NatComm Multiple Modem Switch User manual

Multiple Modem Switch
USER GUIDE
For Technical Assistance
Please Phone: [phone]

Page 2 National Communications
PACKING LIST
Your MULTIPLEMODEMSWITCH is suppliedas acomplete
kit,ready forquickand easyinstallationby theuser.
Description Qty
MULTIPLEMODEM SWITCHLineSharing Unit 1
12VPower supply 1
TelephoneLine cord,fitted withamale plug 1
RJ11 (6 pin) to RJ11 (6 Pin) connection cables 2
UserGuide 1

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PRODUCT DESCRIPTION
OurMULTIPLE MODEM SWITCH devices are designedforapplicationswhere
multiple telephone devices, which have Modem facilities, and are required to
RECEIVE INCOMING MODEM CALLS andshare the sametelephone line.
Up to FOUR MULTIPLE MODEM SWITCH’s can be fitted toONE LINE, to
providefor connection of up to8 separate devices.
Each MULTIPLE MODEM SWITCH willallowTWO devices to be added toit.
In total up to 7 Modems and 1 Fax Machine can share a FaxTelephone Line,
or up to 8 Modems can share one telephone line.
Each MULTIPLE MODEMSWITCHdeviceprovidesBARGE-INPROTECTION,
whichwill ensure thatonly one of thesetelephone devices canhave access to
the telephone line at any one time.
SHARING A DEDICATED FAX LINE
YourMULTIPLE MODEM SWITCH willanswerall incoming callsafter2 rings.
Ifthe incoming call isa Fax Call,theinternal Fax Switchwill 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
YourMULTIPLE MODEM SWITCH willanswerall incoming callsafter2rings.
Incoming Modem(Data) callsare automaticallyrouted toany 1of 7attached
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 SWITCHES can be fitted to ONE LINE, to
providefor connection of up to8 separate devices.
ONE MULTIPLE MODEM SWITCH unit (called the MASTER) should be set
toANSWERincoming calls.All other MULTIPLEMODEM SWITCH unitsshould
havetheANSWERfacility 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
DEVICEAport of the MASTER unit. You 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 otherAUTO-SELECTunits will then “listen” to the line
for up to 9 SECONDS.
Ifa FAXTONE(CNGTONE)isdetected, the MASTERUNITwill thenconnect
the incoming Fax call immediately to the attached FAX MACHINE, which is
connected to the DEVICEAport.
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
fromthecallingModem,frominterferingwiththeModem’shandshakeprocess.
IfFAXTONESorDTMFTONESarenotdetected within the 9second‘listening
period’,the MASTERUNIT will:
Connect the call to the DEVICEAport, 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
To CONNECTto aMODEM fitted to any MULTIPLE MODEM SWITCH on the
SHAREDLINE,the calling MODEM mustsendone or more DTMFcommands
(single digit numbers from 1 to 8) which are entered at the end of the dial
string.
Thesecommands are entered atthe end ofthedial string afterthe entry offive
‘,’ 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
DTMFcommand.
This10second period will allowforthe connection delay of1-5seconds for the
outgoingcalland a further 5seconddelay resulting from the2rings required to
cause the first MULTIPLE MODEM SWITCH toANSWER the call.
Atleast 1 DTMF commandmust be detectedin the 9 second‘listening’ period,
which is present after the FIRSTUNITANSWERS the call.
Thereforeto ensurethat a DTMF command isdetected atotal of three DTMF
Commandsshould beaddedtothe endofthephonenumbertoensuredetection
duringthe ‘listeningperiod’.
Example: to access Modem Number 2
(fitted to the MASTER unit)
attelephone number [phone], the followingphone number
shouldbe dialed : 0212345678,,,,,2,2,2
Example: to access Modem Number 4
( fitted to the SECOND unit)
attelephone number [phone], the followingphone number
shouldbe dialed : 0398765432,,,,,4,4,4

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SINGLE UNIT INSTALLATION

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INSTALLATION
Single Unit Only
SeeDiagram onPage 7
1. Unplug all equipment from the telephone socket to be used.
2. ConnecttheLINEportoftheMULTIPLEMODEM SWITCH to the telephone
socket, using the supplied telephone line cord fitted with a male plug. See
Diagramon page 7.
3. Connectthe FAX MACHINE (ifused) to theDEVICEAportof the MASTER
unit, using the supplied RJ 6 pin to RJ 6 pin connection cable.
4. ConnectyourMODEMtotheDEVICEBportofMULTIPLE MODEMSWITCH
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
DEVICEAport.
6. Set all connected FAX and/or MODEM devices toAUTOANSWER 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 MULTIPLE 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 Codefor DeviceA= 1.
TheDTMF Codefor 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
SeeDiagram onPage 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,
connectaStandardDoubleTelephoneadaptor(notsupplied) into theTelephone
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
LINEIN Port of eachMULTIPLE MODEM SWITCH unit.
TheFirst unitshould thenhave adirectTelephone Line connection (using the
suppliedModularRJTelephoneCable)fromtheModularDoubleAdaptorto the
Telephone WallSocket.
You should then use the other supplied Modular RJ style Telephone Cable to
connectbetweenthevacantpositionoftheModularDoubleAdaptorconnected
tothe LINE IN port ofthe firstunit and the Modular DoubleAdaptor connected
to the LINE IN port of second unit (Ie; connected in daisy fashion).
Youshould connect theTHIRD andFOURTHunitsusingthe 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)MULTIPLE MODEM SWITCH,usingthe supplied RJ6 pin toRJ 6
pinconnection cable.
4. If a Fax Machine is not to be used, connect your MODEM to the DEVICEA
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
OTHERMULTIPLE MODEM SWITCH units.
7. Set all connected FAX and/or MODEM devices to AUTOANSWER on the
1st or 2nd ring.
8. Connect the POWER SUPPLIES and SWITCH THEM ON.
9.Set theDipSwitcheslocatedontheundersideofEACH MULTIPLE MODEM
SWITCH as follows :
SECONDUNIT
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
FOURTHUNIT
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
PowerSupply : 230VAC to 12VAC/500mA
PowerConsumption : Idle - 0.5 Watts
Voice Call - 0.75 Watts
`RingerEquivalence : 0.3REN
Telephone Connectors : RJ 11 6 pin (2 centre)
PowerConnector : 2.5mmbarrelconnector
ACMACOMPLIANCE : SupplierNumberN782
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