AEV ITB 302 Evolution User manual

AEV S.p.A.
Via della Tecnica n.3
I-40050 Argelato Bologna Italy
Sales department Tel. [phone] E-mail [email protected]
Fax [phone]
Web site www.aev.net U.S.A. mirror www.aev-usa.com
ITB 302ITB 302
ITB 302ITB 302
ITB 302
DIGITAL TELEPHONE HYBRID
Operating Manual
V.1,08
By Roberto Paganelli 27-05-2005

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AEV S.P.A VIA DELLA TECNICA N.3 I-40050 ARGELATO BOLOGNA ITALY WWW.AEV.NET WWW.AEV-USA.COM E-MAIL: [e-mail]
Guarantee
The equipment is warranted for a period of 2 years from the date of invoice (ex-works). The
warranty does not cover faults provoked by carelessness, natural causes and parts subject to
wear. In addition, the cost of labour and shipment is not covered. The warranty will be voided if
the equipment is mishandled.
Feedback
AEV welcomes your comments on our products. Your suggestions may be extremely useful to
develop new equipment and manuals and this will be of benefit to you too! Let us have your
comments on our products and we will be pleased to read them. Send
your information by e-mail to the following address: [email protected], or send a letter to the AEV
SERVICE Department.
Technical Support
If you require technical support, contact AEV SERVICE giving a clear and concise account of your
specific problem. Quote the serial number of your equipment by referring to the AEV nameplate
attached to the equipment itself as this is the most important piece of information to be provided.
Telephone: 39+051+6634711 Fax: 39+051+6634700
Factory Service and Repairs
If problems arise while the equipment is being installed, consult this manual and check that the
installation is being carried out properly. If the problems still cannot be solved, call the AEV
SERVICE Department for further information. If the problem is a minor one we can a telephone
call will probably suffice. If, on the other hand, the equipment is to be shipped to AEV for service
or repairs, the AEV SERVICE Dept. will accept it only if the RMA return authorisation number has
been provided. This number must be included in the shipping documents. We also recommend
providing a detailed description of the fault which has occurred, the type of service needed and
(if required) the name of the employee at the AEV SERVICE Dept. you have spoken to. No repairs
will be made if the cost of shipment is charged to AEV. In this case, we will not accept the
delivery.
Shipping Instruction
When shipping the equipment to AEV, use the original package in order to be certain that it will
be fully protected during handling. If you need the original package, call us for a new one.
If you ship the equipment in a different packing container, take care to provide a double package
by interposing padding material between the two containers in order to fully protect the
equipment during shipment. The package should be marked "FRAGILE" in red.
Remember that the RMA number must be clearly visible on the package. If it is not, the equipment
will not be accepted.
Copyright AEV S.p.A. '96-'05. All rights reserved. No part of this publication may be reproduced,
trasmitted, archived in a reference system or translated into other languages in any form or by
any means without the written consent of AEV S.p.A.

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SAFETY PRECAUTIONS
IMPORTANT: Carefully read this paragraph as it contains
important instructions concerning operator safety and directions
regarding the installation, operation and maintenance of the
equipment.
Failure to observe the safety instructions and information given in
this manual constitutes an infringement of the safety rules
and design specifications provided for this piece of
equipment.
AEV S.p.A. declines all responsibility if any one of the safety
rules given herein is not observed.
AEV S.p.A. declines all responsibility if the end-user resells
the product.
The equipment is to be used by people capable of operating it in a
trouble-free manner and it is assumed that they are aware
of the following safety rules.
• Keep this manual with the utmost care and close at hand so that
it can be consulted whenever needed
• After unpacking the equipment, check it for condition.
• Avoid banging the equipment.
• Thepacking material (plasticbags, polystyrene, nails,etc.)must
never be left within the reach of the children, as these items
are potential sources of danger.
• Do not use the equipment in places where the temperature is not
within the recommended range, as specified by the manufacturer.
• Before connecting the equipment, make sure the nameplate
specifications correspond to the mains electricity supply (the
nameplate is located on the equipment enclosure).
• Do not remove the sticker from the equipment as it contains
important specifications and the relevant serial number.
• To join the equipment to the mains supply, use the power cord
purchased with the equipment.
• The equipment must be used only for the purpose it was
designed for.
• Abuse or misuse of the equipment is extremely dangerous
for people, pets and property. The manufacturer declines all
responsibility for damage and injury resulting from improper
use and mishandling.
• Certain basic safety rules must be observed when using
electrical equipment, in particular:
- Never touch the equipment with wet and/or damp hands or
other parts of the body.
- Keep the equipment away from drops of water or sprinkling
systems.
- Never use the equipment near high heat sources or explosive
material.
- Do not introduce any extraneous matter into the equipment.
- Do not allow children or untrained people to use the equipment.
• Before cleaning or servicing the equipment outside, disconnect
it from the supply and wait at least 2 seconds before working on
it, as recommended by current safety regulations.
• In the event of faults and/or improper operation, turn off the
equipment, shut off the electrical power and call your dealer.
• Do not attempt to make repairs and/or adjustments when
covers/guards or circuit boards are to be removed.
• Blown fuses inside the power supply indicate that there may be
a fault in the power supply itself. The fuses must be replaced by
qualified and authorised persons. It is advisable to call your
nearest dealer.
• Call your dealer for any repairs and be certain original spare
parts are used. Failure to observe this rule may adversely
affect the safety level of your equipment.
• The equipment is to be connected to the mains supply and
provided with adequate and efficient earth conductors.
• The electrical wiring must be done in compliance with current
electrical codes CEI 64-8 “Electrical specification for domestic
buildings”.
• When installing, leave a clearance of at least 1 cm around the
equipment to allow air to pass freely.
NOTE. This piece of equipment has been manufactured
to the highest standards of workmanship. It must be
used properly and serviced as recommended to ensure
long-term dependable operation.
The installation must be done in order to be able to
guarantee an easy access to the cable of feeding.
The device of dissection of the equipment is the
cable of feeding, so it must be unconnected from
the equipment every time it is necessary to do any
type of maintenance.
SICHERHEITSINWEISE
ACHTUNG! Die im folgenden Abschnitt beshriebenen Hinweise
mit Sorgfalt lesen, da sie wichtige Informationen über die
Sicherheit, die Installation, die Bedienung und die Wartung
enthalten.
Die Nichterfüllung der Vorschriften oder der spezifischen
Warnungen, die in diesem Handbuch enthalten sind, verletzt die
Zeichnungs-, Herstellungs- und Bedienungssicherheitsnormen
dieses Gerätes. AEV S.p.A. lehnt jegliche Verantwortung ab,
auch wenn nur ein Teil der folgenden Vorschriften nicht erfüllt wird.
Nur Fachpersonal kann das Gerät benutzen und es wird
vorausgesetzt, daß das zuständige Personal von diesen
Vorschriften Kenntnis hat.
• Das vorliegende Handbuch soll für ein evtl. künftiges
Nachschlagen mit Sorgfalt aufbewahrt werden; es soll sich in der
Nähe des Gerätes befinden und soll leicht auffindbar sein.
• Nach der Entfernung der Verpackung, die Vollständigkeit des
Gerätes prüfen. Falls einige Zweifel bestehen, verwenden Sie
das Gerätes prüfen. Falls einige Zweifel bestehen, verwenden
Sie das Gerät nicht und wenden Sie sich an den Händler.
• Mechanische Schocks vermeiden, die das Gerät beschädigen
könnten.
• Das Verpackungsmaterial (Plastiktüte, Polystirol, Nägel, u.s.w.)
soll nicht in der Reichweite von Kindern verlassen werden, da es
eine potentielle Gefahrquelle darstellt.

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• Das Gerät soll nicht in Umgebungen verwendet werden, wo die
Temperatur nicht innerhalb des Bereichs liegt, der gemäß den
angegebenen technischen Merkmalen zugelassen ist.
• Vor dem Anschluß des gerätes prüfen ob die Schilddaten den
Daten der elektrischen Versorgung entsprechen (das Schild ist
auf dem Gerätegehäuse angebracht).
• Das Klebschild auf dem Gerät, das die wichtigsten Daten der
Maschine und die Serien-nr. zeigt, soll nie entfernt werden.
• Für den Anschluß an das Versorgungsnetz kann nur das
mitgelieferte Kabel verwendet werden.
• Das vorliegende Gerät kann nur für die Benutzung verwendet
werde, für die das Gerät ausdrücklich ausgelegt wurde.
• Jegliche andere Benutzung ist als unsachgemäss zu verstehen
und deshalb ist für Personen, Tiere oder Gegenstände potentiell
gefährlich.
• Die Verwendung eines elektrischen Gerätes sieht die Einhaltung
einiger Grundnormen vor, wie:
- Das Gerät nicht mit feuchten oder naßen Händen oder
Wasserspritzen ausgesetzt werden
- Das Gerät soll nicht in der Nähe von Wärmequellen und wo
Explosivstoffe vorhanden sind, verwendet werden Kein fremder
Gegenstand in das Gerät einsetzen
- Das Gerät soll nicht von Kindern und/oder unfähiges ohne
Überwachung verwendet werden.
• Vor Reinigungs- und/oder Wartungsarbeiten soll das Gerät von
der elektrischen Versorgung durch die Entfernung des
Versorgungskabels ausgeschaltet werden und soll man 2 sek.
abwarten, wie von den Sicherheitsnormen vorgeschrieben.
•Fallseine StörungodereineFehlfunktion desGerätesvorhanden
sind, sollen das Gerät und das Versorgungskabel vom Netz
ausgeshaltet und keinen Eingriff an das Gerät durchgeführt
werden.
• Keine Instandsetzungs- und/oder Einstellungsarbeit
durchführen, die die Entfernung von Deckeln oder das
Herausziehen von Karten vorsehen.
• Das Brechen der Sicherung innerhalb des Netzteils ist ein
Zeichen einer generellen Störung des Netzteils; das Netzteil kann
nur von autorisiertem Personal ersetzt werden. Wir empfehlen,
sich an den Händler zu wenden.
• Für eine evtl. Instandsetzung von Original-Ersatzteilen forden.
DieNichteinhaltung der o.g.Empfehlungkönnte die Sicherheitdes
Gerätes beeinträchtigen.
• Das Gerät soll an das Versorgungsnetz angeschlossen
werden, die mit ordnungsgemässer und wirksamer Erdung
ausgestatten werden soll.
• Die Ausführung der elektrischen Anlange soll den CEI Normen
64-8 "Normen der elektrischen Anlagen für Zivilgebäuden"
entsprechen.
• Während der Installation ist es ausdrücklich, einen freien Raum
von 1 cm um das Gerät vorzusehen, um eine ordnungsgemässe
Belüftung gewährzuleisten.
N.B.: Das Gerät is fachgerecht hergestellt. Die elektrische
und mechanische Zuverlässigkeit wird erhalten, wenn
das Gerät ordnungsgemäss benutzt wird
und wenn die Wartungsvorschriften, falls
vorgesehen, beobachtet werden.
Durch diese Installation wird der Zutritt zur
Speisungskabel garantiert.
Die Abteilungsvorrichtung dieses Apparates ist eigentlich
die Speisungskabel, deswegen ist es notig den Apparat
unverbinden, wenn man braucht jeder.
Instandhaltung zu machen.
PRECAUTIONS
ATTENTION, lire toutes les instructions donnè es dans ce
paragraphe car elles concernent la securitè, l'installation, l'emploi
et l'entretien.
Ne pas accomplir les régles et les prècautions spécifiques
données dans ce manuel est une violation des règles de
sécurité de dessin, de construction et d'emplol de cet
appareil.
AEV S.p.A. décline toute responsabilité si on ne suit pas même
seulement une partie de ces précautions.
AEV S.p.A. décline toute responsabilité si l'utilisateur final revend
le produit.
L'emploi s'adresse à un personnel qui est en mesure d'utiliser cet
appareil et qui connaît les précautions suivantes.
• Garder soigneusement ce manuel pour toute autre consultation.
Il doit être gardé près de l'appareil ou dans un lieu où on peut le
trouver avec facilité.
• Après avoir enlevé l'emballage il faut s'assurer de l'intégrité de
l'appareil. Si on a quelques doutes ne pas utiliser l'appareil et
s'adresser au détaillant.
• Eviter des shocks mécaniques qui peuvent endommager
l'appareil.
• Les élèments de l'emballage (les sachets de plastique, le
polystyrolène, les clous, etc. ) ne doivent pas être laissés à la
portée des enfants car ils peuvent être un danger pour eux.
• Eviter l'utilisation de l'appareil dans des lieux où il n'y a pas une
tempera ture qui est dans l'intervalle admis par les
caractéristiques techniques déclarées.
• Avant de connecter l'appareil vérifier que les données de la
plaque correspondent à celles du réseau de distribution électrique
(la plaque est située sur le conteneur de l'appareil).
• Ne jamais enlever (pour n'importe quelle raison) la plaque
adhésive qui se trouve sur l'appareil et qui contient les données
essentielles de la machine et la matricule.
• Pour la connexion au réseau d'alimentation utiliser seulement le
câble de réseau qui est vendu avec l'appareil.
• Cet appareil devra être utilisé seulement pour l'usage dont il a
été conçu.
• Tout autre usage doit être considéré impropre et donc
potentiellement dangereux pour les personnes, les animaux et
les choses. Le constructeur n'est pas responsable pour les
dommages qui dérivent des usages impropres, erronés et irraisonnés.
•L'usaged'un appareilélectriqueprévoitl'observation dequelques
règles fondamentales.En particulier:
- Nepastoucherl'appareilavecvospartiesducorpsouilléeset/ouhumides.
- L'appareil ne doit pas être exposé à stillation et /ou aux jets d'eau.
- Ne pas utiliser l'appareil près des sources d'une forte chaleur et
en présence d'explosifs.
- Ne pas chercher à introduire des objects étrangers dans
l'appareil.
- Ne pas permettre que l'appareil soit utilisé par des enfants et / ou
par des incapables sans surveillance.

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• Avant de faire n'importe quelle opération de nettoyage et / ou
d'entretien,débrayer l'appareilduréseau d'alimentationélectrique
en enlevant le cordon de réseau et attendre au moins 2 secondes,
en suivant ainsi les normes qui régularisent la sécurité.
• Si on a une panne et / ou un mauvais fonctionnement de
l'appareil, il faut l'éteindre, deconnecter l'alimentation, ne pas
l'endommager et s'adresser au détaillant.
• Ne pas chercher à faire une réparation et / ou une mise à point
qui rend nécessaire le déplacement des couvercles ou
l'extraction des fiches.
• La rupture du fusible dans l'alimentation signifie qu'il y a une
panne de l'alimentation même; son remplacement doit être fait
seulement par le personnel autorisé. On conseille de s'adresser
directement au détaillant.
•Pour uneréparation s'adresserau détaillantet exigerl'utulisation
des pièces de rechange originales. Ne pas respecter ces normes
peut compromettre la sécurité de l'appareil.
• L'appareil doit être connecté au réseau d'alimentation qui a une
ligne de terre réglementaire et fonctionnante.
• L'exécution de l'installation électrique devra être conforme à la
norme C.E.I 64-8 "Normes des installations électriques dans les
édifices civils".
• Quand on installe l'appareil on doit prévoir une espace libre
autour de lui d'à peu près 1 cm pour garantir une bonne aération.
N.B. L'appareil a été construit dans les règles
de l'art. La fiabilité électrique et mécanique
sera toujours efficace si on utilise
correctement l'appareil et si on respecte les
prescriptions d'entretien.
L’installation doit être faite de façon à consentir un
simple accès au câble d’alimentation.
Le dispositif de sectionement de l’equipement est le
câble d’alimentation. Il est pourtant nécessaire de le
détâcher chacque fois on nécessite de pratiquer
n’importe quel genre d’entretien.

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Contents
Guarantee ..................................................................................................................................................... 2
Feedback....................................................................................................................................................... 2
TechnicalSupport ......................................................................................................................................... 2
Factory Service and Repairs......................................................................................................................... 2
ShippingInstruction....................................................................................................................................... 2
SAFETYPRECAUTIONS .............................................................................................................. 3
SICHERHEITSINWEISE................................................................................................................ 3
PRECAUTIONS ............................................................................................................................. 4
Telephonehybrids............................................................................................................................. 7
FeaturesofAEVITB-302 ................................................................................................................ 7
Installation ........................................................................................................................................ 8
GeneralDescription .......................................................................................................................... 9
Thefrontpanel ................................................................................................................................. 9
Therear panel ................................................................................................................................10
Theremotecontrol ......................................................................................................................... 10
Ontelephonelines .......................................................................................................................... 12
Connectionstomixerandlines ........................................................................................................ 12
Hanging-onaline ............................................................................................................................ 12
Adjustinglevels............................................................................................................................... 12
Conferencemode ........................................................................................................................... 12
Releasingaline ............................................................................................................................... 12
Remotecontroloperation ofmixer .................................................................................................. 12
Expansions ..................................................................................................................................... 13
4-wirelines..................................................................................................................................... 13
TechnicalData ................................................................................................................................14
AUDIOLEVELS........................................................................................................................... 14
INSERT ......................................................................................................................................... 14
HYBRIDCIRCUIT ....................................................................................................................... 14
4 WIRE SECTION........................................................................................................................ 15
MEETINGSECTION ................................................................................................................... 15
GENERALDATA .......................................................................................................................... 15
Connections ................................................................................................................................... 16
ConnectionsEXPANDERS/REMOTE ......................................................................................... 17
Expander 1.................................................................................................................................................. 17
Remote........................................................................................................................................................ 17
Expander 2.................................................................................................................................................. 17

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Telephone hybrids
A telephone hybrid is a system that is able to make an audio connection between a telephone
line and low frequency equipment. In practice this connection is by no means simple since
the characteristics of the telephone line require the equipment to employ a series of
techniques to ensure good audio quality and immunity to interference.
The bandwidth of a normal telephone line is compressed from about 100 Hz to 3-4 KHz in
order to guarantee a good reproduction of the human voice. A telephone hybrid must have a
wide frequency response in order to adapt to the quality of any line and to avoid adding
further limitations to the system. Unfortunately telephone lines are often sources of intense
disturbances, noise, crackling, fading etc. Furthermore they are often sources or conductors
of static charge and overvoltage, able to destroy circuits which have been imprudently
connected to them. Add the fact that the resistive and capacitative behaviours of line are
not uniform, and thus barely repeatable, and clearly the transmitted audio quality will vary
with time.
It is therefore necessary to take particular care in the design of line-audio interfaces in order to
avoid significant degradation of the bandwidth or re-injection of induced interference. The
interface must also ensure complete electrical isolation between the line section and that
connecting to the audio equipment.
Another problem arises during a telephone connection between a remote correspondent
and an interviewer or DJ; the DJ’s voice will be transmitted down the telephone line and,
since the same line is used for transmission and reception, received again with a delay
with respect to the original. It will be re-amplified and looped back resulting in whistles
and Larsen effects. Usually, antilocal circuits are designed to solve this matter by
identifying those audio components which tend to enter into the loop and eliminating
only the part which re-enters. This is indispensable for Audioconferences.
The new Digital Hybrid features with an electronic echo canceller, that allows to reduce
drastically or even eliminate the feedback. In this way the diaphony is improved thanks
to the use of a DSP.
Audioconferencing allows simultaneous communication between remote correspondents that are
interconnected through telephone lines and the hybrid, which interconnects them without
introducing distortions or noise. It allows also to the DJ to participate in the conference. The
DJ, as “manager” of the conference, is able to include or exclude each correspondent from the
conference and can also speak privately to each of them for instance to prepare the interview.
Features of AEV ITB-302
AEV ITB-302 is a telephone hybrid that satisfies all today’s demands for studio and broadcast
telephony allowing total management of telephone lines. It is designed in a 19", 1 unit, rack-
mounting container, housing 1 or 2 telephone hybrids. Units may be interconnected to allow
expansion to “n” lines whilst maintaining simplicity of use and the possibility of remote control.
The telephone lines, appropriately filtered and isolated, allow Audioconferencing between them
and the DJ. An internal microprocessor provides a range of functions that, until now, have been
difficult to provide in the same unit. All potentiometers were eliminated in order to solve wear
problems. It is also available a socket on the rear panel to connect a headset.

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Installation
AEV ITB-302 telephone hybrid has been designed and manufactured to conform to current safety
standards. The unit should only be installed by competent personnel and in compliance with
operator safety requirements and environmental specification. Great care should be taken in
making earth and ground connections to the unit and associated equipment. As for any
electronic equipment, adequate ventilation for cooling must be ensured in order to guarantee
operating temperatures within the limits defined in the Technical Specifications section. This is
particularly important in case of rack mounting or installation in confined or poorly ventilated
locations. It is advisable to leave a space between each unit and adjacent units (above and
below) even if mounted in a ventilated rack. If well connected to the rack’s ground and earth
connections, the unit will be immune to interference including RF, as long as the high frequency
units have been correctly connected. AEV ITB-302 is anyhow fitted with RF filters on its inputs
in order to eliminate annoying interference. Gas discharge tubes are fitted to the telephone
lines to guarantee immunity from static charges or over-voltages.

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General Description
The front panel
The front panel of AEV ITB-302 is divided into 4 sections.
The first 2 sections from the left are identical and allow control over the telephone hybrids.
Four switches with associated LED indicators perform the following functions:
1) 2 WIRE / 4 WIRE Switches the hybrid of the section in use from 4 - wire to 2 - wire operation
2) MEETING Puts the line into conference mode
3) 

OFF HOOK Hangs-on the line (equivalent to picking up the handset)
4) 1 KHz SEND Generates a 1 KHz note at 0 dBm for local and remote adjustment
5) Two level controls are situated on the input section which allow adjustment of the receive
and send transmission levels; each one fitted with a LED level display (DOT mode), and a trimmer
to adjust line levels.
The following controls are located in the third section:
6) BUZZER ON / AUTOLOCK SWITCH
When turning the equipment on the buzzer will be enabled alone (incoming).
Pressing the switch successively: first it enables the Autolock and Hang-up; second it disables
the buzzer but not the Autolock and Hang-up; third it disables the Buzzer, the Autolock and
Hang-up; fourth it returns to the initial position.
7) PANEL/REMOTE SWITCH Switches between panel control or remote control.
8) MEETING LEVEL Adjusts the level during conference
The line power indicator lamp is situated in the fourth section.

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The rear panel
The rear panel contains all the connectors required to connect to the outside world.
1 Switch POWER Switch On/Off
2 AC POWER Line power socket
3 REMOTE 25-way Cannon connector for remote control
4 EXPANDER 1 9-way Cannon connector for expansion
5 EXPANDER 2 9-way Cannon connector for expansion
Plus two identical sections for the two lines, comprising:
6 4 WIRE RX TX 4-wire line connection
7 SEND Line input (from Mixer)
8 RECEIVE Line signal output
9 INSERT 9-way Cannon connector for insert
connection to the reception circuit and head.
10 TEL SET Line telephone connection
11 TEL LINE Line connection for 2-wire lines
The remote control
AEV ITB-302 can be fitted with an optional remote control, allowing control of the hybrid and its
functions. The remote control reproduces the front panel functions of the unit for the sections
related to the two lines and to the general one.

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Two buttons are located on the upper part:
BUZZER ON/AUTOLOCK SWITCH
Successively pressed it enables or disables the incoming call buzzer and Autolock with Hang-up
functions together.
Indicator leds facilitate programming of these functions.
PANEL/REMOTE BUTTON
Switches between panel control and remote control.
On the lower part, two identical sections relating to lines 1 and 2, allow control of:
2 WIRE / 4 WIRE
Switches the hybrid of the section in use from 4-wire to 2-wire operation
1 KHz SEND
Generates a 1 KHz note at 0 dBm for local and remote adjustment
MEETING
Puts the line into conference mode
OFF HOOK
Hangs-on the line (equivalent to picking up the handset)

PAG. 12 ITB 302ITB 302
ITB 302ITB 302
ITB 302
Electronic Equipment
Electronic Equipment
Electronic Equipment
AEV S.P.A VIA DELLA TECNICA N.3 I-40050 ARGELATO BOLOGNA ITALY WWW.AEV.NET WWW.AEV-USA.COM E-MAIL: [e-mail]
On telephone lines
Connections to mixer and lines
The connection of AEV ITB-302 to 2-wire telephone lines is made by inserting the telephone cable
into the corresponding socket on the ITB-302 using a standard telephone line connector.
Other telephonic equipment may be connected by inserting a standard connector in the
appropriate ITB-302 socket. This is useful for making calls and checking the line. Its connection
is optional.
For connection to 4-wire lines it is advisable to check input and output connections.
The mixer output should be connected (balanced or unbalanced) to the hybrid’s SEND input,
whilst the feedback (RECEIVE) can be connected to the cue input of the same mixer.
))
))
)WARNING: TAKE GREAT CARE IN CONNECTING LOOP-BACKS TO THE MIXER. FAILURE TO DO SO CAN GENERATE
HUM, ECHOES AND “TUBE” EFFECTS.
Hanging-on a line
To hang-on a line, simply press the (OFF HOOK) button located on the front panel, or on the
remote control. If the autolock function has been enabled, the unit will automatically hang-on
the line after a few rings.
Adjusting levels
Once the line has been seized, adjust the send and receive levels by injecting the 1 KHz test
signal with the corresponding button, or with a standard signal, and calibrate the levels for a
near zero reading on the LED meters.
Conference mode
Once the line has been hang-on connection is made and maintained. The MEETING button
connects the line to the meeting circuit. In this configuration, the lines that have the relevant
MEETING button pressed, will be connected to each other enabling an audioconference.
Releasing a line
Pressing the OFF HOOK button a second time, on the front panel or on the remote control, it
releases the line. It is equivalent to putting the handset on-hook.
Remote control operation of mixer
The remote control allows the AEV ITB-302 to be installed in a conveniently located rack near
the telephone line sockets. Once the levels have been adjusted on AEV ITB-302 , the remote
control allows control of the following functions: on-hook, off-hook, conference mode etc.,
directly from the mixer or from the remote telephone location, for simple and rapid operation.

PAG. 13
ITB 302ITB 302
ITB 302ITB 302
ITB 302
Electronic Equipment
Electronic Equipment
Electronic Equipment
AEV S.P.A VIA DELLA TECNICA N.3 I-40050 ARGELATO BOLOGNA ITALY WWW.AEV.NET WWW.AEV-USA.COM E-MAIL: [e-mail]
Expansions
MORE THAN 2 LINES
AEV ITB-302 is expandible, allowing connection of more than one unit in cascade, all remotely
controllable and able to perform audioconferencing. No modifications are necessary, except for
the addition of further units and their corresponding cables.
4-wire lines
AEV ITB-302 features an interface for normal 2-wire lines and, as an option, for 4-wire lines. This
allows, amongst other things, connection to cellular telephones.

PAG. 14 ITB 302ITB 302
ITB 302ITB 302
ITB 302
Electronic Equipment
Electronic Equipment
Electronic Equipment
AEV S.P.A VIA DELLA TECNICA N.3 I-40050 ARGELATO BOLOGNA ITALY WWW.AEV.NET WWW.AEV-USA.COM E-MAIL: [e-mail]
Technical Data
AUDIO LEVELS
Input level (SEND 1/2) ±12dBm
Input impedance >10 KΩElectronically Balanced
Connector XLR female
Output level (RECEIVE 1/2) 0dBm
Output impedance 100 ΩElectronically Balanced (max load 600 Ω)
INSERT
Input level 0 dB
Input impedance >10KΩ
Insert Output level 0 dB
Head Output level +10 dB
Head Output impedance 10 Ω
Head Commentator 50 ΩUnbalanced
Connector Cannon 9 pole female
HYBRID CIRCUIT
Input/output balanced and floating.
Impedance 600 Ω
RX Level - 20 ÷ 0 dBm
TX Level - 8 dBm
Hybrid null - 40 dB Full Band (on urban telephon line)
Frequency response 230 ÷ 3400 Hz
Distortion 0.8 %

PAG. 15
ITB 302ITB 302
ITB 302ITB 302
ITB 302
Electronic Equipment
Electronic Equipment
Electronic Equipment
AEV S.P.A VIA DELLA TECNICA N.3 I-40050 ARGELATO BOLOGNA ITALY WWW.AEV.NET WWW.AEV-USA.COM E-MAIL: [e-mail]
4 WIRE SECTION
Impedance 600 Ω
RX Level - 12 ÷ + 12 dBm
TX Level 0dBm
Frequency responce 50 ÷ 20000 Hz (-1 dB)
Distorsion 0.8 %
Noise ≥74 dB (DIN Noise)
Crosstalk ≥75 dB (1KHz 0dBm)
MEETING SECTION
Connector 9-contact subminiature Cannon female
Input meeting ±12dBm
Input meeting impedance >10KΩ
Electronically Balanced
Connector 9-contact subminiature Cannon female
Output meeting 0 dB
Output meeting impedance 100 ΩElectronically Balanced
(max load 600 Ω)
GENERAL DATA
Power supply 87 to 254 V 50/60 Hz 10 VA
Dimension 19" Rackmount 1 Unity
Weight 4.0 Kg
Attention: All cables should not be more than 3 meters length.

PAG. 16 ITB 302ITB 302
ITB 302ITB 302
ITB 302
Electronic Equipment
Electronic Equipment
Electronic Equipment
AEV S.P.A VIA DELLA TECNICA N.3 I-40050 ARGELATO BOLOGNA ITALY WWW.AEV.NET WWW.AEV-USA.COM E-MAIL: [e-mail]
Connections
SEND: 1-GROUND
2-INPHASE
3-RETURN
RECEIVE: 1-GROUND
2-INPHASE
3-RETURN
INSERT: 1-MIC +
2-GND
3-IN SIGNAL (Insert)
4-GND
5-OUT SIGNAL +10 dB (Head)
6-MIC -
7-GND
8-GND
9-OUT SIGNAL 0 dB (Insert)
2 WIRE: 2-N.C.
3-TEL. SET / TEL. LINE
4-TEL. SET / TEL. LINE
5-N.C.
4 WIRE: 2-OUTPUT INPHASE
3-OUTPUT RETURN
4-INPUT INPHASE
5-INPUT RETURN
12
3
12
3

PAG. 17
ITB 302ITB 302
ITB 302ITB 302
ITB 302
Electronic Equipment
Electronic Equipment
Electronic Equipment
AEV S.P.A VIA DELLA TECNICA N.3 I-40050 ARGELATO BOLOGNA ITALY WWW.AEV.NET WWW.AEV-USA.COM E-MAIL: [e-mail]
Connections EXPANDERS / REMOTE
Expander 1
1- INPUT +
2-GND
3-INPUT -
4-OUTPUT +
5-GND
6-OUTPUT -
7-EXPANDER INPUT
8-GND
9-EXPANDER OUTPUT
Expander 2
1-N.C.
2-GND
3-N.C.
4-N.C.
5-GND
6-N.C.
7-EXPANDER INPUT
8-GND
9-EXPANDER OUTPUT
Remote
4 - Hook 2 (active low TTL input : internal pull-up 4K7)
16-Meeting 2 (active low TTL input : internal pull-up 4K7)
18-Hook 1 (active low TTL input : internal pull-up 4K7)
17-Meeting 1 (active low TTL input : internal pull-up 4K7)
12-Hook 2 (active low TTL output : 20 mA max)
11-Meeting 2 (active low TTL output : 20 mA max)
13-Hook 1 (active low TTL output : 20 mA max)
25-Meeting 1 (active low TTL output : 20 mA max)
6 - + 5 Volt (50 mA max)
19- + 5 Volt (50 mA max)
7 - + 5 Volt (50 mA max)
20- + 5 Volt (50 mA max)
21-GND
9-GND
22-GND
8-GND