Clear-Com TEL-14 User Manual
CLEAR-COM ECLIPSE
TEL-14 TWO-CHANNEL TELEPHONE INTERFACE
INSTRUCTION MANUAL
TEL-14 Two-Channel Telephone Interface Instruction Manual
© 2007 Vitec Group Communications Ltd. All rights reserved.
Part Number 810308Z Rev. 3
Vitec Group Communications, LLC.
850 Marina Village Parkway
Alameda, CA 94501
U.S.A
Vitec Group Communications
7400 Beach Drive
Cambridge Research Park
Cambridgeshire
United Kingdom
CB25 9TP
Vitec Group Communications
Room 1806, Hua Bin Building
No. 8 Yong An Dong Li
Jian Guo Men Wai Ave
Chao Yang District
Beijing, P.R. China 100022
® Clear-Com, CellCom/FreeSpeak and the Clear-Com Communication Systems logo are registered trademarks of The Vitec Group
plc.
CONTENTS
OPERATION 1-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
INSTALLATION 2-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
MAINTENANCE 3-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
SPECIFICATIONS 4-1
LIMITED WARRANTY 5-I
Warranty Period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-i
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-i
Warranty Repairs and Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii
Non-Warranty Repairs and Returns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii
Extended Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-ii
Liability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-iii
TEL-14 TWO-CHANNEL TELEPHONE INTERFACE
i
ii
TEL-14 TWO-CHANNEL TELEPHONE INTERFACE
Please read and follow these
instructions before operating
this product.
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves,
or other apparatus (including amplifiers) that produce heat.
9. Only use attachments/accessories specified by the manufacturer.
10. Use only with the cart, stand, tripod, bracket, or table specified by the
manufacturer, or sold with the apparatus. When a cart is used, use caution
when moving the cart/apparatus combination to avoid injury from tip-over.
11. Unplug this apparatus during lightning storms or when unused for long
periods of time.
12. Refer all servicing to qualified service personnel. Servicing is required when
the apparatus has been damaged in any way, such as power-supply cord or
plug is damaged, liquid has been spilled or objects have fallen into the
apparatus, the apparatus has been exposed to rain or moisture, does not
operate normally, or has been dropped.
13. WA RN I NG : To reduce the risk of fire or electric shock, do not expose this
product to rain or moisture.
Please familiarize yourself with the safety symbols in Figure 1. When you see
these symbols on this product, they warn you of the potential danger of electric
shock if the station is used improperly. They also refer you to important
operating and maintenance instructions in the manual.
TEL-14 TWO-CHANNEL TELEPHONE INTERFACE
iii
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
This symbol alerts you to the presence of uninsulated dangerous
voltage within the product's enclosure that might be of sufficient
magnitude to constitute a risk of electric shock. Do not open
the product's case.
This symbol informs you that important operating and maintenance instructions are included in the literature accompanying
this product.
Figure 1: Safety Symbols
EMC AND SAFETY
The TEL-14 Telephone Interface meets all relevant CE and FCC specifications
set out below:
EN55103-1 Electromagnetic compatibility. Product family standard for audio,
video, audio-visual, and entertainment lighting control apparatus for
professional use. Part 1: Emissions.
EN55103-2 Electromagnetic compatibility. Product family standard for audio,
video, audio-visual, and entertainment lighting control apparatus for
professional use. Part 2: Immunity.
And thereby compliance with the requirement of Electromagnetic
Compatibility Directive 2004/108/EC and Low Voltage Directive 2006/95/EC
This device complies with Part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
iv
TEL-14 TWO-CHANNEL TELEPHONE INTERFACE
1
OPERATION
INTRODUCTION
This chapter describes how to use the TEL-14 two-channel auto-nulling
telephone interface. The TEL-14's panel controls and internal option switches
can select any one of a large number of modes of operation. This chapter
describes the five most common modes:
• Intercom-station telephone access
•Self-service dial-in
This chapter describes the
five most common modes of
operation.
• Manual call screening
• Intercom-to-intercom
• Party-line dial-in
Intercom station operators will normally access telephone lines with the TEL-14
in the “intercom-station telephone-access” mode. However, station operators
may need to check with their system operator for further instructions if a
TEL-14 has been configured in a mode not described here.
Technical personnel should refer to Chapter 2, “Installation,” for details on
configuring the TEL-14's internal option switches for each of these modes (and
any others possible).
The next section, “Description,” covers the basic features of the TEL-14,
including its front-panel controls and indicators. The option switch settings are
described for each mode, but they are covered more thoroughly in Chapter 2.
The final sections cover the use of the TEL-14 in each of the five modes.
Important
automatic nulling process must be performed before it can be used. This
process consists of calling each line, depressing the Auto Answer button for 5
seconds, and then waiting several seconds while the automatic procedure is
carried out. It may not be possible to make outgoing calls on the telephone line
until this procedure is performed. Refer to the Automatic Telephone Line Null
section of this Operation Manual.
: When the TEL-14 is first connected to a new telephone line, its
Note: Other configurations are possible, in addition to the configurations described
here. However, certain configurations may result in undesirable crosstalk, as a result of
the limitations of the TEL-14's circuitry. For example, consider a news reporter who
calls into the matrix. You would like to provide the reporter with a program feed, and
at the same time route his voice in through the matrix to a live broadcast. However,
the TEL-14 cannot perfectly isolate his talk from his listen, so some of his outgoing
program feed may leak into his incoming voice.
TEL-14 TWO-CHANNEL TELEPHONE INTERFACE
1-1
Note: When using the TEL-14 with a speaker station, keep the panel mic gain low. In
general, keep all gain controls set to a level which is acceptable, but not excessive.
DESCRIPTION
The TEL-14 telephone interface can be installed in an IMF-3 or IMF-102
interface frame.
Install the TEL-14 in an
interface frame. See the
Interface Frames
Instruction Manual for
more information.
The TEL-14 allows two standard 2-wire POTS (Plain Old Telephone Service)
telephone lines to be connected to ports in the Eclipse matrix. The TEL-14 can
answer an incoming call automatically ("auto-answer") after either 1 or 4 rings,
and it can be configured to send a call signal whenever it answers a call. The
TEL-14 can be configured to be accessible to intercom station operators, or only
to outside callers.
The front panel features for each telephone line a "ring/off-hook" LED, a "hook"
button, a "send level" LED, a "send volume" control, a "receive volume" control,
an "auto gain adjustable" LED, an "auto gain" button, an "auto gain fixed" LED,
an "auto answer" LED, and an "auto answer" enable button. For more details see
the "Controls and Indicators" section, below.
The TEL-14 occupies one slot in an interface frame. The TEL-14 provides
transformer isolation between each telephone line and the matrix. The TEL-14
includes a "normally open" relay ("A" and "A1" contacts) for each line that closes
when the line is in use (off hook). Connections to the matrix are via RJ-45
connectors, and connections to the telephone line and external relay connections
are via DB-9M connectors. A secondary telephone set may be connected in series
with each TEL-14 line. Clear-Com provides DB-9F to RJ-11 adapters (CC#
770025) that allow the use of common RJ-11 telephone jacks and cords.
CONTROLS AND INDICATORS
1-2
The front panel features:
• A bicolor "ring/off-hook" status LED
• A "hook" ("line seize") button
• A bi-color "send level" LED
• A "send volume" control
• A "receive volume" control
• An "auto gain" button
• "Auto gain" status LEDs
• An "auto answer" button
• An "auto answer" status LED
TEL-14 TWO-CHANNEL TELEPHONE INTERFACE
"Ring/Off-Hook" LED
The "ring/off-hook" LED flashes red when the telephone line receives a ring
signal. The LED is green while the line is answered and in use. The LED flickers
yellow during the automatic hybrid nulling process. The LED is off when the
line is on-hook and not ringing.
"Hook" Button
The "hook" button allows a local operator to manually toggle the TEL-14 line
between "on-hook" (telephone line not in use) and "off-hook" (line "seized" -that is, in use) status. If a line is seized at the interface by the "hook" button, that
line cannot be released from an intercom station, even if the “matrix control”
option switch is set. The line can be released only by either pushing the button
again, or by auto-disconnect (if the auto-disconnect option switches are set).
"Send Level" LED
The bi-color "send level" LED lights green when the audio signal being sent to
the telephone line is at a typical acceptable level. The LED lights red when the
audio output signal level is too high. In normal operation, the LED should light
green during speech and only flicker red intermittently. The “send volume”
control adjusts the level indicated by this LED.
"Send Volume" Control
The "send volume" control sets the level of the signal that the TEL-14 sends to
the telephone line by changing the AGC limiting level. It is only active when the
"auto gain" button is set to “adjustable.” The "send volume" control has a r ange
of 12 dB. Adjust ± the "send" control so that the "send level" LED always lights
green with no more than occasional red flashes.
"Receive Volume" Control
The "receive volume" control sets the level of the signal that the TEL-14 receives
from the telephone line by changing the AGC limiting level. It is only active
when the "auto gain" button is set to “adjustable.” The "receiv e volume" control
has a range of 12 dB. While setting the receive volume, listen to the output from
the telephone line in normal use. Adjust the “receive” control until the telephone
receive level is comparable to the volume level of other intercom listen paths.
"Auto Gain" Button
With the "auto gain" button set to fixed, the TEL-14 adjusts the audio gain to
limit the send and receive telephone line signals to normal levels. In the fixed
mode, the "send volume" and "receive volume" controls are disabled, but are in
effect set to their center positions. When the "auto gain" button is set to
“adjustable,” the TEL-14 adjusts the audio gain to limit the send and receive
telephone line signals to levels defined by the "send volume" and "receive
volume" controls. The TEL-14 remembers the setting of the "auto gain" button
when power is turned off.
TEL-14 TWO-CHANNEL TELEPHONE INTERFACE
1-3
"Auto Gain" Status LEDs
These green and yellow LEDs indicate the currently selected “auto gain” mode.
The yellow LED indicates that the “adjustable” mode is selected and the green
LED indicates that the “fixed” mode is selected. Refer to the previous paragraph
for an explanation of these modes.
"Auto Answer" Button
The front-panel “auto answer” button allows the local user to enable or disable
the TEL-14's auto answering mode. The “auto answer” function, in conjunction
with the “auto disconnect” function, allows a TEL-14 to automatically service
incoming calls. An outside caller can automatically be connected to any matrix
audio connection that has been pre-assigned from the Eclipse Configuration
System, such as a party line or an IFB program feed.
Auto answer is enabled by using the "auto answer" button to turn ON the auto
answer indicator LED. The interface will then automatically answer incoming
calls after either 1 or 4 rings, as set by the "ring count" option switch. The
TEL-14 remembers the setting of the "auto answer" button when power is
turned off.
The “auto-answer” button can be overridden by the Eclipse matrix to allow the
TEL-14 to auto-answer without the auto-answer button being set to enable.
This will occur when a TEL-14 is configured in ECS to use Passcodes set up in
the System Preferences “System Access Codes” tab as DTMF Passcodes. The use
of DTMF passcodes is configured in Matrix Hardware under Advanced Settings
and DTMF Settings as “Enable Passwords”.
Once a line is auto answered, it can only be released by auto disconnect, by the
"hook" button, or from a matrix station that has "remote telephone-line release"
enabled. Auto disconnect releases the line when a dial tone, busy tone, reorder
tone, or loop current interruption appears on the line (if not disabled by the
auto-disconnect option switches). The line cannot be released by deactivating
any or all talk or listen paths from the intercom stations to the TEL-14. Flash
hook signals from the matrix will also have no effect. This prevents intercom
station operators from disconnecting the telephone line when it is in automatic
use by outside callers, or in manual use by an intercom station operator who has
access to the "hook" button.
The "auto answer" button can also be used to initiate an automatic nulling
sequence. Refer to the following section.
"Auto Answer" Status LED
This green LED indicates the currently selected “auto answer” mode. If it is lit,
the TEL-14 will automatically answer telephone calls. If it is not lit, incoming
telephone calls can only be answered manually. Refer to the previous paragraph
for further explanation of “auto answer” mode.
1-4
TEL-14 TWO-CHANNEL TELEPHONE INTERFACE
AUTOMATIC TELEPHONE LINE NULL
The TEL-14 features sophisticated automatic nulling circuitry, in addition to its
integral echo cancellation system. This nulling capability is in two parts:
• The initial telephone line hybrid null is to be performed the first time a
telephone line is connected to the TEL-14 or whenever a different telephone
line is connected. This process is automatic, but must be initiated by the user.
The way to do this is described later in this section.
• The continuous dynamic voice null takes place during each telephone call. It
automatically "fine tunes" the null and cancels echoes.
The TEL-14 must null itself to the telephone line before normal operation is
optimal. This procedure is to be performed once whenever the TEL-14 is
connected to a different telephone line. Once this nulling procedure is
performed, the TEL-14 will remember the telephone line characteristics when it
is removed from the frame or loses power. It is necessary to null (minimize) the
sidetone (the sound of the operator's own voice in his or her headset) when an
external telephone line is placed in an intercom environment. Ideally, there
should be no portion of the talk signal in the listen signal. The TEL-14's
sidetone nulling procedure is described here.
Before calling the TEL-14 to automatically null it, connect the external
telephone line and any other devices that affect the line's impedance. These
include other telephone extensions connected in parallel on the same line. The
phone line must be active (turned on at the central telephone office) during the
nulling process, and all local parallel phone sets must be plugged in but on-hook
so the line is in its normal operating state.
1. Enable the "auto answer" function using the front panel button.
2. Call the TEL-14 interface from a standard telephone set or cellular phone. Do
not call the TEL-14 from another TEL-14 in an intercom.
3. Press and hold the "auto answer" button for 5 seconds. The green "auto
answer on" LED will turn off and then turn on again after 5 seconds. When
this happens, release the "auto answer" button.
4. Maintain silence on the telephone line. The TEL-14 will listen for one second
of silence before beginning. The "ring/off-hook" LED will then flicker yellow
and a series of tones will appear on the telephone line. These tones will be
heard on the telephone line, but not on the intercom. Maintain silence during
this process.
5. At the conclusion of the tones, the automatic nulling process is complete.
After this initial automatic nulling adjustment has been made, the TEL-14 will
remain adapted to this telephone line. There will be no white noise or tones at
the beginning of each call, but instead the TEL-14 will use voices to dynamically
adapt the interface to account for any residual nulling which may be needed.
Typically, the TEL-14 will have adapted within 5 seconds of the start of the call.
Before it has adapted, voices may temporarily sound hollow. This effect is
normal, but may be minimized by reducing the send and/or receive volume
settings. Throughout the call the TEL-14 will continue to perform continuous,
automatic echo cancellation and adaptation to acoustic changes.
TEL-14 TWO-CHANNEL TELEPHONE INTERFACE
1-5
The above initial automatic nulling process should not need to be repeated,
unless the telephone line connection is changed to a different telephone number
or if there is reason to believe the telephone line impedance has changed
significantly--for example, if echoing or feedback occurs at a lower volume
setting than before.
OPERATION
This section describes the operation of the TEL-14 in each of the following
modes:
• Intercom-station telephone access
•Self-service dial-in
• Manual call screening
• Intercom-to-intercom
• Party-line dial-in
INTERCOM-STATION TELEPHONE-ACCESS MODE
In “intercom-station telephone-access” mode, a call on a TEL-14 line can be
answered by any intercom station with a selector key assigned to a TEL-14 port
label. Intercom stations can originate a call by using the "dial phone" mode.
If the call must originate at another station model, then this station must have a
key programmed to activate a DTMF sequence. Another way to arrange this is
for the operator to have access to a standard telephone set connected with the
TEL-14 line (for further information, see "Manual Call Screening Operation"
below).
The default settings of the TEL-14 allow “station access” mode.
If the “immediate manual disconnect” feature is disabled, there will be a period
of 15 seconds between the time when you deactivate the path to the TEL-14 port
and the time when the TEL-14 hangs up the line. This gives you time to transfer
the call to another station, or to recover an accidental deactivation of the path to
the TEL-14 without losing the call.
If your station is on the "preset call signal list" for the TEL-14 port, you will
automatically receive a call signal whenever the TEL-14 answers an incoming
telephone call. The call signal will continue for as long as the line is ringing.
SELF-SERVICE DIAL-IN MODE
In “self-service dial-in” mode, also referred to as "telephone IFB" mode, the
TEL-14 will answer automatically whenever outside callers dial in. The caller will
be automatically connected to a preset party-line, station, or program feed.
Auto-disconnect will release the line automatically after the caller hangs up. This
mode can also be used to implement "direct inward access" and "dial-up IFB".
This mode is normally configured to "prevent stations from calling out" to leave
the line available for dial-in use only.
1-6
TEL-14 TWO-CHANNEL TELEPHONE INTERFACE
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