DTSystems TDS1S/R User manual

Handbook Contents Box Contents
HSafety 1 x TDS1
IInstallation 1 x Power Supply
IFacilities 1 x Telephone Lead
IOperation 1 x Handbook
ITroubleshooting
IWarranty
ITechnical Details
This symbol is used to alert the user to important operating or
maintenance instructions.
The Lightning bolt triangle is used to alert the user to the risk of electric
shock.
SAFETY
1. It is important to read these instructions and follow them.
2. Keep this instruction manual for reference.
3. Do not operate this unit in a damp environment. It is not waterproof.
4. Refer installation and servicing to qualified personnel.
5. This unit is double insulated and safe to use without an earth connection. The
case does not connect to a protective earth unless provided by the screen of
the line input XLR connector (pin 1).
INSTALLATION - Please read ALL this Manual before starting
First of all, plan your installation and decide where to fit your TDS1. It needs to be
close to a telephone socket, have mains power and an audio signal feed. In
MANual mode, you will be using a telephone to call the listener, so it may be
convenient to install the unit in an ante or side room where no-one will be
disturbed by your conversations. The TDS1 generates virtually no heat and so
can be installed in any dry, convenient location.
Unpack your TDS1 and check the contents against the list above. As supplied,
your TDS1 is set to 100V line input and 3 hour timer enabled.
You will need the following to
Get your TDS1 to work:
lWorking telephone line
lAudio signal
lMains power
lAnother telephone eg a mobile to
test operation.
lTwo small screwdrivers, a posidrive
to remove the lid and a flat blade to
adjust the volume.
Issue 1.2
January 2006
For latest Handbook
see www.dt4u.com
15V
ac/dc
Power
supply
TDS1
Telephone Socket
PA Amplifier
Power
Audio
Telephone
Telephone Dialup System
TDS1 HANDBOOK

Audio Inputs
Twist together
100V speaker line
12
3Line Input
Female XLR
Socket Twist together
Low Z Speaker feed
12
3
12
3
0V
Unbalanced Line Out (Rec Out)
12
3
0V
Balanced Line Out
**IMPORTANT**
If using a 100V line signal, you
MUST set the attenuator to the
highest setting (J1 + J5)
BEFORE turning your TDS1 on
for the first time. There is a risk
of damaging the input circuits if
you ignore this advice.
INPUT ATTENUATOR
Link Out
Link In
J1 J2
J10
2V
J9
5V
J8
15V
J7
35V
J6
75V
J5
125V
100V Line In
0dB Line In
As shown in the drawing,
the attenuator is selected
(J1) and the unit set for a
15V (J8) input signal.
This might be typical of a
low impedance loudspeaker where the signal is taken from directly across the loudspeaker.
Always start with link in position J5 and move towards J10 to set a sensible volume with the
gain control in mid position. LED 5 should flash faintly in sympathy with the input signal.
3 Hour Timer J17
Enabled Link=In
Line Fuse 100mA x2
Auto / Man
Switch
Active
LED
Power On/Off
Switch + Indicator
LED
100mA
PowerSupply
Fuse 20mm
J5
J10
J17
Attenuator Links
J1 J2
100V Line In
0dB Line In
Telephone
Line In
Telephone
Line Out
XLR Audio
Input
Facilities
Socket
Power
In
PCB Layout
Drawing
NOTE: Not to scale. Drawn for clarity
100V
2V
VR1 Adjust
Send Volume
FS2 FS1
FS5
LED 5 Compressor Control
Microprocessor

Setting Up
Remove the case lid.
Turn the TDS1 on. Check the green power light illuminates continuously.
Check the Active light flashes, once for AUTOmatic, twice for MANual. This
confirms the microprocessor is running.
Play a CD at normal volume over the PA system.
Adjust the attenuator settings until the internal green light (LED 5 immediately
behind the input XLR socket) flashes (weakly) in time with the CD audio signal. If
the signal is too small, move the attenuator link one position eg from J5 to J6 (or
J7 to J8 etc) until the light flashes. With a very small input signal such as a
12
3
Telephone
Interface
Circuit
Compressor
VR1
Send Level
J2
J1
Connected to
Case Only
XLR Socket
Audio Input
LED 5 Compressor
Control Signal
J5
J10
Attenuator
Telephone
Line
Isolation Barrier
Start by wiring in the audio feed cable and terminate with a male 3 pin XLR plug.
Wire the XLR plug according to the type of input signal as shown. Note that pin 1
of the XLR connects to the case of the TDS1 unit and should be grounded at the
source end.
The TDS1 has a balanced 3 wire audio input which allows it to work remotely,
without electrical interference, even with long lengths of feed cable attached. You
can use an unbalanced low level 2 wire feed (eg record out), but keep the feed
cable short (<2m) to avoid hum and noise interference. Unbalanced inputs should
have pins 1 and 3 connected together and both of these connect to the screen
(braid) of the incoming audio feed cable.
The signal source can be any line level signal from 0.5V up to a 100V line
speaker feed. Taking the output from the terminals of a loudspeaker will also
work, though you will need a much lower attenuator setting (around 15V).
WARNING It is possible to get an electric shock from a 100V speaker line
during peak audio output. Switch the PA system off to prevent the risk of
electric shock when making connections.

record output, move link J1 to J2 (this disables the attenuator).
AUTOmatic Mode
Switch the TDS1 to AUTOmatic.
Dial the TDS1 telephone line from another telephone. The call should be
answered immediately, the Active light should illuminate and you should hear the
CD playing.
Adjust VR1 to get the best quality signal. If the sound is distorted or crackles,
reduce VR1 until the sound is clear.
You may need to select a different attenuator link (J5-J10) to get the best
performance. Some experimentation will quickly determine the optimum settings.
Release the call.
The TDS1 should clear down and reset.
Redial the TDS1 telephone line.
The TDS1 should again answer the call and connect to the PA sound.
Release the call.
MANual Mode
Plug a telephone into the front of the TDS1 and call the test telephone.
Answer the call.
Briefly move the switch on the TDS1 to the H/R (Hold / Release) position. The
Active light should illuminate. You should now hear the PA system through the
test telephone and be able to talk to the other telephone as well.
Replace the handset on the telephone plugged into the TDS1 front panel. You
can unplug the telephone if you wish.
You should remain connected and be able to hear the PA system through the
test telephone.
To end the call, press and hold the switch down to the H/R position for around
three seconds or until the Active light extinguishes. Your test telephone should
now be disconnected from the PA system.
3 Hour Timer Link
An additional safety feature is available when the TDS1 is used in MANual
mode. Under normal circumstances, once established, a MANual call, held by
the TDS1, would remain connected indefinitely. For long meetings, this may be
desired. However, for shorter meetings, the possibility exists that the TDS1
operator may forget to disconnect the call and this could be expensive in call
charges. By enabling the 3 hour timer link (J17), the TDS1 will automatically
release the call after 3 hours.
Link Out - 3 hour timer disabled
Link In - 3 hour timer enabled
J17 can be found to the left of
the microprocessor.
NOTE
If power is lost when a call is established, connection will be lost and the
calling party must redial.
J17
Link

TDS1 Facilities Output
The facilities socket is for advanced users who want to extend the capabilities of the
TDS1. It enables remote AUTO / MAN switching and allows a remote Active light to
be used. The remote light can be very useful to indicate the TDS1 is in use and
connected. Pin1 is normally configured as an additional remote LED output.
However it can be wired as a remote start to special order. The remote start (switch
to 0V) can be used to start a messaging service or recorded announcement
message or even as an on/off switch.
Pin Description
1Remote LED/Start
20V
3Remote AUTOmatic
4Remote LED
5Remote MANual
Facilities Wiring Diagrams
Close switch to
enable
AUTOmatic
mode
Press switch to
Hold / Release
a MANual call
NOTES
Pin 2 (0V connection). To make it easier to connect multiple return wires to pin
2, solder a thick length of wire onto the pin to extend it by 10-15mm. Solder the
returns onto this thick wire. Insulate connections to prevent short circuits
between pins.
Use a fine tipped soldering iron to make connections. Whilst short circuited
connections are unlikely to damage your TDS1, they certainly won’t help
matters! Check all connections thoroughly and insulate between pins.
Ensure that the switch on the TDS1 is set to the centre MANual position if you
wish to use remote switching. (Otherwise the remote AUTOmatic mode will not
work).
Remote Active
LED
0V
1
2
To remote
equipment
Remote Start equivalent circuit
(Available to special order)
TDS1
Facilities Socket is
a 5 Pin DIN
Connector
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5

TDS1 OPERATION
Switch the TDS1 on. Note the green power light illuminates and the Active light flashes,
one flash for automatic operation, two flashes for manual. This confirms the
microprocessor is running. If a remote indicator is fitted, this flashes in sympathy with the
Active light. The TDS1 is now ready for use.
MANual mode Put the switch to Manual. In this mode, both the Dialup unit and a
normal telephone need to be connected to the line. Dial the number of the person
nominated to listen in and wait until connected. After establishing connection move the
switch from the Manual position to the H/R (Hold / Release) position and keep it pressed
until the green Active light comes on and you can hear sound from the system. Replace
the telephone handset (hang up). The Active light remains on and the called person can
hear the program. Press the H/R switch for about 3 seconds at any time to disconnect the
Dialup and end the call - green Active light goes out. The call is automatically ended after
about 3 hours as a safety precaution though this option can be defeated by moving an
internal link.
Note that the TDS1 when set to the MANual position and not holding a call, is effectively
disconnected and will not answer calls or transmit any audio. This can be useful if
confidential meetings are scheduled and it is important not to allow anyone to listen in.
Automatic Mode When set to AUTOmatic there is nothing to do - the first incoming
telephone caller is automatically connected to the sound system and remains connected
until they choose to terminate the call. Pressing the H/R switch has no effect and will not
release the line. Turn off the power to disconnect the caller if necessary.
General Operating Pointers The sound operator will need to think about his new role
in broadcasting the program not only in terms of his local audience, but also those now
connected by land line. Unlike a live audience who may be able to half hear even with the
microphone turned off, those listening in will hear nothing at all if the sound operator fails
to react quickly to someone speaking and this is especially noticeable when using a
switch to turn microphones on and off, perhaps missing the first word or sentence even.
Like a normal radio station, total silence in the program is highly undesirable and can
mislead the listener to think there is a fault in the system perhaps even causing them to
hang up and end the call by mistake. To avoid this, the sound operator must always be
transmitting something even a small amount of background noise (chatter) will help. This
is especially important before and after the meeting as well as in between program items.
Even during the singing of songs, a small amount of audio via a half opened microphone
(not the one next to the chairman please!) will greatly enhance the program output to
those listening in and make them feel totally involved. Thought is required by the sound
operator as to what is being heard by the listeners. His efforts in this regard will be highly
valued by the callers.
Multiple callers may be able to listen on each telephone line by using the ‘three way caller'
option. Results for this service can be very patchy and depend upon a number of factors,
but it is worth trying. Some users routinely connect four different locations via two
telephone lines. If each caller also has a three way option, even more callers could be
connected though this is unproven. (Please feedback any results on this to us).
Anyone using the service is well advised to buy a modern loudspeaking telephone which
has a mute feature. This cuts off the internal microphone on the telephone and can make
the sound even clearer especially if multiple users are connected on each line. If the
telephone is placed on a hard surface then the volume will be found adequate for a room

with three or four people in it. For larger venues or locations where the volume is not
adequate i.e. many miles from the serving telephone exchange, use a handset with jack
audio output. This allows connection from the telephone line into a line input (i.e. CD)
on a hi-fi system and hence the signal can be adjusted for loudness and quality by using
the volume and tone controls. Of course this could also be used in remote areas for
tying halls together when for example the public speaker is unable to get to the venue
for whatever reason or even for memorial overflow situations.
The TDS1 Dialup Unit is microprocessor controlled and makes use of surface mount
technology to achieve small size together with high reliability. There are no moving parts
to wear out and all components are conservatively rated to give a long service life.
These instructions are written to help you get the best from your Dialup unit but they
need to be followed closely especially by the sound operator if you are to achieve this.
For best possible results, invest in an automatic microphone mixer to avoid missing the
first word or even sentence of any comments, as this is highly frustrating to Dialup
users.
TROUBLESHOOTING See www.dt4u.com for latest information
1 No Power Make sure the power supply is plugged in and the mains
socket live. Ensure that the TDS1 is switched on. If the
green power light is unlit, unplug the power supply and
check the fuse (FS5) is not blown. If it is, replace by a 100mA
20mm fuse. Do NOT replace with a larger fuse or permanent
damage will be caused.
2 Cuts Off Do not try to send too loud a signal down the telephone line
otherwise this will be interpreted by the microprocessor as a
disconnect signal. If the received sound crackles or cuts off,
reduce the output level (VR1) until a clear sound is received.
If you have been connected for around three hours and then
the TDS1 cuts off, check that the three hour timer link (J17)
is disabled (out).
3 Too Quiet There is a limit to how loud the signal is that can be sent
down a telephone line. If the received sound is too quiet, the
user will need an amplified telephone or better, a hands free
telephone with volume control. Some models are louder than
others so ask for a demonstration.
4 No Connection The TDS1 seems to be working in MANual mode but won’t
answer calls in AUTOmatic. Check that the telephone line
works and that you are dialing the right number. Plug an
ordinary telephone into the line jack and test the line. If you
can make and receive calls, check the telephone lead
between TDS1 and telephone socket. There are two
telephone line fuses within the TDS1. Disconnect the
telephone line and test FS1 and FS2.
5 No Audio Check all the audio wiring for continuity. Ensure the audio
signal is applied between XLR pins 2 and 3.
6 Storm There was a storm and now the TDS1 does not work. Return
to base for repair and check.
7Erratic After connecting the facilities wiring, the TDS1 becomes
unreliable. Could be faulty wiring (intermittent joints or short
circuits). Or the wiring could run close to a source of
electrical interference eg thyrister lighting - re-route the
cable.
8Remote Remote LED doesn’t work - Reverse the connections.

WARRANTY
The TDS1 is guaranteed for a period of 1 year from the date of purchase
provided that it has been used in accordance with all these instructions. This
warranty specifically does NOT cover damage by lightning or user abuse and is
on condition that the unit is returned by prior agreement, to the supplier. Repair
or replacement is at the discretion of the supplier under the terms of this
warranty.
In the unlikely event that your TDS1 fails, please contact the supplier for a
return address. When returning a unit, use the original packaging, be sure to
include a return address and contact point, and include a brief description of the
problem. We will provide a repair estimate if asked in advance.
TECHNICAL DETAILS
Power: 15V AC/DC 100mA
Fuses: 1 x 20mm 100mA Power
2 x 100mA Boxed Line
Audio: 0.5V - 100V input
Remote Start Capable of switching 80mA to 0V
Remote LED 5V output via 470ÙResistor
REN: 1.0
Approvals: CE approved
DOC Declaration Of Conformity - Available on request
ACCESSORIES
Available to special order and at additional cost for this product - see
www.dt4u.com for more details.
OVERVIEW
The TDS1 (Telephone Dialup System - 1 line) was originally designed to allow
anyone to dial into a sound system and listen live to the program audio feed. In
the AUTOmatic mode, the TDS will answer the first incoming telephone call
and connect the caller to the audio. In the MANual mode, calls can be
established and controlled from the TDS unit. The facilities connector allows
access to various switching and output signals and can be used to operate
remote equipment, generate alarms or give visual indication of status.
This makes the TDS unit valuable for many applications ranging from:
IRemote monitoring of audio signals such as transmitter sites.
ILive monitoring of a sound system.
IMessaging services.
IAudio program hookups.
IRemote switching.