone/Modem switching settings are provided on
your Modem Device, ensure that they are all DISABLED. Your
MODEM should be set to answer MODEM-DATA calls only.

4. READ THIS USER GUIDE thoroughly to obtain a full understanding of
the operation of this device.

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REQUIREMENTS FOR THE

CALLING MODEM DEVICE(S)

MODEM SWITCH distinguishes incoming Modem Calls from other
incoming calls by answering all incoming calls first (answers in 2 rings),
and then listening for a short period of time for the presence of a Modem
Calling Tone (1300Hz CNG tone), or a specific DTMF command.

Modem devices generate a 1300Hz Calling Tone when dialing out to
another site. This calling tone is designed to allow the remote site to
immediately recognise that the incoming call is from a Modem.

Most Modem devices generate this 1300Hz Calling Tone as a default
condition. However, some Modems may have this facility DISABLED. It
will be necessary for this Modem device to have Calling Tones ENABLED.
This is usually done in the Sending Menu of the dialing software.

For experienced Modem users, you may wish to use a shortcut command
to ENABLE Calling Tones. This shortcut involves entering a ^ symbol
anywhere in the dialing string command, or initialisation string command
for the Modem. Some Modem devices will also generate the 1300Hz
Calling Tone when you to enter a ^ at the end of the phone number. The
alternative is to add additional DTMF digits to the number to be dialled,
as per the details on the next page (DTMF Access Mode), to advise to
the remote site that the call is to connect to a Modem.

A very small number of early model Modem devices CANNOT be set to
generate the 1300Hz Calling Tone. In this situation, these Modem
devices will need to send additional DTMF digits to the number to be
dialled , as per the details on the next page (DTMF Access Mode), in
order to advise to the remote site that the call is to connect to a Modem.

Page 10 National Communications

DTMF ACCESS MODE

Some calling Modem devices may have the 1300Hz Calling Tone
disabled, or it may not be available. In these situations, the remote
Modem user should add a sequence of extra digits to the end of the
telephone number that the MODEM SWITCH is calling.

For example :
If the Telephone Number to be dialed is : [phone]
Your Modem Number will be : [phone],,3,3,3,3,3,3

This extended number can be entered into the callers phone book, just
like any other Modem number and then automatically recalled and
dialled when required. It is a once only setting. These extra digits
instruct the calling Modem to DIAL a series of DTMF 3 commands, after
the normal number has been dialled.

Each (,) represents a pause time of 2 seconds. This sequence will
ensure that the (3) command is sent at regular intervals after dialling for
a period of up to 14 seconds.

By doing so, at least one 3 command will be detected by MODEM
SWITCH after the line has been answered, to instruct the MODEM
SWITCH to redirect the incoming Modem call to the attached Modem.

ADVANCED USER INFORMATION - The number of '3''s transmitted can
be increased or decreased to suit, but they should be transmitted for a
sufficient period of time to ensure that they extend up to or beyond the
time at which the MODEM SWITCH will answer the call. Alternatively the
pause time of each (,) can be increased beyond 2 seconds (up to a
maximum of 4 seconds) by changing the settings of the S8 register of the
sending Modem.

Once the first (3) has been detected by MODEM SWITCH, it will wait until
all subsequent (3) commands are complete, before ringing the attached
Modem. This precaution will ensure that the (3) commands transmitted
do not interfere with the Modem handshake process.

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F AXSTREAM DUET MODE

Your MODEM SWITCH has been preprogrammed to operate with the
Telstra FaxStream Duet Service.

You do not need to do anything other than fit your modem Device to the
MODEM DEVICE port of MODEM SWITCH and have the service
connected.

The FaxStream Duet service will allow a new additional telephone
number to be allocated to the telephone line to which MODEM SWITCH
is fitted, specifically for use as your MODEM NUMBER.

Then whenever this new MODEM NUMBER is then called, your telephone
exchange will send a different ring down your telephone line.

The FaxStream Duet ring pattern will be AUTOMATICALLY detected by
MODEM SWITCH during the first incoming ring.

MODEM SWITCH will immediately answer this call and then connect the
incoming modem call to your Modem device.

This service is available to nearly all customers that are connected to a
Modern Telephone Exchange, at a cost of $6.00 per month (incl GST).

For further details on the connection of this new service, please call
Telstra on 132000

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DIP SWITCH OPTIONS

MODEM SWITCH is a sophisticated Line Sharing device which is designed
to provide you with the ultimate in flexibility, in order to meet a wide range
of customer applications.

Four Dip Switches are located on the underside of the device, which allow
you to individually configure your MODEM SWITCH solution.

The function of each Dip Switch is described in detail on the following pages
in this Manual. A summary of the switch functions are detailed below :

Dip Switch 1 should always be set to the OFF position, unless you are
advised otherwise by National Communications.

Dip Switch 1 if set to ON, selects PASSIVE MODEM SWITCH operation

Dip Switch 1 if set to OFF, sets default MODEM SWITCH OPERATION

Dip Switch 2 is used whenever your Modem Device will not Dial Out.
See page 14 for further detail.

Dip Switch 2 if set to ON, overcomes Modem Dial Out problem.

Dip Switch 2 if set to OFF, sets default MODEM SWITCH OPERATION

Dip Switch 3 is used when you are using the Telstra CND/CLI service
(page 13), or if you have a telephone that will not dial out (page 15).

Dip Switch 3 if set to ON, allows CND/CLI or non dialling phones.

Dip Switch 3 if set to OFF, sets default MODEM SWITCH OPERATION

Dip Switch 4 should always be set to the OFF position, unless you are
advised otherwise by National Communications.

Dip Switch 4 if set to ON, Modem Device will Answer any call after 8 rings

Dip Switch 4 if set to OFF, sets default MODEM SWITCH OPERATION

Note - You must REMOVE POWER from MODEM SWITCH and then reconnect it again

to ensure that new Dip Switch changes are read.

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CALLING NUMBER DISPLAY

Calling Number Display (CND), also known as Calling Line Identification
(CLI) is an optional Telstra service where a callers telephone number is
sent from the telephone exchange to a special CND/CLI reading device
on your telephone line.

The callers phone number (unless the caller elects not to send this
information) is sent as a modem type transmission of information before
the first full telephone ring on your line.

MODEM SWITCH in its default configuration, is programmed to NOT
PASS this first full ring, as it analyses this ring as part of its MODEM
detection process. This means that in its default configuration, CND/CLI
information will NOT pass through to your CND/CLI reading device.

If you plan to use the Telstra Calling Number Display service and a CND
a CND/CLI reading device, then you should set Dip Switch 3 to the ON
position.

DIP SWITCH SETTINGS

If you wish to set MODEM SWITCH

to operate with the Telstra CND service,

please set :

Dip Switch 3 to the ON position.

.

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TROUBLE SHOOTING

MODEM DEVICE WILL NOT DIAL

MODEM SWITCH in its default configuration, is programmed to remove
your MODEM DEVICE from the telephone line and only connect your
Modem Device to the telephone line when you are sending or receiving
a Modem Transmission.

By doing so, MODEM SWITCH can ENSURE that your MODEM DEVICE
will NEVER INTERFERE with incoming or outgoing telephone calls.

However, a small number of Modem Devices will NOT DIAL when
connected to MODEM SWITCH in this way. If your Modem Device WILL
NOT DIAL out, then you should set Dip Switch 2 to the ON position.

DIP SWITCH SETTINGS

If your Modem Device will NOT DIAL OUT

when connected to MODEM SWITCH,

please set :

Dip Switch 2 to the ON position.

When Dip Switch 2 is set to the ON position, MODEM SWITCH will leave
your Modem Device connected to your telephone line when your line is
not in use and will then remove it from the telephone line whenever you
pick up a telephone to make an outgoing call or whenever you receive an
incoming call.

NOTE - When Dip Switch 2 is set to the ON position, you MUST set to
your MODEM DEVICE to answer on TWO or MORE RINGS. This will
ensure that your Modem Device does not interfere with incoming telephone
calls. Providing you do so, this setting will not interfere with your Line
Sharing requirements.

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TROUBLE SHOOTING

TELEPHONE DEVICE WILL NOT DIAL

MODEM SWITCH is programmed to remove your TELEPHONES from the
telephone line and only connect your TELEPHONES to the incoming
telephone line whenever you pick up a telephone handset to dial out or
after it has answered an incoming call, to determine if the incoming call
is not a Modem call.

By doing so, MODEM SWITCH can ENSURE that your TELEPHONES
Do Not Ring when you are receiving an incoming Modem call.

However, a small number of TELEPHONES will NOT DIAL OUT when
connected to MODEM SWITCH in this way. If you have a Telephone that
WILL NOT CALL out, then you should set Dip Switch 3 to the ON
position.

DIP SWITCH SETTINGS

If you have a Telephone that WILL NOT DIAL out,

when connected to MODEM SWITCH,

please set :

Dip Switch 3 to the ON position.

When Dip Switch 3 is set to the ON position, MODEM SWITCH will leave
your Telephones connected to your telephone line when your line is not
in use so that they can dial out. However by doing so, you will hear 1
full ring for all incoming calls before MODEM SWITCH will ANSWER the
call and then process the call as a Voice or Modem call.

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SPECIFICATIONS

Dimensions(all in mm) : 106 (W) x 106 (D) x 43 (H)
Weight : 225g
Power Supply : 12VAC/500mA
Power Consumption : Idle - 0.5 Watts
Power Consumption : Call - 0.75 Watts
Line In Connector : RJ 1 1 6 pin (2 centre)
Line Out Connector : RJ 1 1 6 pin (2 centre)
Fax Machine Connector : RJ 1 1 6 pin (2 centre)
Power Connector : 2.5mm barrel connector
ACMA COMPLIANT : Supplier Number N 782

WARRANTY

This device is guaranteed against defects from workmanship for a period
of two years (24 months) from the date of purchase. In the event of
failure, you should return the product, along with proof of purchase date,
and a written statement about the nature of the problem.

The obligation is solely to repair or replace the product. The warrantor
is not liable for any incidental or consequential damages due to such
defects.

This Warranty shall not apply to any unit which has been subject to
alteration, modification, abuse, negligence, accident, external voltage/
lightning surge or used in any manner contrary to these instructions.

The user is responsible for freight costs to the repair point. The warrantor
will be responsible for freight costs in returning this unit back to the
user.

Damage caused to this device or attached equipment, by lightning strikes
or over voltage surge is not covered under this warranty.

CASE SEALED AT FACTORY

OPENING THE CASE VOIDS THE WARRANTY