Sonifex CM-TB8 User manual

Manufacturers of audio & video
products for radio & TV broadcasters
CM-TB8
8 Channel Talkback Control Unit
HANDBOOK
Manufacturers of audio
&
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deo
products
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or radio & TV broadcasters

CM-TB8 Handbook
Made in the UK by
This handbook is for use with the following product:
CM-TB8 8 Channel Talkback Control Unit
Stock Code: 30-267
©Sonifex Ltd, 2017
All Rights Reserved
Revision 1.06, April 2017
Sonifex Ltd, 61, Station Road, Irthlingborough,
Northants, NN9 5QE, England.
Tel: [phone]
Fax: [phone]
Email: [email protected]o.uk
Website: http://www.sonifex.co.uk
Information in this document is subject to change without notice and does not represent a
commitment on the part of the vendor. Sonifex Ltd shall not be liable for any loss or damage
whatsoever arising from the use of information or any error contained in this manual.
No part of this manual may be reproduced or transmitted in any form or by any means, electronic
or mechanical, including photocopying, recording, information storage and retrieval systems, for any
purpose other than the purchaser’s personal use, without the express written permission of Sonifex
Ltd. Unless otherwise noted, all names of companies, products and persons contained herein are
part of a completely fictitious adaptation and are designed solely to document the use of Sonifex
product.
Contents
Product Warranty - 2 Year Extended i
Sonifex Warranty & Liability Terms & Conditions i
1. Definitions i
2. Warranty i
Unpacking Your Product ii
Repairs & Returns iii
Conformity iii
Safety & Installation of Mains Operated Equipment iii
Voltage Setting Checks iii
Fuse Rating iii
Power Cable & Connection iii
WEEE Directive iv
Atmosphere/Environment iv
Introduction 1
Front Panel Controls, Connections & Indicators 2
Headphone Output Connection 2
Microphone Input Connection 2
Headset Connection 2
Talk Level Indicators 2
Input Select Indicators 2
Multi-Function Rotary Control 3
Group Talk Button 3
Channel 1 to 8 Talk Buttons 3
Channel 1 to 8 IFB/4W Select Switches 4
Channel 1 to 8 Monitor Level Potentiometers 4
Loudspeaker Mute Button 4
Loudspeaker Dim Potentiometer 4
Monitor Level Potentiometer 4
4W IN Input Connections 5
TB OUT Output Connections 5
IFB A & B Programme Input Connections 5
MIC Output Connection 5
Remote Connections 5
Ethernet Connection 5
LS Output Connection 5
Line-Up Tone Mode 6
Remotes 7
Remotes 1 – Outputs 7
Remotes 2 – Inputs 7
For the latest Sonifex handbook information please visit the
Sonifex website at www.sonifex.co.uk

Contents
Configuration Options 7
On-Board Configuration Mode 8
Embedded Web Server 9
Home Page 10
Network Settings Page 11
Display Settings Page 11
Microphone Settings Page 12
Talk Level Settings Page 12
Group Talk Settings Page 13
Channel Settings Page 13
Load Settings Page 14
Save Settings Page 14
Update Page 15
Configuration Option Defaults 16
Configuration Template Set 1 (read only) 16
Configuration Template Set 2 (read only) 16
Configuration Template Sets 3 to 6 17
Connection Example 18
Button Operation Reference 19
Connection Details 20
Headphone Output – ¼ inch (6.35mm) stereo jack socket 20
Microphone Input – Electronically balanced 3 pin female XLR-3 20
Headset – 5 pin female XLR-5 (microphone input is
electronically balanced) 20
4-Wire Inputs – Transformer balanced 3 pin female XLR-3 20
Talkback Outputs – Transformer balanced 3 pin male XLR-3 20
IFB Inputs – Transformer balanced 3 pin female XLR-3 20
Microphone Output – Electronically balanced 3 pin male XLR-3 20
Remotes 1 – 15-way ‘D’-type socket 20
Remotes 2 – 15-way ‘D’-type socket 20
Loudspeaker Output – ¼ inch (6.35mm) jack socket 21
Technical Specification 22
CM-TB8T Introduction 23
Enabling the Telephone Interface 23
Making a Telephone Call 24
Direct Dialling 24
Dialling Using an External Telephone Handset 24
Receiving a Telephone Call 24
Handling a Connected Telephone Call 24
Ending a Telephone Call 25
Embedded Web Server 25
PSTN Settings Page 25
PSTN Telephone Interface Connection Details 26
Telephone Line – RJ11 Socket 26
Telephone Handset – RJ11 Socket 26
CM-TB8G Introduction 27
SIM Card Requirements 27
Installing a SIM Card 27
Enabling the Telephone Interface 27
Making a Telephone Call 28
Direct Dialling 28
Dialling Using The Web Server 28
Receiving a Telephone Call 28
Handling a Connected Telephone Call 29
Ending a Telephone Call 29
Embedded Web Server 29
GSM Settings Page 30
GSM Specifications 31
Figures
Fig 1-1: System Block Diagram 1
Fig 2-1: CM-TB8 Front Panel 2
Fig 3-1: CM-TB8 Rear Panel 5
Fig 6-1: Home Page 10
Fig 6-2: Network Settings Page 11
Fig 6-3: Display Settings Page 11
Fig 6-4: Microphone Settings Page 12
Fig 6-5: Talk Level Settings Page 12
Fig 6-6: Group Talk Settings Page 13
Fig 6-7: Channel Settings Page 13
Fig 6-8: Load Settings Page 14
Fig 6-9: Save Settings Page 14
Fig 6-10: Update Page 15
Fig 8-1: Connection Example 18
Fig 12-1: Channel Settings Page 23
Fig 12-2: PSTN Settings Page 25
Fig 13-1: Channel Settings Page 28
Fig 13-2: GSM Settings Page 30

Warranty Registration
Sonifex Limited y61 Station Road yIrthlingborough yNorthamptonshire yNN9 5QE yUnited Kingdom
Tel: [phone] yFax: [phone] yEmail: [email protected]o.uk yInternet: www.sonifex.co.uk
Register Online for an
Extended 2 Year Warranty
As standard, Sonifex products are
supplied with a 1 year back to base
warranty.
If you register the product online, you
can increase your product warranty
to 2 years and we can also keep
you informed of any product design
improvements or modifications.
To register your product, please go online to www.sonifex.co.uk/register
Product:
Serial No:

i
Warranty
Product Warranty - 2 Year Extended
As standard, Sonifex products are supplied with a 1 year back to base
warranty. In order to register the date of purchase and so that we can keep
you informed of any product design improvements or modifications, it is
important to complete the warranty registration online. Additionally, if you
register the product on the Sonifex website, you can increase your product
warranty to 2 years. Go to the Sonifex website at: http://www.sonifex.
co.uk/technical/register/index.asp to apply for your 2 year warranty.
Note: For your own records the product serial number is recorded on the
CE certification page of this handbook.
Sonifex Warranty & Liability Terms & Conditions
1. Definitions
‘the Company’ means Sonifex Ltd and where relevant includes companies
within the same group of companies as Sonifex Limited.
‘the Goods’ means the goods or any part thereof supplied by the Company
and where relevant includes: work carried out by the Company on items
supplied by the Purchaser; services supplied by the Company; and software
supplied by the Company.
‘the Purchaser’ means the person or organisation who buys or has agreed
to buy the Goods.
‘the Price’ means the Price of the Goods and any other charges incurred by
the Company in the supply of the Goods.
‘the Warranty Term’ is the length of the product warranty which is usually
12 months from the date of despatch; except when the product has been
registered at the Sonifex website when the Warranty Term is 24 months
from the date of despatch.
‘the Contract’ means the quotation, these Conditions of Sale and any
other document incorporated in a contract between the Company and the
Purchaser.
This is the entire Contract between the parties relating to the subject
matter hereof and may not be changed or terminated except in writing in
accordance with the provisions of this Contract. A reference to the consent,
acknowledgement, authority or agreement of the Company means in
writing and only by a director of the Company.
2. Warranty
a. The Company agrees to repair or (at its discretion) replace Goods
which are found to be defective (fair wear and tear excepted) and
which are returned to the Company within the Warranty Term
provided that each of the following are satisfied:
i. notification of any defect is given to the Company immediately
upon its becoming apparent to the Purchaser;
ii. the Goods have only been operated under normal operating
conditions and have only been subject to normal use (and
in particular the Goods must have been correctly connected
and must not have been subject to high voltage or to ionising
radiation and must not have been used contrary to the
Company’s technical recommendations);
iii. the Goods are returned to the Company’s premises at the
Purchaser’s expense;
iv. any Goods or parts of Goods replaced shall become the
property of the Company;
v. no work whatsoever (other than normal and proper
maintenance) has been carried out to the Goods or any part of
the Goods without the Company’s prior written consent;

ii
Warranty
vi. the defect has not arisen from a design made, furnished or
specified by the Purchaser;
vii. the Goods have been assembled or incorporated into other
goods only in accordance with any instructions issued by the
Company;
viii. the defect has not arisen from a design modified by the
Purchaser;
ix. the defect has not arisen from an item manufactured by a person
other than the Company. In respect of any item manufactured
by a person other than the Company, the Purchaser shall only be
entitled to the benefit of any warranty or guarantee provided by
such manufacturer to the Company.
b. In respect of computer software supplied by the Company the
Company does not warrant that the use of the software will be
uninterrupted or error free.
c. The Company accepts liability:
(i) for death or personal injury to the extent that it results from the
negligence of the Company, its employees (whilst in the course of
their employment) or its agents (in the course of the agency);
(ii) for any breach by the Company of any statutory undertaking as to
title, quiet possession and freedom from encumbrance.
d. Subject to conditions (a) and (c) from the time of despatch of the
Goods from the Company’s premises the Purchaser shall be responsible
for any defect in the Goods or loss, damage, nuisance or interference
whatsoever consequential economic or otherwise or wastage of
material resulting from or caused by or to the Goods. In particular the
Company shall not be liable for any loss of profits or other economic
losses. The Company accordingly excludes all liability for the same.
e. At the request and expense of the Purchaser the Company will test
the Goods to ascertain performance levels and provide a report of
the results of that test. The report will be accurate at the time of the
test, to the best of the belief and knowledge of the Company, and the
Company accepts no liability in respect of its accuracy beyond that
set out in Condition (a).
f. Subject to Condition (e) no representation, condition, warranty or
other term, express or implied (by statute or otherwise) is given by
the Company that the Goods are of any particular quality or standard
or will enable the Purchaser to attain any particular performance
or result, or will be suitable for any particular purpose or use
under specific conditions or will provide any particular capacity,
notwithstanding that the requirement for such performance, result or
capacity or that such particular purpose or conditions may have been
known (or ought to have been known) to the Company, its employees
or agents.
g. (i) To the extent that the Company is held legally liable to the
Purchaser for any single breach of contract, tort, representation
or other act or default, the Company’s liability for the same
shall not exceed the price of the Goods.
(ii) The restriction of liability in Condition (g)(i) shall not apply to
any liability accepted by the Seller in Condition (c).
h. Where the Goods are sold under a consumer transaction (as defined
by the Consumer Transactions (Restrictions on Statements) Order
1976) the statutory rights of the Purchaser are not affected by these
Conditions of Sale.
Unpacking Your Product
Each product is shipped in protective packaging and should be inspected
for damage before use. If there is any transit damage take pictures of the
product packaging and notify the carrier immediately with all the relevant

iii
CE Conformity
details of the shipment. Packing materials should be kept for inspection and
also for if the product needs to be returned.
The product is shipped with the following equipment so please check to
ensure that you have all of the items below. If anything is missing, please
contact the supplier of your equipment immediately.
Item Quantity
Product unit 1
IEC mains lead fitted with moulded mains plug 1
Handbook and warranty card 1
If you require a different power lead, please let us know when ordering the
product.
Repairs & Returns
Please contact Sonifex or your supplier if you have any problems with your
Sonifex product. Email [e-mail] for the repair/
upgrade/returns procedure, or for support & questions regarding the
product operation.
Conformity
The products in this manual comply with the essential requirements of the
relevant European health, safety and environmental protection legislation.
The technical justification file for this product is available at Sonifex Ltd.
The declaration of conformity can be found at:
http://www.sonifex.co.uk/declarations
Safety & Installation of Mains
Operated Equipment
There are no user serviceable parts inside the equipment. If you should
ever need to look inside the unit, always disconnect the mains supply
before removing the equipment covers. The cover is connected to earth
by means of the fixing screws. It is essential to maintain this earth/
ground connection to ensure a safe operating environment and provide
electromagnetic shielding.
Voltage Setting Checks
Ensure that the machine operating voltage is correct for your mains power
supply by checking the box in which your product was supplied. The voltage
is shown on the box label. The available voltage settings are 115V, or 230V.
Please note that all products are either switchable between 115V and 230V,
or have a universal power supply.
Fuse Rating
The product is supplied with a single fuse in the live conducting path of the
mains power input. For reasons of safety it is important that the correct
rating and type of fuse is used. Incorrectly rated fuses could present a
possible fire hazard, under equipment fault conditions. The active fuse is
fitted on the outside rear panel of the unit.
Power Cable & Connection
An IEC power connector is supplied with the product which has a moulded
plug attached.
The mains plug or IEC power connector is used as the disconnect device.
The mains plug and IEC power connector shall remain readily operable to
disconnect the apparatus in case of a fault or emergency.
The mains lead is automatically configured for the country that the product
is being sent to, from one of:

iv
Safety & Installation
Territory Voltage IEC Lead Type Image
UK & Middle East 230V UK 3 pin to IEC lead
Europe 230V European Schuko round 2 pin to
IEC lead
USA, Canada and
South America 115V 3 flat pin to IEC lead
Australia & New
Zealand 230V Australasian 3 flat pin to IEC lead
Connect the equipment in accordance with the connection details and
before applying power to the unit, check that the machine has the correct
operating voltage for your mains power supply.
This apparatus is of a class I construction. It must be connected to a mains
socket outlet with a protective earthing connection.
Important note: If there is an earth/ground terminal on the rear panel of
the product then it must be connected to Earth.
WEEE Directive
The Waste Electrical and Electronic Equipment (WEEE)
Directive was agreed on 13 February 2003, along with the
related Directive 2002/95/EC on Restrictions of the use of
certain Hazardous Substances in electrical and electronic
equipment (RoHS). The Waste Electrical and Electronic Equipment Directive
(WEEE) aims to minimise the impacts of electrical and electronic equipment
on the environment during their life times and when they become waste.
All products manufactured by Sonifex Ltd have the WEEE directive label
placed on the case. Sonifex Ltd will be happy to give you information about
local organisations that can reprocess the product when it reaches its “end
of use”, or alternatively all products that have reached “end of use” can be
returned to Sonifex and will be reprocessed correctly free of charge.
Atmosphere/Environment
This apparatus should be installed in an area that is not subject to excessive
temperature variation (<0°C, >50°C), moisture, dust or vibration.
This apparatus shall not be exposed to dripping or splashing, and no objects
filled with water, such as vases shall be placed on the apparatus.

1
Introduction 1
Introduction
The CM-TB8 Talkback Control Unit is a powerful and highly
flexible self contained communications unit allowing multiple
4-wire and IFB connections within a single 1U rack space.
Using the latest DSP technology, the CM-TB8 integrates a high
quality, digitally controlled audio system with an intuitive
and configurable user interface. It offers easy connection to
any industry standard talkback system including the Sonifex
CM-TBU line listen unit plus the CM-CU1 and CM-CU21
commentator units.
The CM-TB8 provides 8 channels of 4-wire communication,
with 2 additional IFB inputs that can be routed to each
channel. The unit has individual connections for a microphone
and headset, and the gain for each input can be independently
set. Phantom power and a wide gain range ensure support for
most microphone types. All of the audio processing is done
in the digital domain. This gives greater control of the audio
mixing and routing functions and allows smoother changes in
signal level. Likewise, the volume potentiometers on the front
panel control gain digitally, ensuring noise free operation.
Fig 1-1: System Block Diagram

2 Front Panel Controls, Connections & Indicators
2
Headphone
Socket
Microphone
Input
Connection
Headset
Connection
Talk Level
Indicators
Input Select
Indicators
Multi-Function
Rotary Control
Channel
IFB/4W
Select Switch
Loudspeaker
DIM
Potentiometer
Loudspeaker
Mute Button
Channel
Monitor Level
Potentiometer
Channel
Talk
Button
Monitor
Level
Potentiometer
Loudspeaker
Front Panel Controls, Connections & Indicators
Fig 2-1: CM-TB8 Front Panel
Headphone Output Connection
The headphone output is via a ¼ inch (6.35mm) stereo jack socket capable
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headphones should not be used.
Microphone Input Connection
The electronically balanced microphone input is via a 3 pin female XLR-3
connector. The available gain for this input ranges from +6dB to +69dB.
Phantom powered microphones are supported on this input.
Headset Connection
The headset connection is via a 5 pin female XLR-5 connector. It shares the
same input and output circuits as the separate microphone and headphone,
but the gain settings are independent and the available range is from +6dB
to +69dB. Changing the input type automatically selects the corresponding
gain settings. Phantom power is also available on this input.
The microphone and headset inputs are protected by a level limiter. The
limiter will start to function when the input signal exceeds approximately
+8.5dB. When the limiter is active, the input select LED indicators will
illuminate red instead of amber. When the input signal is reduced and the
limiter turns off, the input select indicators return to amber illumination.
Talk Level Indicators
In the normal operating mode, the left indicator illuminates green when
the gain adjusted microphone signal exceeds 0dB, and the right indicator
illuminates red when the signal exceeds +8dB.
Input Select Indicators
In the normal operating mode, these indicators illuminate amber to show
which microphone type is currently selected, and whether phantom power
is enabled. They also show when the microphone limiter is actively limiting
the level of the signal, by changing from amber to red.

3
Front Panel Controls, Connections & Indicators 2
Multi-Function Rotary Control
The rotary control has various functions which are dependent on the
current operating mode.
In the normal operating mode, the rotary control can adjust the talk level.
This is the level of the microphone signal routed to the talkback outputs.
The selected microphone gain settings and the subsequent microphone
output level at the rear panel connector are not changed.
To adjust the talk level: first ensure that the function is enabled and the
required range of adjustment has been selected. See the Talk Level Settings
Page in the Embedded Web Server. Turn the rotary control to increase or
decrease the current talk level within the limits set by the talk level adjust
options. There is an additional option that requires the rotary control to
be pressed before any adjustment to the talk level can be made. With
this option selected, the adjustment mode will timeout after 1 second of
inactivity of the rotary control.
The rotary control also accesses the microphone select and microphone
gain and filter setup modes.
To access the microphone select and microphone gain and filter setup
modes: press and hold the rotary control for 3 seconds whilst in the normal
operating mode. The two talk level LEDs will illuminate red. Turn the rotary
control to select the mode to enter, either microphone gain and filter setup
mode when the two talk level LEDs are illuminated, or microphone select
mode when MIC, Phantom and HS LEDs are illuminated. When the required
LEDs are illuminated, press the rotary control to enter the associated mode.
If the rotary control is not turned or pressed for 3 seconds, this function will
timeout and the unit will return to normal operation. Please note, entering
microphone gain and filter setup mode resets the current talk level adjust
value to zero.
To change the selected microphone type: once in microphone select mode,
the currently selected microphone setting LEDs will flash. Turn the rotary
control to change the selection. Both microphone and headset type can be
selected with or without phantom power. A brief press on the rotary control
will return the unit to normal operation.
To change the microphone gain and filter: once in the microphone gain
and filter setup mode, the talk buttons on channels 1-8 will illuminate
to show the approximate current gain setting for the currently selected
microphone. Turn the rotary control to increase or decrease the gain. With
no buttons illuminated, the gain is approximately 6dB. The gain increases
by approximately 8dB as each talk button is illuminated with the maximum
gain of approximately 69dB gain when all talk buttons are illuminated.
The talk level LEDs will show the current level of the microphone signal as
it exceeds 0dB and +8dB respectively, and the microphone signal can be
monitored in the headphones.
The state of the microphone filter is shown on the LS mute button LED.
If the LED is illuminated red, the filter is on. Press the LS mute button to
enable or disable the filter.
Once the required microphone gain and filter setting has been set, a brief
press on the rotary control will return the unit to normal operation.
Group Talk Button
The group talk button simultaneously activates all of the talk buttons that
have been included in the group talk function. By default, all channels are
included. When the group talk function is active, the button illuminates red,
as do the talk buttons on the channels activated by the group talk function.
By default, the button has a momentary action that will automatically latch
in the on state if pressed briefly.
Channel 1 to 8 Talk Buttons
Each talk button routes the currently selected microphone signal to the
corresponding talkback output. When a talk button is active, it illuminates
red. The channels audio call indication illuminates the talk button green
when the signal level on the corresponding 4W IN input rises above -12dB.

2 Front Panel Controls, Connections & Indicators
4
The audio call is not shown on talk channels that are active. By default, the
talk buttons have a momentary action that will automatically latch in the on
state if pressed briefly.
Channel 1 to 8 IFB/4W Select Switches
These switches select the operating mode for each channel, either 4 wire
or interruptible fold back. The IFB input to each channel can be either the
channels own 4W IN input, or one of the two dedicated programme inputs,
IFB A or IFB B. This selection is made in the configuration options using
either the on-board configuration mode or the embedded web server. See
the Configuration Options section. As an alternative to the standard IFB
modes, where the microphone signal interrupts the IFB signal when the
channel is active, an additional option allows the microphone signal to be
mixed with the IFB signal. In this mode, when a talk channel is activated,
the level of the selected IFB input signal on that channel is reduced by 12dB
prior to being mixed with the microphone signal.
To use a talk channel in 4W mode: put the IFB/4W switch in the 4W
position. In this mode, the signal on the 4W IN input connector is routed to
the headphones/headset and loudspeaker at the level set by the channels
own monitor level potentiometer, with the overall level controlled by the
MON level potentiometer. When the talk button is pressed, the microphone
signal is routed to the channels talkback output at the TB OUT connector,
and the level of the feed to the loudspeaker (not headphones/headset) is
reduced by the level preset by the dim potentiometer.
To use a talk channel in IFB mode: put the IFB/4W switch in the IFB
position. In this mode, the signal on the 4W IN input connector is routed to
the headphones/headset and loudspeaker at the level set by the channels
own monitor level potentiometer, with the overall level controlled by the
MON level potentiometer. The signal from the selected IFB input, either
the channels own 4W IN input or one of the dedicated programme inputs,
IFB A or IFB B, is routed to the talkback output at the TB OUT connector.
When the talk button is pressed, the signal at the talkback output is either
replaced by or mixed with the microphone signal, and the level of the feed
to the loudspeaker (not headphones/headset) is reduced by the level preset
by the dim potentiometer.
Channel 1 to 8 Monitor Level Potentiometers
These controls set the level of the signal that is routed to the monitor
headphones/headset and loudspeaker from each channels input.
Loudspeaker Mute Button
The loudspeaker mute cuts the signal fed to the loudspeaker and the
loudspeaker output on the rear panel. The mute can also be activated via a
remote input, see the Remote section. The button has a latching action and
illuminates red when activated or flashes red to indicate the loudspeaker
mute has been activated by the remote input. The button also indicates
when the loudspeaker dim is active by illuminating green. The mute button
does not affect the signal routed to the headphones.
Loudspeaker Dim Potentiometer
The loudspeaker dim pre-set potentiometer controls the level of
attenuation applied to the signal fed to the loudspeaker and rear panel
loudspeaker output when any of the talk channels are active, or the
loudspeaker dim remote input is active. The attenuation range is between
full on and muted and it is adjusted using a small flat blade screwdriver.
Monitor Level Potentiometer
The monitor level potentiometer controls the overall level of the signal
routed to the headset/headphone outputs, the loudspeaker and the
loudspeaker output on the rear panel.

5
Rear Panel Connections 3
Rear Panel Connections
Fig 3-1: CM-TB8 Rear Panel
4W IN Input Connections
The transformer balanced 4W IN inputs are via 3 pin female XLR-3
connectors. These are the main audio inputs to each channel.
TB OUT Output Connections
The transformer balanced TB OUT talkback outputs are via 3 pin male XLR-3
connectors. These are the main audio outputs from each channel.
IFB A & B Programme Input Connections
The transformer balanced IFB inputs are via 3 pin female XLR-3 connectors.
MIC Output Connection
The electronically balanced microphone output is via a 3 pin male XLR-3
connector. It outputs the gain adjusted, level limited signal from the
selected microphone or headset input.
4W Inputs IFB Inputs
Microphone
Output
Mains Power
Inlet
Ethernet
Talkback Outputs Remotes Loudspeaker
Output
Remote Connections
The remote connections are via two 15-way ‘D’-type sockets. All of the
remote outputs are on the remote 1 connector, whilst the inputs are all on
the remote 2 connector. See the Remotes section on for connection details.
Ethernet Connection
The Ethernet connection provides 100Mb network capabilities via a RJ45
connector.
LS Output Connection
The loudspeaker output is via a ¼ inch (6.35mm) jack socket. When an
external loudspeaker is connected, the internal loudspeaker is muted.

4 Line-Up Tone Mode
6
Line-Up Tone Mode
The CM-TB8 has a built in Test Tone generator which selectively routes
a line-up tone of 1kHz at 0dB to all talkback outputs to assist channel
identification and cabling checks. There are two test tone modes, manual
and auto.
To enable line-up tone mode: press and hold the rotary control and the
group talk button and channel 1 and 2 talk buttons for 5 seconds. The group
talk button will flash amber to indicate the line-up tone mode has been
entered. The rotary control, group talk button and talk buttons can now be
released. By default, manual mode is enabled.
To switch between manual and auto tone modes: turn the rotary control
one position in either direction.
In manual line-up tone mode, press the talk buttons on each channel to
route test tone to the corresponding talkback output. Each talk button will
illuminate amber when pressed. When a button is released, the tone on
that talkback output will be muted.
In auto line-up tone mode, each of the eight talkback outputs are
automatically identified by a unique number of short tone bursts, lasting
0.25 seconds each, which are repeated every 5 seconds. Each talk button
flashes amber to indicate when tone is being routed to that channel, and
the number of pulses corresponds to the channel number.
The 4W IN inputs function normally and any signal present is still routed to
the loudspeaker and headphone monitor outputs. This could be useful in
allowing the user to receive instructions on which channel to output tone to
when using the test tone in manual mode.
To exit the line-up tone mode: press the rotary control once. The unit will
then return to normal operating mode.

7
Remotes 5
Remotes
The two remote connectors on the rear panel provide a selection of
remote inputs and outputs. All of the remote outputs are on the Remotes 1
connector and are open collector outputs, and all of the remote inputs are
on the Remotes 2 connector and are active low.
Remotes 1 – Outputs
Pin1: Channel 1 Talk active – open collector output
Pin2: Channel 2 Talk active – open collector output
Pin3: Channel 3 Talk active – open collector output
Pin4: Channel 4 Talk active – open collector output
Pin5: Channel 5 Talk active – open collector output
Pin6: Channel 6 Talk active – open collector output
Pin7: Channel 7 Talk active – open collector output
Pin8: Channel 8 Talk active – open collector output
Pin9: Group Talk active – open collector output
Pin10: Loudspeaker Dim active – open collector output
Pin11: Loudspeaker Mute active – open collector output
Pin12: Channels 1-8 Audio Call active – open collector output
Pin13: Ground
Pin14: Ground
Pin15: Ground
The remote outputs are “tally” indicators and the talk active outputs
indicate when any of the channel talk or group talk buttons are active. The
loudspeaker dim and mute outputs indicate the state of the signal routed
to the internal and external loudspeakers. The audio call active remote
output indicates when the signal level on one or more of the 4W IN inputs
is greater than -12dB.
Remotes 2 – Inputs
Pin1: Channel 1 Remote Call – active low input
Pin2: Channel 2 Remote Call – active low input
Pin3: Channel 3 Remote Call – active low input
Pin4: Channel 4 Remote Call – active low input
Pin5: Channel 5 Remote Call – active low input
Pin6: Channel 6 Remote Call – active low input
Pin7: Channel 7 Remote Call – active low input
Pin8: Channel 8 Remote Call – active low input
Pin9: Loudspeaker Dim enable – active low input
Pin10: Loudspeaker Mute enable – active low input
Pin11: no connection
Pin12: no connection
Pin13: Ground
Pin14: Ground
Pin15: Ground
When a remote call is active, the corresponding talk button flashes amber.
This call condition takes priority over the audio level activated call input on
each channel. The loudspeaker mute input, when active, takes priority over
the mute button operation.

6 Configuration Options
8
Configuration Options
The CM-TB8 has a wide range of user configurable options. These options
are arranged in sets, with an active set which contains the current working
settings, and six configuration set templates that allow settings to be stored
and recalled at a later date. Two of the configuration templates, sets 1 and
2, are read only and cannot be modified. The other four, sets 3 to 6, can be
used to store customised settings. This allows the unit to be preconfigured
for a range of user scenarios which can be instantly recalled. There are two
methods available for modifying the configuration settings, the on-board
configuration mode and the embedded web server. Any configuration
settings that are changed using either of these two methods only affect the
active set.
On-Board Configuration Mode
The on-board configuration mode allows a limited number of configuration
options in the active set to be modified without the need of a PC. It also
allows the active set to be saved to one of the four editable sets, 3 to 6.
To enter the on-board configuration mode: press and hold the rotary
control and channel 7 and 8 talk buttons for 5 seconds. The 2 talk level LEDs
and the LS mute button LED will flash red to indicate the configuration mode
has been entered. The rotary control and talk buttons can now be released.
There are four configuration options available in this mode and the MIC,
Phantom and HS LEDs illuminate red in sequence to indicate which option
is currently being displayed. Option 4 is shown when all three LEDs are
illuminated. The value of the selected option on a channel is shown by a
sequence of recurring red flashes on the corresponding talk button, one
flash equals mode 1, two flashes equals mode 2 etc.
To cycle through the options: press the group talk button once. The MIC,
Phantom and HS LEDs will change to indicate which new option is being
displayed.
To change the current option setting: press the corresponding talk button
once. The number of flashes will increase to indicate the new setting. Once
the maximum option mode setting has been reached, the value will wrap
around to mode 1.
The on-board configuration mode options are listed below:
Option 1 – Channel inclusion in the group talk function (MIC LED is
illuminated)
Mode 1 – channel is excluded from the group talk function
Mode 2 – channel is included in the group talk function
Option 2 – Channel IFB mode (Phantom LED is illuminated)
Mode 1 – 4W IN is IFB, Mic signal interrupts talkback signal when
talk is active
Mode 2 – IFB A IN is IFB, Mic signal interrupts talkback signal when
talk is active
Mode 3 – IFB B IN is IFB, Mic signal interrupts talkback signal when
talk is active
Mode 4 – 4W IN is IFB, Mic signal is mixed with talkback signal
when talk is active
Mode 5 – IFB A IN is IFB, Mic signal is mixed with talkback signal
when talk is active
Mode 6 – IFB B IN is IFB, Mic signal is mixed with talkback signal
when talk is active
Option 3 – Channel 1 & 2 telephone interface mode (HS LED is illuminated
Mode 1 – Normal mode
Mode 2 – Telephone mode (requires telephone expansion card to
be fitted)
Option 4 – Save the active set (MIC, Phantom and HS LEDs illuminated)
This option allows the current active set to be saved to set 3, 4, 5 or 6 by
pressing and holding the talk button on the channel corresponding to the
required set number for 3 seconds. The talk button will illuminate will

9
Configuration Options 6
flash red, then amber, then green to confirm the set has been saved. For
example, to save the active set to set 5, press and hold the channel 5 talk
button for 3 seconds.
Press and hold channel 3 Talk button for 3 seconds to save the
active set to set 3
Press and hold channel 4 Talk button for 3 seconds to save the
active set to set 4
Press and hold channel 5 Talk button for 3 seconds to save the
active set to set 5
Press and hold channel 6 Talk button for 3 seconds to save the
active set to set 6
To exit the on-board configuration mode: press and hold the group talk
button for 3 seconds. The unit will then return to normal operating mode.
Embedded Web Server
The CM-TB8 has an embedded web server which provides easy access to all
of the configuration options through a web browser. It also gives access to
system settings and allows the firmware to be easily updated when new
releases are made available.
To use the embedded web server, the unit needs to be connected to a
network via the Ethernet port on the rear panel. By default, the CM-TB8
is configured as a DHCP client and when connected to a network, it will
search for a DHCP server in order to obtain its IP address. If no DHCP
server is found within 45 seconds, the unit will default to its default static
network settings. To order to access the unit on the network, it is first
necessary to determine the current active IP address.
To discover the current active IP address: press and hold the rotary
control and the group talk button for 3 seconds. All the LEDs on the
front panel will turn off. The rotary control and group talk button can
now be released. For each subsequent press of the rotary control, the
current digit within the IP address will be shown on the group talk and
talk buttons. The MIC, Phantom and HS LEDs indicate which digit is being
shown within the current part of the IP address. The LS mute button LED
illuminates to indicate a “dot” which separates each part of the address.
For example, for the address 192.168.0 124, the following sequence of
LEDs will be illuminated:
Address MIC Phantom HS Group
Talk
Talk
1
Talk
2
Talk
3
Talk
4
Talk
5
Talk
6
Talk
7
Talk
8
LS Mute
1
9
2
.
1
6
8
.
0
.
1
2
4

6 Configuration Options
10
After the last digit of the IP address has been displayed, the next press of
the rotary control returns the unit to the normal operating mode. If the
address is 0.0.0.0, a valid IP address has not yet been obtained from a DHCP
server within the 45 second timeout period.
Once the IP address of the unit is known, simply type this into the address
bar of a web browser. The home page of the connected CM-TB8 will be
displayed.
Each page within the web server is accessed via one of the tabs in the menu
bar below the title banner. Some tabs also have drop down sub-menus.
Each page follows a similar format, the left side shows the main content
of the page, either information or options and settings, and the right side
gives a brief description of the each item. Pages that include configuration
options also have a submit button. This transfers the new settings on the
current page to the connected unit.
Home Page
Fig 6-1: Home Page
The home page provides some general information about the connected
CM-TB8. The serial number, firmware and boot loader version numbers
should be quoted if you ever need to contact Sonifex Ltd about the unit.

11
Configuration Options 6
Network Settings Page
Fig 6-2: Network Settings Page
This page shows the network related settings. The unit name allows the
connected CM-TB8 to be easily identified if there is more than one unit on
the network. The IP address, subnet mask and gateway IP address are used
only if DHCP is disabled, or if a DHCP server is not detected on the network
within a timeout period of 45 seconds.
Display Settings Page
Fig 6-3: Display Settings Page
This page shows the display settings. The LED brightness setting changes
the illumination intensity of the front panel buttons and indicators to allow
for a range of installation environments.

6 Configuration Options
12
Microphone Settings Page
Fig 6-4: Microphone Settings Page
The first sub-item under the configuration tab shows the microphone
options. Both the microphone and headset inputs have individual gain
control, and the type option determines which settings are currently used.
Enable the phantom power option when using microphone or headsets that
require a 48V dc power supply. The filter option enables a band pass filter
that reduces the level of signals outside of the normal speech bandwidth.
Please note, updating the options on this page resets the current talk level
adjust value to zero.
Talk Level Settings Page
Fig 6-5: Talk Level Settings Page
The talk level adjustment range sets the amount of microphone gain
adjustment available. This is the second sub-item under the configuration
tab. If this feature is enabled, the adjustment is made by turning the rotary
control. An alternative option requires the rotary control to be pressed
before any adjustment can be made.