NatComm Multiple Modem Switch User Manual

Multiple Modem Switch

USER GUIDE

For Technical Assistance

Please Phone: [phone]

Page 2 National Communications

PACKING LIST

Y our MUL TIPLE MODEM SWITCH is supplied as a complete
kit, ready for quick and easy installation by the user .

Description Qty

MUL TIPLE MODEM SWITCH Line Sharing Unit 1
12V Power supply 1
T elephone Line cord, fitted with a male plug 1
RJ1 1 (6 pin) to RJ1 1 (6 Pin) connection cables 2
User Guide 1

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PRODUCT DESCRIPTION

Our MUL TIPLE MODEM SWITCH devices are designed for applications where
multiple telephone devices, which have Modem facilities, and are required to
RECEIVE INCOMING MODEM CALLS and share the same telephone line.

Up to FOUR MUL TIPLE MODEM SWITCH’s can be fitted to ONE LINE, to
provide for connection of up to 8 separate devices.

Each MULTIPLE MODEM SWITCH will allow TWO devices to be added to it.
In total up to 7 Modems and 1 Fax Machine can share a Fax Telephone Line,

or up to 8 Modems can share one telephone line.
Each MUL TIPLE MODEM SWITCH device provides BARGE-IN PROTECTION,

which will ensure that only one of these telephone devices can have access to
the telephone line at any one time.

SHARING A DEDICATED FAX LINE

Your MUL TIPLE MODEM SWITCH will answer all incoming calls after 2 rings.
If the incoming call is a Fax Call, the internal Fax Switch will then automatically

detect and transfer the incoming Fax to the attached Fax Machine.
Incoming Modem (Data) calls are automatically routed to any 1 of 7 attached

Modems by adding DTMF digit(s), 1 to 7, to the end of the telephone number
(dial string) dialed by the calling Modem.

DTMF 1 will connect the call to Modem 1, DTMF 2 will connect to Modem 2
and so on right through to DTMF 8, which will connect the call to Modem 8.

SHARING A DEDICATED MODEM LINE

Your MUL TIPLE MODEM SWITCH will answer all incoming calls after 2 rings.
Incoming Modem (Data) calls are automatically routed to any 1 of 7 attached

Modems by adding DTMF digit(s), 1 to 7, to the end of the telephone number
(dial string) dialed by the calling Modem.

DTMF 1 will connect the call to Modem 1, DTMF 2 will connect to Modem 2
and so on right through to DTMF 8, which will connect the call to Modem 8.

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OPERATION

Up to FOUR MULTIPLE MODEM SWITCH ES can be fitted to ONE LINE, to
provide for connection of up to 8 separate devices.

ONE MULTIPLE MODEM SWITCH unit (called the MASTER) should be set
to ANSWER incoming calls. All other MULTIPLE MODEM SWITCH units should
have the ANSWER facility disabled.

The ANSWER facility for each unit is set by the position of Dip Switch 2
located on the underside of the unit (see DIP SWITCHES).

Set Switch 2 to ON to ENABLE the answer facility .
Set Switch 2 to OFF to DISABLE the answer facility .

If you are also using a FAX on the same line, it should be connected to the
DEVICE A port of the MASTER unit. Y ou should then set Dip Switch 1 to the
ON position to enable the FaxSwitch function.

When there is an Incoming Call, the MASTER unit will answer the call after 2
Rings. This unit and all other AUTO-SELECT units will then “listen” to the line
for up to 9 SECONDS.

If a FAX TONE (CNG T ONE) is detected, the MASTER UNIT will then connect
the incoming Fax call immediately to the attached FAX MACHINE, which is
connected to the DEVICE A port.

If a DTMF TONE (1 to 8) is detected, the appropriate MULTIPLE MODEM
SWITCH unit programmed for this code will immediately HOLD the call for 6
seconds before connecting the incoming call to the Modem. If another DTMF
TONE is detected within the 6 second wait period, the 6 second timer will
begin again. This will prevent any subsequent DTMF TONES that are sent
from the calling Modem, from interfering with the Modem’s handshake process.

If FAX T ONES or DTMF TONES are not detected within the 9 second ‘listening
period’, the MASTER UNIT will :

Connect the call to the DEVICE A port, if Dip Switch 1 is set ON.
or
Hang up the call without connecting it, if Dip Switch 1 is set OFF.

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MASTER and SLAVE units

If you are only using ONE MULTIPLE MODEM SWITCH unit, then this unit

should be set up as the MASTER UNIT .
If more than ONE MULTIPLE MODEM SWITCH unit is to be used, then you

need to SET UP each unit as follows :

MASTER UNIT (for a Fax and a Modem or for Two Modems)

The DTMF Code for Device A = 1. The DTMF Code for Device B = 2.

Set Dip Switch 1 = ON
Set Dip Switch 2 = ON
Set Dip Switch 3 = ON
Set Dip Switch 4 = ON

SECOND UNIT (for 1 or 2 additional Modems)

The DTMF Code for Device A = 3. The DTMF Code for Device B = 4.

Set Dip Switch 1 = OFF
Set Dip Switch 2 = OFF
Set Dip Switch 3 = ON
Set Dip Switch 4 = OFF

THIRD UNIT (for 3 or 4 additional Modems)

The DTMF Code for Device A = 5. The DTMF Code for Device B = 6.

Set Dip Switch 1 = OFF
Set Dip Switch 2 = OFF
Set Dip Switch 3 = OFF
Set Dip Switch 4 = ON

FOURTH UNIT (for 5 or 6 additional Modems)

The DTMF Code for Device A = 7. The DTMF Code for Device B = 8.

Set Dip Switch 1 = OFF
Set Dip Switch 2 = OFF
Set Dip Switch 3 = OFF
Set Dip Switch 4 = OFF

The Dip Switches are located on the underside of the unit.

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DTMF CONNECTION CODES

T o CONNECT to a MODEM fitted to any MUL TIPLE MODEM SWITCH on the
SHARED LINE, the calling MODEM must send one or more DTMF commands
(single digit numbers from 1 to 8) which are entered at the end of the dial
string.

These commands are entered at the end of the dial string after the entry of five
‘,’ characters.

Each ‘,’ instructs the Modem to wait 2 seconds before transmitting the next
character in the dial string.

Five ‘,’ commands therefore effects a 10 second delay before sending the
DTMF command.

This 10 second period will allow for the connection delay of 1-5 seconds for the
outgoing call and a further 5 second delay resulting from the 2 rings required to
cause the first MULTIPLE MODEM SWITCH to ANSWER the call.

At least 1 DTMF command must be detected in the 9 second ‘listening’ period,
which is present after the FIRST UNIT ANSWERS the call.

Therefore to ensure that a DTMF command is detected a total of three DTMF
Commands should be added to the end of the phone number to ensure detection
during the ‘listening period’.

Example: to access Modem Number 2
(fitted to the MASTER unit)
at telephone number [phone], the following phone number
should be dialed : 0212345678,,,,,2,2,2

Example: to access Modem Number 4
( fitted to the SECOND unit)
at telephone number [phone], the following phone number
should be dialed : 0398765432,,,,,4,4,4

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SINGLE UNIT INSTALLATION

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INSTALLATION

Single Unit Only

See Diagram on Page 7

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

2. Connect the LINE port of the MUL TIPLE MODEM SWITCH to the telephone

socket, using the supplied telephone line cord fitted with a male plug. See
Diagram on page 7.

3. Connect the FAX MACHINE (if used) to the DEVICE A port of the MASTER
unit, using the supplied RJ 6 pin to RJ 6 pin connection cable.

4. Connect your MODEM to the DEVICE B port of MUL TIPLE MODEM SWITCH
using the other supplied RJ 6 pin to RJ 6 pin connection cable.

5. If a Fax Machine is not to be used, connect your OTHER MODEM to the
DEVICE A port.

6. Set all connected FAX and/or MODEM devices to AUT O ANSWER on the
1st or 2nd ring.

7. Connect the POWER SUPPLY and SWITCH IT ON.

8. Set the Dip Switches located on the underside of the MUL TIPLE MODEM
SWITCH as follows :

Set Dip Switch 1 = ON
Set Dip Switch 2 = ON
Set Dip Switch 3 = ON
Set Dip Switch 4 = ON

Note - The DTMF Code for Device A = 1.

The DTMF Code for Device B = 2.

Note - Incoming Fax’s will transfer automatically to the attached

Fax Machine, if connected.

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MULTI-UNIT INSTALLATION

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INSTALLATION

Multiple Units

See Diagram on Page 9

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

2. If TWO MULTIPLE MODEM SWITCHES are to be fitted to one socket,

connect a Standard Double T elephone adaptor (not supplied) into the T elephone
Socket

If THREE or FOUR MULTIPLE MODEM SWITCHES are to be fitted to this
socket, connect a Modular Double Telephone adaptor (not supplied) into the
LINE IN Port of each MUL TIPLE MODEM SWITCH unit.

The First unit should then have a direct T elephone Line connection (using the
supplied Modular RJ T elephone Cable) from the Modular Double Adaptor to the
T elephone W all Socket.

Y ou should then use the other supplied Modular RJ style Telephone Cable to
connect between the vacant position of the Modular Double Adaptor connected
to the LINE IN port of the first unit and the Modular Double Adaptor connected
to the LINE IN port of second unit (Ie; connected in daisy fashion).

Y ou should connect the THIRD and FOURTH unit s using the same procedure
as the SECOND unit (Ie; connected in daisy fashion).

3. Connect the FAX MACHINE (if used) to the DEVICE A port of the FIRST
(MASTER) MUL TIPLE MODEM SWITCH, using the supplied RJ 6 pin to RJ 6
pin connection cable.

4. If a Fax Machine is not to be used, connect your MODEM to the DEVICE A
port.

5. Connect your OTHER MODEM to the DEVICE B port of AUTO-SELECT
using the other the supplied RJ 6 pin to RJ 6 pin connection cable.

INSTALLATION Cont

Multiple Units

6. Connect all OTHER MODEMS to the Device A and Device B ports of all
OTHER MUL TIPLE MODEM SWITCH unit s.

7. Set all connected FAX and/or MODEM devices to AUTO ANSWER on the

1st or 2nd ring.

8. Connect the POWER SUPPLIES and SWITCH THEM ON.

9. Set the Dip Switches located on the underside of EACH MUL TIPLE MODEM
SWITCH as follows :

SECOND UNIT

Set Dip Switch 1 = OFF
Set Dip Switch 2 = OFF

Set Dip Switch 3 = ON

Set Dip Switch 4 = OFF

THIRD UNIT

Set Dip Switch 1 = OFF
Set Dip Switch 2 = OFF
Set Dip Switch 3 = OFF

Set Dip Switch 4 = ON

FOURTH UNIT

Set Dip Switch 1 = OFF
Set Dip Switch 2 = OFF
Set Dip Switch 3 = OFF
Set Dip Switch 4 = OFF

The DTMF Access Codes for each unit are listed on page 5.

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SPECIFICATIONS

Dimensions (all in mm) : 106 (W) x 106 (D) x 43 (H)
Weight : 200g
Power Supply : 230V AC to 12V AC/500mA
Power Consumption : Idle - 0.5 Watts

Voice Call - 0.75 Watts
`Ringer Equivalence : 0.3 REN
T elephone Connectors : RJ 11 6 pin (2 centre)
Power Connector : 2.5mm barrel connector
ACMA COMPLIANCE : Supplier Number N782

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